style: rustfmt

fix(app): auto-scroll on iOS using scrollBy with integer accumulator
fix(app): chord overflow clip, section nav scroll on mobile
2026-07-11 22:58:00 +02:00 · 2026-07-11 22:54:17 +02:00 · 2026-07-11 22:49:05 +02:00 · 2026-07-11 22:39:46 +02:00 · 2026-07-11 22:37:11 +02:00 · 2026-07-11 22:30:59 +02:00
140 changed files with 17276 additions and 4268 deletions
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,5 +1,6 @@
 /target
-/app
+/app/node_modules
+/app/build
 .superpowers/
 .git/
 .claude/
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -0,0 +1,42 @@
+name: CI
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+
+env:
+  CARGO_TERM_COLOR: always
+  RUST_BACKTRACE: 1
+
+jobs:
+  ci:
+    name: Check / Test
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust stable
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+
+      - name: Cache cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: ${{ runner.os }}-cargo-
+
+      - name: fmt
+        run: cargo fmt --all -- --check
+
+      - name: clippy
+        run: cargo clippy --all-targets -- -D warnings
+
+      - name: test
+        run: cargo test
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,80 @@
+name: CI
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+
+env:
+  CARGO_TERM_COLOR: always
+  RUST_BACKTRACE: 1
+
+jobs:
+  ci:
+    name: Check / Test
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust stable
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+
+      - name: Cache cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: ${{ runner.os }}-cargo-
+
+      - name: fmt
+        run: cargo fmt --all -- --check
+
+      - name: clippy
+        run: cargo clippy --all-targets -- -D warnings
+
+      - name: test
+        run: cargo test
+
+  docker:
+    name: Build & Push Docker Image
+    runs-on: ubuntu-latest
+    needs: ci
+    if: github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/tags/v')
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GHCR_TOKEN || github.token }}
+
+      - name: Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha,prefix=
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,7 @@
 /target
 .env
-.superpowers/
+.superpowers/
+
+*.db
+*.db-shm
+*.db-wal
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -17,6 +17,15 @@ version = "0.2.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"

+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.102"
@@ -24,26 +33,35 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"

 [[package]]
-name = "api"
+name = "api-types"
 version = "0.1.0"
 dependencies = [
- "anyhow",
- "axum",
- "common",
- "domain",
- "persistence",
- "rand 0.10.0",
 "serde",
- "serde_json",
- "thiserror 2.0.18",
- "tokio",
- "tower-http",
+ "utoipa",
+]
+
+[[package]]
+name = "application"
+version = "0.1.0"
+dependencies = [
+ "chrono",
+ "domain",
 "tracing",
- "tracing-subscriber",
- "ug-parser",
 "uuid",
 ]

+[[package]]
+name = "argon2"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c3610892ee6e0cbce8ae2700349fcf8f98adb0dbfbee85aec3c9179d29cc072"
+dependencies = [
+ "base64ct",
+ "blake2",
+ "cpufeatures",
+ "password-hash",
+]
+
 [[package]]
 name = "async-trait"
 version = "0.1.89"
@@ -70,6 +88,20 @@ version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1505bd5d3d116872e7271a6d4e16d81d0c8570876c8de68093a09ac269d8aac0"

+[[package]]
+name = "auth"
+version = "0.1.0"
+dependencies = [
+ "argon2",
+ "async-trait",
+ "chrono",
+ "domain",
+ "jsonwebtoken",
+ "rand_core 0.6.4",
+ "serde",
+ "uuid",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.5.0"
@@ -183,6 +215,15 @@ dependencies = [
 "serde_core",
 ]

+[[package]]
+name = "blake2"
+version = "0.10.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "46502ad458c9a52b69d4d4d32775c788b7a1b85e8bc9d482d92250fc0e3f8efe"
+dependencies = [
+ "digest",
+]
+
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -241,14 +282,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "613afe47fcd5fac7ccf1db93babcb082c5994d996f20b8b159f2ad1658eb5724"

 [[package]]
-name = "chacha20"
-version = "0.10.0"
+name = "chrono"
+version = "0.4.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f8d983286843e49675a4b7a2d174efe136dc93a18d69130dd18198a6c167601"
+checksum = "1aa79e62e7697b8e29b513a68abacf485adcd1fe8284a4316c5ae868e6633327"
 dependencies = [
- "cfg-if",
- "cpufeatures 0.3.0",
- "rand_core 0.10.0",
+ "iana-time-zone",
+ "js-sys",
+ "num-traits",
+ "serde",
+ "wasm-bindgen",
+ "windows-link",
 ]

 [[package]]
@@ -270,23 +314,6 @@ dependencies = [
 "memchr",
 ]

-[[package]]
-name = "common"
-version = "0.1.0"
-dependencies = [
- "anyhow",
- "async-trait",
- "domain",
- "rand 0.10.0",
- "reqwest",
- "serde",
- "serde_json",
- "thiserror 2.0.18",
- "tokio",
- "tracing",
- "uuid",
-]
-
 [[package]]
 name = "concurrent-queue"
 version = "2.5.0"
@@ -337,15 +364,6 @@ dependencies = [
 "libc",
 ]

-[[package]]
-name = "cpufeatures"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b2a41393f66f16b0823bb79094d54ac5fbd34ab292ddafb9a0456ac9f87d201"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "crc"
 version = "3.4.0"
@@ -420,6 +438,12 @@ dependencies = [
 "zeroize",
 ]

+[[package]]
+name = "deranged"
+version = "0.5.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7cd812cc2bc1d69d4764bd80df88b4317eaef9e773c75226407d9bc0876b211c"
+
 [[package]]
 name = "derive_more"
 version = "0.99.20"
@@ -458,12 +482,11 @@ dependencies = [
 name = "domain"
 version = "0.1.0"
 dependencies = [
- "anyhow",
 "async-trait",
- "rand 0.10.0",
+ "chrono",
+ "email_address",
 "serde",
 "thiserror 2.0.18",
- "tracing",
 "uuid",
 ]

@@ -509,6 +532,15 @@ dependencies = [
 "serde",
 ]

+[[package]]
+name = "email_address"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e079f19b08ca6239f47f8ba8509c11cf3ea30095831f7fed61441475edd8c449"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "encoding_rs"
 version = "0.8.35"
@@ -745,7 +777,6 @@ dependencies = [
 "cfg-if",
 "libc",
 "r-efi 6.0.0",
- "rand_core 0.10.0",
 "wasip2",
 "wasip3",
 ]
@@ -960,6 +991,30 @@ dependencies = [
 "windows-registry",
 ]

+[[package]]
+name = "iana-time-zone"
+version = "0.1.65"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e31bc9ad994ba00e440a8aa5c9ef0ec67d5cb5e5cb0cc7f8b744a35b389cc470"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "log",
+ "wasm-bindgen",
+ "windows-core",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "icu_collections"
 version = "2.2.0"
@@ -1081,6 +1136,10 @@ dependencies = [
 "serde_core",
 ]

+[[package]]
+name = "infra-wiring"
+version = "0.1.0"
+
 [[package]]
 name = "ipnet"
 version = "2.12.0"
@@ -1169,6 +1228,21 @@ dependencies = [
 "wasm-bindgen",
 ]

+[[package]]
+name = "jsonwebtoken"
+version = "9.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a87cc7a48537badeae96744432de36f4be2b4a34a05a5ef32e9dd8a1c169dde"
+dependencies = [
+ "base64",
+ "js-sys",
+ "pem",
+ "ring",
+ "serde",
+ "serde_json",
+ "simple_asn1",
+]
+
 [[package]]
 name = "lazy_static"
 version = "1.5.0"
@@ -1350,6 +1424,16 @@ dependencies = [
 "windows-sys 0.61.2",
 ]

+[[package]]
+name = "num-bigint"
+version = "0.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c89e69e7e0f03bea5ef08013795c25018e101932225a656383bd384495ecc367"
+dependencies = [
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-bigint-dig"
 version = "0.8.6"
@@ -1366,6 +1450,12 @@ dependencies = [
 "zeroize",
 ]

+[[package]]
+name = "num-conv"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "521739c6d2bac4aa25192232afe6841231376b2b26d4d9fae5ecf8ca5772e441"
+
 [[package]]
 name = "num-integer"
 version = "0.1.46"
@@ -1437,6 +1527,27 @@ dependencies = [
 "windows-link",
 ]

+[[package]]
+name = "password-hash"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "346f04948ba92c43e8469c1ee6736c7563d71012b17d40745260fe106aac2166"
+dependencies = [
+ "base64ct",
+ "rand_core 0.6.4",
+ "subtle",
+]
+
+[[package]]
+name = "pem"
+version = "3.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d30c53c26bc5b31a98cd02d20f25a7c8567146caf63ed593a9d87b2775291be"
+dependencies = [
+ "base64",
+ "serde_core",
+]
+
 [[package]]
 name = "pem-rfc7468"
 version = "0.7.0"
@@ -1452,23 +1563,6 @@ version = "2.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"

-[[package]]
-name = "persistence"
-version = "0.1.0"
-dependencies = [
- "anyhow",
- "async-trait",
- "common",
- "domain",
- "rand 0.10.0",
- "serde_json",
- "sqlx",
- "thiserror 2.0.18",
- "tokio",
- "tracing",
- "uuid",
-]
-
 [[package]]
 name = "phf"
 version = "0.11.3"
@@ -1569,6 +1663,12 @@ dependencies = [
 "zerovec",
 ]

+[[package]]
+name = "powerfmt"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "439ee305def115ba05938db6eb1644ff94165c5ab5e9420d1c1bcedbba909391"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.21"
@@ -1584,6 +1684,29 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"

+[[package]]
+name = "presentation"
+version = "0.1.0"
+dependencies = [
+ "api-types",
+ "application",
+ "async-trait",
+ "auth",
+ "axum",
+ "domain",
+ "infra-wiring",
+ "serde",
+ "sqlite",
+ "tokio",
+ "tower-http",
+ "tracing",
+ "tracing-subscriber",
+ "ug-parser",
+ "utoipa",
+ "utoipa-scalar",
+ "uuid",
+]
+
 [[package]]
 name = "prettyplease"
 version = "0.2.37"
@@ -1701,17 +1824,6 @@ dependencies = [
 "rand_core 0.9.5",
 ]

-[[package]]
-name = "rand"
-version = "0.10.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc266eb313df6c5c09c1c7b1fbe2510961e5bcd3add930c1e31f7ed9da0feff8"
-dependencies = [
- "chacha20",
- "getrandom 0.4.2",
- "rand_core 0.10.0",
-]
-
 [[package]]
 name = "rand_chacha"
 version = "0.3.1"
@@ -1750,12 +1862,6 @@ dependencies = [
 "getrandom 0.3.4",
 ]

-[[package]]
-name = "rand_core"
-version = "0.10.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c8d0fd677905edcbeedbf2edb6494d676f0e98d54d5cf9bda0b061cb8fb8aba"
-
 [[package]]
 name = "redox_syscall"
 version = "0.5.18"
@@ -1774,6 +1880,18 @@ dependencies = [
 "bitflags",
 ]

+[[package]]
+name = "regex"
+version = "1.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e10754a14b9137dd7b1e3e5b0493cc9171fdd105e0ab477f51b72e7f3ac0e276"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
 [[package]]
 name = "regex-automata"
 version = "0.4.14"
@@ -2126,7 +2244,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3bf829a2d51ab4a5ddf1352d8470c140cadc8301b2ae1789db023f01cedd6ba"
 dependencies = [
 "cfg-if",
- "cpufeatures 0.2.17",
+ "cpufeatures",
 "digest",
 ]

@@ -2137,7 +2255,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a7507d819769d01a365ab707794a4084392c824f54a7a6a7862f8c3d0892b283"
 dependencies = [
 "cfg-if",
- "cpufeatures 0.2.17",
+ "cpufeatures",
 "digest",
 ]

@@ -2176,6 +2294,18 @@ dependencies = [
 "rand_core 0.6.4",
 ]

+[[package]]
+name = "simple_asn1"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0d585997b0ac10be3c5ee635f1bab02d512760d14b7c468801ac8a01d9ae5f1d"
+dependencies = [
+ "num-bigint",
+ "num-traits",
+ "thiserror 2.0.18",
+ "time",
+]
+
 [[package]]
 name = "siphasher"
 version = "1.0.2"
@@ -2226,6 +2356,18 @@ dependencies = [
 "der",
 ]

+[[package]]
+name = "sqlite"
+version = "0.1.0"
+dependencies = [
+ "async-trait",
+ "chrono",
+ "domain",
+ "serde_json",
+ "sqlx",
+ "uuid",
+]
+
 [[package]]
 name = "sqlx"
 version = "0.8.6"
@@ -2580,6 +2722,36 @@ dependencies = [
 "cfg-if",
 ]

+[[package]]
+name = "time"
+version = "0.3.53"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "18dfaaeddcb932337b5e7866ee7d0ce9b76d2fd092997146f187ec09b4558a50"
+dependencies = [
+ "deranged",
+ "num-conv",
+ "powerfmt",
+ "serde_core",
+ "time-core",
+ "time-macros",
+]
+
+[[package]]
+name = "time-core"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e1c906769ad99c88eaa54e728060edef082f8e358ff32030cb7c7d315e81109"
+
+[[package]]
+name = "time-macros"
+version = "0.2.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c431b87111666e491a90baa837f914fb45cd5dc3c268591b0220ff5057f2085f"
+dependencies = [
+ "num-conv",
+ "time-core",
+]
+
 [[package]]
 name = "tinystr"
 version = "0.8.3"
@@ -2801,12 +2973,10 @@ checksum = "562d481066bde0658276a35467c4af00bdc6ee726305698a55b86e61d7ad82bb"
 name = "ug-parser"
 version = "0.1.0"
 dependencies = [
- "anyhow",
 "async-trait",
 "domain",
 "reqwest",
 "scraper",
- "thiserror 2.0.18",
 "tokio",
 ]

@@ -2885,6 +3055,42 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6c140620e7ffbb22c2dee59cafe6084a59b5ffc27a8859a5f0d494b5d52b6be"

+[[package]]
+name = "utoipa"
+version = "5.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8bde15df68e80b16c7d16b9616e80770ad158988daa56a27dccd1e55558b0160"
+dependencies = [
+ "indexmap",
+ "serde",
+ "serde_json",
+ "utoipa-gen",
+]
+
+[[package]]
+name = "utoipa-gen"
+version = "5.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ba0b99ee52df3028635d93840c797102da61f8a7bb3cf751032455895b52ef8"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "regex",
+ "syn",
+]
+
+[[package]]
+name = "utoipa-scalar"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59559e1509172f6b26c1cdbc7247c4ddd1ac6560fe94b584f81ee489b141f719"
+dependencies = [
+ "axum",
+ "serde",
+ "serde_json",
+ "utoipa",
+]
+
 [[package]]
 name = "uuid"
 version = "1.23.0"
@@ -3119,6 +3325,41 @@ dependencies = [
 "windows-sys 0.61.2",
 ]

+[[package]]
+name = "windows-core"
+version = "0.62.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8e83a14d34d0623b51dce9581199302a221863196a1dde71a7663a4c2be9deb"
+dependencies = [
+ "windows-implement",
+ "windows-interface",
+ "windows-link",
+ "windows-result",
+ "windows-strings",
+]
+
+[[package]]
+name = "windows-implement"
+version = "0.60.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "windows-interface"
+version = "0.59.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,29 +1,42 @@
 [workspace]
 members = [
-    "crates/api",
-    "crates/common",
+    "crates/adapters/auth",
+    "crates/adapters/sqlite",
+    "crates/adapters/ug-parser",
+    "crates/api-types",
+    "crates/application",
    "crates/domain",
-    "crates/infrastructure/persistence",
-    "crates/infrastructure/ug-parser",
+    "crates/infra-wiring",
+    "crates/presentation",
 ]
 resolver = "2"

 [workspace.dependencies]
-anyhow = "1.0.102"
-reqwest = "0.13.2"
+tokio = { version = "1.51.0", features = ["full"] }
 serde = { version = "1.0.228", features = ["derive"] }
 serde_json = "1.0.149"
+anyhow = "1.0.102"
 thiserror = "2.0.18"
-tokio = { version = "1.51.0", features = ["full"] }
 tracing = "0.1.44"
 tracing-subscriber = { version = "0.3.23", features = ["env-filter"] }
+async-trait = "0.1.89"
 uuid = { version = "1.23.0", features = ["v4", "serde"] }
 rand = "0.10.0"
-sqlx = { version = "0.8.6", features = ["runtime-tokio-rustls", "sqlite", "uuid", "macros"] }
-async-trait = "0.1.89"
+reqwest = "0.13.2"
 scraper = "0.23"
+sqlx = { version = "0.8.6", features = ["runtime-tokio-rustls", "sqlite", "uuid", "macros"] }
+axum = { version = "0.8.8", features = ["macros"] }
+
+domain = { path = "crates/domain" }
+application = { path = "crates/application" }
+api-types = { path = "crates/api-types" }
+infra-wiring = { path = "crates/infra-wiring" }
+auth = { path = "crates/adapters/auth" }
+sqlite = { path = "crates/adapters/sqlite" }
+ug-parser = { path = "crates/adapters/ug-parser" }

 [profile.release]
 strip = true
 codegen-units = 1
 opt-level = 3
+lto = true
--- a/24
+++ b/24
@@ -1,30 +1,36 @@
-FROM rust:1.92 AS builder
+FROM node:22-slim AS frontend
+
+WORKDIR /app/frontend
+COPY app/package.json app/package-lock.json ./
+RUN npm ci
+COPY app/ .
+ENV VITE_API_URL=/api
+RUN npm run build
+
+FROM rust:1.97 AS backend

 WORKDIR /app
 COPY . .
-
-# Build the release binary
-RUN cargo build --release -p api
+RUN cargo build --release -p presentation

 FROM debian:trixie-slim

 WORKDIR /app

-# Install OpenSSL, CA certs
 RUN apt-get update && apt-get install -y --no-install-recommends \
    libssl3 \
    ca-certificates \
    libsqlite3-0 \
    && rm -rf /var/lib/apt/lists/*

-COPY --from=builder /app/target/release/api .
+COPY --from=backend /app/target/release/presentation .
+COPY --from=frontend /app/frontend/build/client ./spa

-
-# Create data directory for SQLite
 RUN mkdir -p /app/data

 ENV DATABASE_URL=sqlite:///app/data/pocket-chords.db
+ENV SPA_DIR=/app/spa

 EXPOSE 8000

-CMD ["./api"]
+CMD ["./presentation"]
--- a/22
+++ b/22
@@ -1 +1,21 @@
-MIT
+MIT License
+
+Copyright (c) 2026 Gabriel Kaszewski
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
--- a/44
+++ b/44
@@ -0,0 +1,44 @@
+.DEFAULT_GOAL := check
+
+# Run the full local check suite — same order as CI would.
+check: fmt-check clippy test
+	@echo "✅ All checks passed"
+
+# Apply rustfmt to all files.
+fmt:
+	cargo fmt
+
+# Check formatting without modifying files (CI-safe).
+fmt-check:
+	cargo fmt --check
+
+# Run Clippy and treat warnings as errors.
+clippy:
+	cargo clippy -- -D warnings
+
+# Run the test suite.
+test:
+	cargo test
+
+# Apply fmt + clippy auto-fixes in one shot.
+fix:
+	cargo fmt
+	cargo clippy --fix --allow-dirty --allow-staged
+
+# Build the frontend SPA.
+build-app:
+	cd app && npm run build
+
+# Run the backend (builds frontend first if needed).
+dev: build-app
+	JWT_SECRET=dev-secret ALLOW_REGISTRATION=true cargo run -p presentation
+
+# Run backend only (skip frontend build, assumes build-app was run).
+dev-api:
+	JWT_SECRET=dev-secret ALLOW_REGISTRATION=true cargo run -p presentation
+
+# Build and push Docker image to private registry.
+deploy:
+	./deploy.sh
+
+.PHONY: check fmt fmt-check clippy test fix build-app dev dev-api deploy
--- a/README.md
+++ b/README.md
@@ -1,3 +1,79 @@
 # PocketChords

-A rip-off of [TabsUltimate](https://www.tabultimateguitar.com/) with a focus on mobile users, without any ads or subscription. It is open source and free to use.
+A rip-off of [Ultimate Guitar](https://www.ultimate-guitar.com/) with a focus on mobile users, without any ads or subscription. Self-hosted, open source and free to use.
+
+## Features
+
+- Import chord sheets from Ultimate Guitar URLs or HTML files (bulk import supported)
+- Transpose chords up/down with one tap
+- Piano keyboard and guitar fretboard chord diagrams
+- Capo support with sounding-key display
+- Adjustable font size (S/M/L) for readability while playing
+- Search and sort your library
+- Dark/light theme
+- PWA — add to home screen for native feel
+- JWT auth with registration/login
+- OpenAPI docs at `/docs`
+
+## Architecture
+
+Hexagonal / ports-and-adapters with CQRS in the application layer. See `architecture.mmd` for the full diagram.
+
+```
+crates/
+  domain/           # entities, value objects, ports, domain services
+  application/      # use cases: songs/, tabs/, auth/ (commands, queries, deps)
+  presentation/     # axum HTTP server, routes, extractors, OpenAPI
+  api-types/        # request/response DTOs
+  infra-wiring/     # shared config (AppConfig)
+  adapters/
+    sqlite/          # SQLite persistence (songs, users, refresh sessions)
+    ug-parser/       # Ultimate Guitar HTML parser
+    auth/            # JWT + Argon2 password hashing
+app/                 # React Router SPA (Tailwind, shadcn/ui)
+```
+
+## Quick start
+
+```bash
+# prerequisites: rust, node
+
+# run locally (builds frontend, starts backend on :8000)
+make dev
+
+# or backend only (if frontend already built)
+make dev-api
+
+# run checks (fmt, clippy, tests)
+make check
+```
+
+## Deployment
+
+Single Docker image serves both API and SPA:
+
+```bash
+# build and push to private registry
+make deploy
+
+# or with a specific tag
+./deploy.sh --tag v1.0.0
+```
+
+### Environment variables
+
+| Variable               | Default                       | Description                    |
+| ---------------------- | ----------------------------- | ------------------------------ |
+| `DATABASE_URL`         | `sqlite://./pocket-chords.db` | SQLite connection string       |
+| `HOST`                 | `0.0.0.0`                     | Bind address                   |
+| `PORT`                 | `8000`                        | Bind port                      |
+| `JWT_SECRET`           | _(required)_                  | Secret for signing JWTs        |
+| `JWT_TTL_SECONDS`      | `900`                         | Access token TTL (15 min)      |
+| `REFRESH_TTL_SECONDS`  | `2592000`                     | Refresh token TTL (30 days)    |
+| `ALLOW_REGISTRATION`   | `false`                       | Enable user registration       |
+| `CORS_ALLOWED_ORIGINS` | `*`                           | Comma-separated origins or `*` |
+| `SPA_DIR`              | `./app/build/client`          | Path to SPA static files       |
+
+## License
+
+MIT (see [LICENSE](LICENSE) for details).
--- a/app/.env.example
+++ b/app/.env.example
@@ -1 +1 @@
-VITE_API_URL=http://localhost:8000
+VITE_API_URL=/api
--- a/app/README.md
+++ b/app/README.md
@@ -1,87 +1,32 @@
-# Welcome to React Router!
+# PocketChords — Frontend

-A modern, production-ready template for building full-stack React applications using React Router.
+React Router v7 SPA with Tailwind CSS and shadcn/ui. Mobile-first design for viewing chord charts while playing.

-[![Open in StackBlitz](https://developer.stackblitz.com/img/open_in_stackblitz.svg)](https://stackblitz.com/github/remix-run/react-router-templates/tree/main/default)
-
-## Features
-
- 🚀 Server-side rendering
- ⚡️ Hot Module Replacement (HMR)
- 📦 Asset bundling and optimization
- 🔄 Data loading and mutations
- 🔒 TypeScript by default
- 🎉 TailwindCSS for styling
- 📖 [React Router docs](https://reactrouter.com/)
-
-## Getting Started
-
-### Installation
-
-Install the dependencies:
+## Setup

 ```bash
 npm install
 ```

-### Development
-
-Start the development server with HMR:
+## Development

 ```bash
 npm run dev
 ```

-Your application will be available at `http://localhost:5173`.
+Opens at `http://localhost:5173`. Set `VITE_API_URL` in `.env` to point to the backend (defaults to `/api`).

-## Building for Production
-
-Create a production build:
+## Build

 ```bash
 npm run build
 ```

-## Deployment
+Outputs static files to `build/client/`. The Rust backend serves these in production.

-### Docker Deployment
+## Stack

-To build and run using Docker:
-
-```bash
-docker build -t my-app .
-
-# Run the container
-docker run -p 3000:3000 my-app
-```
-
-The containerized application can be deployed to any platform that supports Docker, including:
-
- AWS ECS
- Google Cloud Run
- Azure Container Apps
- Digital Ocean App Platform
- Fly.io
- Railway
-
-### DIY Deployment
-
-If you're familiar with deploying Node applications, the built-in app server is production-ready.
-
-Make sure to deploy the output of `npm run build`
-
-```
-├── package.json
-├── package-lock.json (or pnpm-lock.yaml, or bun.lockb)
-├── build/
-│   ├── client/    # Static assets
-│   └── server/    # Server-side code
-```
-
-## Styling
-
-This template comes with [Tailwind CSS](https://tailwindcss.com/) already configured for a simple default starting experience. You can use whatever CSS framework you prefer.
-
---
-
-Built with ❤️ using React Router.
+- React 19 + React Router 7 (SPA mode)
+- Tailwind CSS 4 + shadcn/ui
+- Tonal (music theory / chord voicings)
+- Vite
--- a/app/app/components/auto-scroll-controls.tsx
+++ b/app/app/components/auto-scroll-controls.tsx
@@ -0,0 +1,114 @@
+import { useCallback, useEffect, useRef, useState } from "react";
+import { Pause, Play } from "lucide-react";
+import { Button } from "~/components/ui/button";
+import { Slider } from "~/components/ui/slider";
+
+interface Props {
+  scrollRef: React.RefObject<HTMLDivElement | null>;
+}
+
+function loadSpeed(): number {
+  try {
+    const v = localStorage.getItem("autoScrollSpeed");
+    if (v) return parseFloat(v);
+  } catch {
+    /* noop */
+  }
+  return 30;
+}
+
+export function AutoScrollControls({ scrollRef }: Props) {
+  const [playing, setPlaying] = useState(false);
+  const [speed, setSpeed] = useState(loadSpeed);
+  const rafRef = useRef<number>(0);
+  const lastTimeRef = useRef<number>(0);
+  const cancelledByUser = useRef(false);
+
+  const accumulatorRef = useRef(0);
+
+  const tick = useCallback(
+    (time: number) => {
+      const el = scrollRef.current;
+      if (!el) return;
+      if (lastTimeRef.current) {
+        const dt = (time - lastTimeRef.current) / 1000;
+        accumulatorRef.current += speed * dt;
+        const px = Math.floor(accumulatorRef.current);
+        if (px >= 1) {
+          accumulatorRef.current -= px;
+          el.scrollBy({ top: px });
+        }
+
+        if (el.scrollTop + el.clientHeight >= el.scrollHeight - 1) {
+          setPlaying(false);
+          return;
+        }
+      }
+      lastTimeRef.current = time;
+      rafRef.current = requestAnimationFrame(tick);
+    },
+    [scrollRef, speed],
+  );
+
+  useEffect(() => {
+    if (playing) {
+      lastTimeRef.current = 0;
+      accumulatorRef.current = 0;
+      cancelledByUser.current = false;
+      rafRef.current = requestAnimationFrame(tick);
+    } else {
+      cancelAnimationFrame(rafRef.current);
+    }
+    return () => cancelAnimationFrame(rafRef.current);
+  }, [playing, tick]);
+
+  useEffect(() => {
+    const el = scrollRef.current;
+    if (!el) return;
+
+    function handleUserScroll() {
+      if (playing && !cancelledByUser.current) {
+        cancelledByUser.current = true;
+        setPlaying(false);
+      }
+    }
+
+    el.addEventListener("touchstart", handleUserScroll, { passive: true });
+    return () => el.removeEventListener("touchstart", handleUserScroll);
+  }, [scrollRef, playing]);
+
+  function handleSpeedChange(value: number[]) {
+    const v = value[0];
+    setSpeed(v);
+    try {
+      localStorage.setItem("autoScrollSpeed", String(v));
+    } catch {
+      /* noop */
+    }
+  }
+
+  return (
+    <div className="flex items-center gap-2 px-3 py-1 shrink-0">
+      <Button
+        variant="ghost"
+        size="icon"
+        className="h-7 w-7 shrink-0"
+        onClick={() => setPlaying((p) => !p)}
+      >
+        {playing ? (
+          <Pause className="w-3.5 h-3.5" />
+        ) : (
+          <Play className="w-3.5 h-3.5" />
+        )}
+      </Button>
+      <Slider
+        min={10}
+        max={80}
+        step={5}
+        value={[speed]}
+        onValueChange={handleSpeedChange}
+        className="w-24"
+      />
+    </div>
+  );
+}
--- a/app/app/components/bottom-nav.tsx
+++ b/app/app/components/bottom-nav.tsx
@@ -1,45 +1,104 @@
+import { useState } from "react";
 import { NavLink } from "react-router";
-import { Music, Sun, Moon } from "lucide-react";
+import { LogOut, Music, Sun, Moon, User } from "lucide-react";
 import { useTheme } from "next-themes";
 import { cn } from "~/lib/utils";
 import { Button } from "~/components/ui/button";
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuTrigger,
+} from "~/components/ui/dropdown-menu";
+import { useAuth } from "~/lib/auth";
+import { LoginSheet } from "~/components/login-sheet";
+import { RegisterSheet } from "~/components/register-sheet";

 export function BottomNav() {
  const { resolvedTheme, setTheme } = useTheme();
+  const { isAuthenticated, logout } = useAuth();
+  const [loginOpen, setLoginOpen] = useState(false);
+  const [registerOpen, setRegisterOpen] = useState(false);

  return (
-    <nav className="border-t bg-background shrink-0">
-      <div className="max-w-lg mx-auto flex items-center">
-        <NavLink
-          to="/"
-          end
-          className={({ isActive }) =>
-            cn(
-              "flex flex-col items-center gap-0.5 flex-1 py-2 text-xs transition-colors",
-              isActive
-                ? "text-primary"
-                : "text-muted-foreground hover:text-foreground"
-            )
-          }
-        >
-          <Music className="w-5 h-5" />
-          <span>Library</span>
-        </NavLink>
+    <>
+      <nav className="border-t bg-background shrink-0">
+        <div className="max-w-lg mx-auto flex items-center">
+          <NavLink
+            to="/"
+            end
+            className={({ isActive }) =>
+              cn(
+                "flex flex-col items-center gap-0.5 flex-1 py-2 text-xs transition-colors",
+                isActive
+                  ? "text-primary"
+                  : "text-muted-foreground hover:text-foreground",
+              )
+            }
+          >
+            <Music className="w-5 h-5" />
+            <span>Library</span>
+          </NavLink>

-        <Button
-          variant="ghost"
-          size="icon"
-          className="mr-2 text-muted-foreground hover:text-foreground"
-          onClick={() => setTheme(resolvedTheme === "dark" ? "light" : "dark")}
-          aria-label="Toggle theme"
-        >
-          {resolvedTheme === "dark" ? (
-            <Sun className="w-5 h-5" />
-          ) : (
-            <Moon className="w-5 h-5" />
-          )}
-        </Button>
-      </div>
-    </nav>
+          <div className="flex items-center gap-1 mr-2">
+            <Button
+              variant="ghost"
+              size="icon"
+              className="text-muted-foreground hover:text-foreground"
+              onClick={() =>
+                setTheme(resolvedTheme === "dark" ? "light" : "dark")
+              }
+              aria-label="Toggle theme"
+            >
+              {resolvedTheme === "dark" ? (
+                <Sun className="w-5 h-5" />
+              ) : (
+                <Moon className="w-5 h-5" />
+              )}
+            </Button>
+
+            {isAuthenticated ? (
+              <DropdownMenu>
+                <DropdownMenuTrigger asChild>
+                  <Button
+                    variant="ghost"
+                    size="icon"
+                    className="text-muted-foreground hover:text-foreground"
+                  >
+                    <User className="w-5 h-5" />
+                  </Button>
+                </DropdownMenuTrigger>
+                <DropdownMenuContent align="end">
+                  <DropdownMenuItem onClick={() => logout()}>
+                    <LogOut className="w-4 h-4 mr-2" />
+                    Sign out
+                  </DropdownMenuItem>
+                </DropdownMenuContent>
+              </DropdownMenu>
+            ) : (
+              <Button
+                variant="ghost"
+                size="sm"
+                className="text-xs text-muted-foreground hover:text-foreground"
+                onClick={() => setLoginOpen(true)}
+              >
+                Sign in
+              </Button>
+            )}
+          </div>
+        </div>
+      </nav>
+
+      <LoginSheet
+        open={loginOpen}
+        onOpenChange={setLoginOpen}
+        onSwitchToRegister={() => setRegisterOpen(true)}
+      />
+      <RegisterSheet
+        open={registerOpen}
+        onOpenChange={setRegisterOpen}
+        onSwitchToLogin={() => setLoginOpen(true)}
+      />
+    </>
  );
 }
--- a/app/app/components/chord-chart.tsx
+++ b/app/app/components/chord-chart.tsx
@@ -45,7 +45,7 @@ function ChordRow({
  onChordClick?: (chord: string) => void;
 }) {
  return (
-    <div className={`relative font-mono ${sizeClass} text-primary`} style={{ height: '1.5em' }}>
+    <div className={`relative font-mono ${sizeClass} text-primary overflow-hidden`} style={{ height: '1.5em' }}>
      {chords.map(({ offset, chord }, i) => (
        <span
          key={i}
@@ -85,15 +85,17 @@ function LineBlock({

 function SectionBlock({
  section,
+  index,
  sizeClass,
  onChordClick,
 }: {
  section: Section;
+  index: number;
  sizeClass: string;
  onChordClick?: (chord: string) => void;
 }) {
  return (
-    <div className="mb-6">
+    <div className="mb-6" id={`section-${index}`}>
      {section.label && (
        <p className="text-xs text-muted-foreground mb-1">[{section.label}]</p>
      )}
@@ -111,7 +113,7 @@ export function ChordChart({ sections, fontSize, onChordClick }: Props) {
  return (
    <div className="px-4 py-3">
      {sections.map((section, i) => (
-        <SectionBlock key={i} section={section} sizeClass={sizeClass} onChordClick={onChordClick} />
+        <SectionBlock key={i} section={section} index={i} sizeClass={sizeClass} onChordClick={onChordClick} />
      ))}
    </div>
  );
--- a/app/app/components/login-sheet.tsx
+++ b/app/app/components/login-sheet.tsx
@@ -0,0 +1,91 @@
+import { useState } from "react";
+import {
+  Sheet,
+  SheetContent,
+  SheetHeader,
+  SheetTitle,
+} from "~/components/ui/sheet";
+import { Input } from "~/components/ui/input";
+import { Label } from "~/components/ui/label";
+import { Button } from "~/components/ui/button";
+import { useAuth } from "~/lib/auth";
+import { toast } from "sonner";
+
+interface Props {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+  onSwitchToRegister: () => void;
+}
+
+export function LoginSheet({ open, onOpenChange, onSwitchToRegister }: Props) {
+  const { login } = useAuth();
+  const [email, setEmail] = useState("");
+  const [password, setPassword] = useState("");
+  const [loading, setLoading] = useState(false);
+
+  async function handleSubmit(e: React.FormEvent) {
+    e.preventDefault();
+    setLoading(true);
+    try {
+      await login(email, password);
+      onOpenChange(false);
+      setEmail("");
+      setPassword("");
+      toast.success("Logged in");
+    } catch (err) {
+      toast.error(err instanceof Error ? err.message : "Login failed");
+    } finally {
+      setLoading(false);
+    }
+  }
+
+  return (
+    <Sheet open={open} onOpenChange={onOpenChange}>
+      <SheetContent side="bottom" className="rounded-t-xl">
+        <SheetHeader>
+          <SheetTitle>Sign in</SheetTitle>
+        </SheetHeader>
+        <form onSubmit={handleSubmit} className="flex flex-col gap-4 px-4 pb-6">
+          <div className="flex flex-col gap-2">
+            <Label htmlFor="login-email">Email</Label>
+            <Input
+              id="login-email"
+              type="email"
+              autoComplete="email"
+              placeholder="you@example.com"
+              value={email}
+              onChange={(e) => setEmail(e.target.value)}
+              required
+            />
+          </div>
+          <div className="flex flex-col gap-2">
+            <Label htmlFor="login-password">Password</Label>
+            <Input
+              id="login-password"
+              type="password"
+              autoComplete="current-password"
+              placeholder="********"
+              value={password}
+              onChange={(e) => setPassword(e.target.value)}
+              required
+            />
+          </div>
+          <Button type="submit" disabled={loading} className="w-full">
+            {loading ? "Signing in..." : "Sign in"}
+          </Button>
+          <Button
+            type="button"
+            variant="ghost"
+            className="w-full text-sm text-muted-foreground"
+            onClick={() => {
+              onOpenChange(false);
+              onSwitchToRegister();
+            }}
+          >
+            Don't have an account? Register
+          </Button>
+        </form>
+      </SheetContent>
+    </Sheet>
+  );
+}
--- a/app/app/components/register-sheet.tsx
+++ b/app/app/components/register-sheet.tsx
@@ -0,0 +1,106 @@
+import { useState } from "react";
+import {
+  Sheet,
+  SheetContent,
+  SheetHeader,
+  SheetTitle,
+} from "~/components/ui/sheet";
+import { Input } from "~/components/ui/input";
+import { Label } from "~/components/ui/label";
+import { Button } from "~/components/ui/button";
+import { useAuth } from "~/lib/auth";
+import { toast } from "sonner";
+
+interface Props {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+  onSwitchToLogin: () => void;
+}
+
+export function RegisterSheet({ open, onOpenChange, onSwitchToLogin }: Props) {
+  const { register } = useAuth();
+  const [email, setEmail] = useState("");
+  const [username, setUsername] = useState("");
+  const [password, setPassword] = useState("");
+  const [loading, setLoading] = useState(false);
+
+  async function handleSubmit(e: React.FormEvent) {
+    e.preventDefault();
+    setLoading(true);
+    try {
+      await register(email, username, password);
+      onOpenChange(false);
+      setEmail("");
+      setUsername("");
+      setPassword("");
+      toast.success("Account created");
+    } catch (err) {
+      toast.error(err instanceof Error ? err.message : "Registration failed");
+    } finally {
+      setLoading(false);
+    }
+  }
+
+  return (
+    <Sheet open={open} onOpenChange={onOpenChange}>
+      <SheetContent side="bottom" className="rounded-t-xl">
+        <SheetHeader>
+          <SheetTitle>Create account</SheetTitle>
+        </SheetHeader>
+        <form onSubmit={handleSubmit} className="flex flex-col gap-4 px-4 pb-6">
+          <div className="flex flex-col gap-2">
+            <Label htmlFor="register-email">Email</Label>
+            <Input
+              id="register-email"
+              type="email"
+              autoComplete="email"
+              placeholder="you@example.com"
+              value={email}
+              onChange={(e) => setEmail(e.target.value)}
+              required
+            />
+          </div>
+          <div className="flex flex-col gap-2">
+            <Label htmlFor="register-username">Username</Label>
+            <Input
+              id="register-username"
+              type="text"
+              autoComplete="username"
+              placeholder="johndoe"
+              value={username}
+              onChange={(e) => setUsername(e.target.value)}
+              required
+            />
+          </div>
+          <div className="flex flex-col gap-2">
+            <Label htmlFor="register-password">Password</Label>
+            <Input
+              id="register-password"
+              type="password"
+              autoComplete="new-password"
+              placeholder="min. 8 characters"
+              value={password}
+              onChange={(e) => setPassword(e.target.value)}
+              required
+              minLength={8}
+            />
+          </div>
+          <Button type="submit" disabled={loading} className="w-full">
+            {loading ? "Creating account..." : "Register"}
+          </Button>
+          <Button
+            type="button"
+            variant="ghost"
+            className="w-full text-sm text-muted-foreground"
+            onClick={() => {
+              onOpenChange(false);
+              onSwitchToLogin();
+            }}
+          >
+            Already have an account? Sign in
+          </Button>
+        </form>
+      </SheetContent>
+    </Sheet>
+  );
+}
--- a/app/app/components/section-nav.tsx
+++ b/app/app/components/section-nav.tsx
@@ -0,0 +1,46 @@
+import { Button } from "~/components/ui/button";
+import { ScrollArea, ScrollBar } from "~/components/ui/scroll-area";
+
+interface Props {
+  sections: Array<{ label: string | null; index: number }>;
+  onJump: (index: number) => void;
+}
+
+function abbreviate(label: string): string {
+  const lower = label.toLowerCase().replace(/[-_ ]/g, "");
+  if (lower.startsWith("verse")) return label.replace(/verse\s*/i, "V");
+  if (lower.startsWith("chorus") || lower.startsWith("refrain")) return "C";
+  if (lower.startsWith("bridge")) return "Br";
+  if (lower.startsWith("prechorus")) return "PC";
+  if (lower.startsWith("intro")) return "In";
+  if (lower.startsWith("outro")) return "Out";
+  if (lower.startsWith("instrumental") || lower.startsWith("interlude"))
+    return "Int";
+  if (lower.startsWith("solo")) return "Sol";
+  if (label.length > 4) return label.slice(0, 3);
+  return label;
+}
+
+export function SectionNav({ sections, onJump }: Props) {
+  const labeled = sections.filter((s) => s.label);
+  if (labeled.length === 0) return null;
+
+  return (
+    <ScrollArea className="min-w-0 flex-1">
+      <div className="flex gap-1 px-3 py-1.5">
+        {labeled.map((s) => (
+          <Button
+            key={s.index}
+            variant="secondary"
+            size="sm"
+            className="h-6 px-2 text-xs shrink-0"
+            onClick={() => onJump(s.index)}
+          >
+            {abbreviate(s.label!)}
+          </Button>
+        ))}
+      </div>
+      <ScrollBar orientation="horizontal" />
+    </ScrollArea>
+  );
+}
--- a/app/app/components/song-card.tsx
+++ b/app/app/components/song-card.tsx
@@ -1,16 +1,21 @@
 import { Link } from "react-router";
+import { Star } from "lucide-react";
 import { Badge } from "~/components/ui/badge";
 import { Card, CardContent } from "~/components/ui/card";
 import type { SongSummary } from "~/lib/types";

 interface Props {
  song: SongSummary;
+  isFavorite?: boolean;
 }

-export function SongCard({ song }: Props) {
+export function SongCard({ song, isFavorite }: Props) {
  return (
    <Link to={`/songs/${song.id}`}>
-      <Card className="h-full hover:bg-accent transition-colors cursor-pointer">
+      <Card className="h-full hover:bg-accent transition-colors cursor-pointer relative">
+        {isFavorite && (
+          <Star className="absolute top-2 right-2 w-3.5 h-3.5 fill-primary text-primary" />
+        )}
        <CardContent className="p-3 flex flex-col gap-1">
          <div className="flex flex-wrap gap-1">
            {song.preview_chords.map((chord) => (
--- a/app/app/components/transpose-bar.tsx
+++ b/app/app/components/transpose-bar.tsx
@@ -1,9 +1,23 @@
 import { useState } from "react";
 import { Button } from "~/components/ui/button";
 import {
-  DropdownMenu, DropdownMenuContent, DropdownMenuItem, DropdownMenuTrigger,
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuTrigger,
 } from "~/components/ui/dropdown-menu";
-import { ChevronUp, ChevronDown, Minus, Plus, MoreHorizontal, Pencil, Trash2 } from "lucide-react";
+import {
+  ChevronUp,
+  ChevronDown,
+  Maximize,
+  Minus,
+  Minimize,
+  MoreHorizontal,
+  Pencil,
+  Plus,
+  Star,
+  Trash2,
+} from "lucide-react";
 import { cn } from "~/lib/utils";
 import type { SongMeta } from "~/lib/types";

@@ -13,41 +27,100 @@ interface Props {
  onOffsetChange: (offset: number) => void;
  onEdit?: () => void;
  onDelete?: () => void;
-  fontSize?: 'sm' | 'base' | 'lg';
-  onFontSizeChange?: (size: 'sm' | 'base' | 'lg') => void;
+  fontSize?: "sm" | "base" | "lg";
+  onFontSizeChange?: (size: "sm" | "base" | "lg") => void;
  capo?: number;
  applyCapo?: boolean;
  onToggleCapo?: () => void;
+  isFavorite?: boolean;
+  onToggleFavorite?: () => void;
+  fullscreen?: boolean;
+  onToggleFullscreen?: () => void;
 }

-export function TransposeBar({ meta, offset, onOffsetChange, onEdit, onDelete, fontSize, onFontSizeChange, capo, applyCapo, onToggleCapo }: Props) {
+const NOTES_SHARP = ["C","C#","D","D#","E","F","F#","G","G#","A","A#","B"];
+const NOTES_FLAT = ["C","Db","D","Eb","E","F","Gb","G","Ab","A","Bb","B"];
+
+function transposedKey(key: string, offset: number): string {
+  const root = key.length >= 2 && (key[1] === "#" || key[1] === "b") ? key.slice(0, 2) : key.slice(0, 1);
+  const suffix = key.slice(root.length);
+  const notes = offset > 0 ? NOTES_SHARP : NOTES_FLAT;
+  const idx = NOTES_SHARP.indexOf(root) !== -1 ? NOTES_SHARP.indexOf(root) : NOTES_FLAT.indexOf(root);
+  if (idx === -1) return key;
+  const newIdx = ((idx + offset) % 12 + 12) % 12;
+  return notes[newIdx] + suffix;
+}
+
+export function TransposeBar({
+  meta,
+  offset,
+  onOffsetChange,
+  onEdit,
+  onDelete,
+  fontSize,
+  onFontSizeChange,
+  capo,
+  applyCapo,
+  onToggleCapo,
+  isFavorite,
+  onToggleFavorite,
+  fullscreen,
+  onToggleFullscreen,
+}: Props) {
  const [expanded, setExpanded] = useState(true);

  const label = offset === 0 ? "±0" : offset > 0 ? `+${offset}` : `${offset}`;

-  const menuButton = (onEdit || onDelete) ? (
-    <DropdownMenu>
-      <DropdownMenuTrigger asChild>
-        <Button variant="ghost" size="icon" className="h-7 w-7 shrink-0">
-          <MoreHorizontal className="w-4 h-4" />
+  const keyDisplay =
+    meta.original_key && offset !== 0
+      ? `Key: ${meta.original_key} → ${transposedKey(meta.original_key, offset)}`
+      : meta.original_key
+        ? `Key: ${meta.original_key}`
+        : null;
+
+  const menuButton =
+    onEdit || onDelete ? (
+      <DropdownMenu>
+        <DropdownMenuTrigger asChild>
+          <Button variant="ghost" size="icon" className="h-7 w-7 shrink-0">
+            <MoreHorizontal className="w-4 h-4" />
+          </Button>
+        </DropdownMenuTrigger>
+        <DropdownMenuContent align="end">
+          {onEdit && (
+            <DropdownMenuItem onClick={onEdit}>
+              <Pencil className="w-4 h-4 mr-2" />
+              Edit
+            </DropdownMenuItem>
+          )}
+          {onDelete && (
+            <DropdownMenuItem
+              onClick={onDelete}
+              className="text-destructive focus:text-destructive"
+            >
+              <Trash2 className="w-4 h-4 mr-2" />
+              Delete
+            </DropdownMenuItem>
+          )}
+        </DropdownMenuContent>
+      </DropdownMenu>
+    ) : null;
+
+  if (fullscreen) {
+    return (
+      <div className="flex items-center justify-between px-4 py-1.5 border-b bg-background">
+        <span className="text-sm font-semibold truncate">{meta.title}</span>
+        <Button
+          variant="ghost"
+          size="icon"
+          className="h-7 w-7"
+          onClick={onToggleFullscreen}
+        >
+          <Minimize className="w-4 h-4" />
        </Button>
-      </DropdownMenuTrigger>
-      <DropdownMenuContent align="end">
-        {onEdit && (
-          <DropdownMenuItem onClick={onEdit}>
-            <Pencil className="w-4 h-4 mr-2" />
-            Edit
-          </DropdownMenuItem>
-        )}
-        {onDelete && (
-          <DropdownMenuItem onClick={onDelete} className="text-destructive focus:text-destructive">
-            <Trash2 className="w-4 h-4 mr-2" />
-            Delete
-          </DropdownMenuItem>
-        )}
-      </DropdownMenuContent>
-    </DropdownMenu>
-  ) : null;
+      </div>
+    );
+  }

  if (!expanded) {
    return (
@@ -55,7 +128,12 @@ export function TransposeBar({ meta, offset, onOffsetChange, onEdit, onDelete, f
        <span className="text-sm font-semibold truncate">{meta.title}</span>
        <div className="flex items-center gap-1">
          {menuButton}
-          <Button variant="ghost" size="icon" className="h-7 w-7" onClick={() => setExpanded(true)}>
+          <Button
+            variant="ghost"
+            size="icon"
+            className="h-7 w-7"
+            onClick={() => setExpanded(true)}
+          >
            <ChevronDown className="w-4 h-4" />
          </Button>
        </div>
@@ -71,8 +149,40 @@ export function TransposeBar({ meta, offset, onOffsetChange, onEdit, onDelete, f
          <span className="text-sm text-muted-foreground">{meta.artist}</span>
        </div>
        <div className="flex items-center gap-1">
+          {onToggleFavorite && (
+            <Button
+              variant="ghost"
+              size="icon"
+              className="h-7 w-7 shrink-0"
+              onClick={onToggleFavorite}
+            >
+              <Star
+                className={cn(
+                  "w-4 h-4",
+                  isFavorite
+                    ? "fill-primary text-primary"
+                    : "text-muted-foreground",
+                )}
+              />
+            </Button>
+          )}
+          {onToggleFullscreen && (
+            <Button
+              variant="ghost"
+              size="icon"
+              className="h-7 w-7 shrink-0"
+              onClick={onToggleFullscreen}
+            >
+              <Maximize className="w-4 h-4" />
+            </Button>
+          )}
          {menuButton}
-          <Button variant="ghost" size="icon" className="h-7 w-7 shrink-0" onClick={() => setExpanded(false)}>
+          <Button
+            variant="ghost"
+            size="icon"
+            className="h-7 w-7 shrink-0"
+            onClick={() => setExpanded(false)}
+          >
            <ChevronUp className="w-4 h-4" />
          </Button>
        </div>
@@ -80,16 +190,19 @@ export function TransposeBar({ meta, offset, onOffsetChange, onEdit, onDelete, f

      <div className="flex items-center justify-between">
        <div className="flex gap-3 text-xs text-muted-foreground">
-          {meta.original_key && <span>Key: {meta.original_key}</span>}
+          {keyDisplay && <span>{keyDisplay}</span>}
          {capo != null && onToggleCapo ? (
            <button
              onClick={onToggleCapo}
              className={cn(
                "text-xs transition-colors",
-                applyCapo ? "text-primary" : "text-muted-foreground hover:text-foreground"
+                applyCapo
+                  ? "text-primary"
+                  : "text-muted-foreground hover:text-foreground",
              )}
            >
-              Capo {capo}{applyCapo ? " · sounding" : ""}
+              Capo {capo}
+              {applyCapo ? " · sounding" : ""}
            </button>
          ) : meta.capo != null ? (
            <span>Capo: {meta.capo}</span>
@@ -99,7 +212,7 @@ export function TransposeBar({ meta, offset, onOffsetChange, onEdit, onDelete, f
        <div className="flex items-center gap-2">
          {onFontSizeChange && (
            <div className="flex items-center gap-1">
-              {(['sm', 'base', 'lg'] as const).map((s) => (
+              {(["sm", "base", "lg"] as const).map((s) => (
                <button
                  key={s}
                  onClick={() => onFontSizeChange(s)}
@@ -107,21 +220,31 @@ export function TransposeBar({ meta, offset, onOffsetChange, onEdit, onDelete, f
                    "text-xs px-1.5 py-0.5 rounded transition-colors",
                    fontSize === s
                      ? "bg-primary text-primary-foreground"
-                      : "text-muted-foreground hover:text-foreground"
+                      : "text-muted-foreground hover:text-foreground",
                  )}
                >
-                  {s === 'sm' ? 'S' : s === 'base' ? 'M' : 'L'}
+                  {s === "sm" ? "S" : s === "base" ? "M" : "L"}
                </button>
              ))}
            </div>
          )}
-          <Button variant="ghost" size="icon" className="h-8 w-8"
-            onClick={() => onOffsetChange(Math.max(-11, offset - 1))}>
+          <Button
+            variant="ghost"
+            size="icon"
+            className="h-8 w-8"
+            onClick={() => onOffsetChange(Math.max(-11, offset - 1))}
+          >
            <Minus className="w-4 h-4" />
          </Button>
-          <span className="w-8 text-center text-sm font-mono font-semibold">{label}</span>
-          <Button variant="ghost" size="icon" className="h-8 w-8"
-            onClick={() => onOffsetChange(Math.min(11, offset + 1))}>
+          <span className="w-8 text-center text-sm font-mono font-semibold">
+            {label}
+          </span>
+          <Button
+            variant="ghost"
+            size="icon"
+            className="h-8 w-8"
+            onClick={() => onOffsetChange(Math.min(11, offset + 1))}
+          >
            <Plus className="w-4 h-4" />
          </Button>
        </div>
--- a/app/app/hooks/use-favorites.ts
+++ b/app/app/hooks/use-favorites.ts
@@ -0,0 +1,57 @@
+import { useCallback, useSyncExternalStore } from "react";
+
+const STORAGE_KEY = "favorites";
+
+let listeners: Array<() => void> = [];
+let cachedRaw: string | null = null;
+let cachedParsed: string[] = [];
+
+function getSnapshot(): string[] {
+  try {
+    const raw = localStorage.getItem(STORAGE_KEY);
+    if (raw !== cachedRaw) {
+      cachedRaw = raw;
+      cachedParsed = raw ? JSON.parse(raw) : [];
+    }
+  } catch {
+    cachedParsed = [];
+  }
+  return cachedParsed;
+}
+
+function subscribe(cb: () => void) {
+  listeners.push(cb);
+  return () => {
+    listeners = listeners.filter((l) => l !== cb);
+  };
+}
+
+const EMPTY: string[] = [];
+function getServerSnapshot(): string[] {
+  return EMPTY;
+}
+
+function notify() {
+  cachedRaw = null;
+  listeners.forEach((l) => l());
+}
+
+export function useFavorites() {
+  const favorites = useSyncExternalStore(subscribe, getSnapshot, getServerSnapshot);
+
+  const isFavorite = useCallback(
+    (id: string) => favorites.includes(id),
+    [favorites],
+  );
+
+  const toggle = useCallback((id: string) => {
+    const current = getSnapshot();
+    const next = current.includes(id)
+      ? current.filter((f) => f !== id)
+      : [...current, id];
+    localStorage.setItem(STORAGE_KEY, JSON.stringify(next));
+    notify();
+  }, []);
+
+  return { favorites, isFavorite, toggle };
+}
--- a/app/app/hooks/use-fullscreen.tsx
+++ b/app/app/hooks/use-fullscreen.tsx
@@ -0,0 +1,22 @@
+import { createContext, useCallback, useContext, useMemo, useState, type ReactNode } from "react";
+
+interface FullscreenState {
+  isFullscreen: boolean;
+  toggle: () => void;
+}
+
+const FullscreenContext = createContext<FullscreenState>({
+  isFullscreen: false,
+  toggle: () => {},
+});
+
+export function FullscreenProvider({ children }: { children: ReactNode }) {
+  const [isFullscreen, setIsFullscreen] = useState(false);
+  const toggle = useCallback(() => setIsFullscreen((v) => !v), []);
+  const value = useMemo(() => ({ isFullscreen, toggle }), [isFullscreen, toggle]);
+  return <FullscreenContext value={value}>{children}</FullscreenContext>;
+}
+
+export function useFullscreen() {
+  return useContext(FullscreenContext);
+}
--- a/app/app/hooks/use-wake-lock.ts
+++ b/app/app/hooks/use-wake-lock.ts
@@ -0,0 +1,28 @@
+import { useEffect, useRef } from "react";
+
+export function useWakeLock() {
+  const lockRef = useRef<WakeLockSentinel | null>(null);
+
+  useEffect(() => {
+    async function acquire() {
+      try {
+        lockRef.current = await navigator.wakeLock.request("screen");
+      } catch {
+        // not supported or denied
+      }
+    }
+
+    acquire();
+
+    function handleVisibility() {
+      if (document.visibilityState === "visible") acquire();
+    }
+
+    document.addEventListener("visibilitychange", handleVisibility);
+
+    return () => {
+      document.removeEventListener("visibilitychange", handleVisibility);
+      lockRef.current?.release().catch(() => {});
+    };
+  }, []);
+}
--- a/app/app/lib/api.ts
+++ b/app/app/lib/api.ts
@@ -1,6 +1,87 @@
-import type { Song, SongSummary, StoredSong, UpdateSongRequest } from "./types";
+import type { LoginResponse, RefreshResponse, Song, SongSummary, StoredSong, UpdateSongRequest } from "./types";

-const API_BASE = import.meta.env.VITE_API_URL ?? "http://localhost:8000";
+const API_BASE = import.meta.env.VITE_API_URL ?? "/api";
+
+const TOKEN_KEY = "pocket_chords_token";
+const REFRESH_KEY = "pocket_chords_refresh_token";
+
+export function getToken(): string | null {
+  return localStorage.getItem(TOKEN_KEY);
+}
+
+export function getRefreshToken(): string | null {
+  return localStorage.getItem(REFRESH_KEY);
+}
+
+export function setTokens(token: string, refreshToken: string) {
+  localStorage.setItem(TOKEN_KEY, token);
+  localStorage.setItem(REFRESH_KEY, refreshToken);
+}
+
+export function clearTokens() {
+  localStorage.removeItem(TOKEN_KEY);
+  localStorage.removeItem(REFRESH_KEY);
+}
+
+async function authFetch(url: string, init: RequestInit = {}): Promise<Response> {
+  const token = getToken();
+  const headers = new Headers(init.headers);
+  if (token) headers.set("Authorization", `Bearer ${token}`);
+  const res = await fetch(url, { ...init, headers });
+  if (res.status === 401) clearTokens();
+  return res;
+}
+
+// --- Auth ---
+
+export async function apiLogin(email: string, password: string): Promise<LoginResponse> {
+  const res = await fetch(`${API_BASE}/auth/login`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ email, password }),
+  });
+  if (!res.ok) {
+    const data = await res.json().catch(() => ({}));
+    throw new Error((data as { error?: string }).error ?? `Login failed: ${res.status}`);
+  }
+  return res.json();
+}
+
+export async function apiRegister(email: string, username: string, password: string): Promise<void> {
+  const res = await fetch(`${API_BASE}/auth/register`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ email, username, password }),
+  });
+  if (!res.ok) {
+    const data = await res.json().catch(() => ({}));
+    throw new Error((data as { error?: string }).error ?? `Registration failed: ${res.status}`);
+  }
+}
+
+export async function apiRefresh(refreshToken: string): Promise<RefreshResponse> {
+  const res = await fetch(`${API_BASE}/auth/refresh`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ refresh_token: refreshToken }),
+  });
+  if (!res.ok) {
+    clearTokens();
+    throw new Error("Session expired");
+  }
+  return res.json();
+}
+
+export async function apiLogout(refreshToken: string): Promise<void> {
+  await fetch(`${API_BASE}/auth/logout`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ refresh_token: refreshToken }),
+  }).catch(() => {});
+  clearTokens();
+}
+
+// --- Songs (read — public) ---

 export async function listSongs(q = "", sort = "date", order = "desc"): Promise<SongSummary[]> {
  const params = new URLSearchParams();
@@ -13,9 +94,16 @@ export async function listSongs(q = "", sort = "date", order = "desc"): Promise<
  return res.json();
 }

-export async function getSong(id: string, applyCapo = false): Promise<Song | null> {
-  const url = applyCapo
-    ? `${API_BASE}/songs/${id}?apply_capo=true`
+export async function getSong(
+  id: string,
+  opts: { applyCapo?: boolean; transpose?: number } = {},
+): Promise<Song | null> {
+  const params = new URLSearchParams();
+  if (opts.applyCapo) params.set("apply_capo", "true");
+  if (opts.transpose && opts.transpose !== 0)
+    params.set("transpose", String(opts.transpose));
+  const url = params.size
+    ? `${API_BASE}/songs/${id}?${params}`
    : `${API_BASE}/songs/${id}`;
  const res = await fetch(url);
  if (res.status === 404) return null;
@@ -23,11 +111,10 @@ export async function getSong(id: string, applyCapo = false): Promise<Song | nul
  return res.json();
 }

-export async function createSong(body: {
-  source?: string;
-  html?: string;
-}): Promise<StoredSong> {
-  const res = await fetch(`${API_BASE}/songs`, {
+// --- Songs (mutations — auth required) ---
+
+export async function createSong(body: { source?: string; html?: string }): Promise<StoredSong> {
+  const res = await authFetch(`${API_BASE}/songs`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(body),
@@ -40,12 +127,12 @@ export async function createSong(body: {
 }

 export async function deleteSong(id: string): Promise<void> {
-  const res = await fetch(`${API_BASE}/songs/${id}`, { method: "DELETE" });
+  const res = await authFetch(`${API_BASE}/songs/${id}`, { method: "DELETE" });
  if (!res.ok) throw new Error(`Failed to delete song: HTTP ${res.status}`);
 }

 export async function updateSong(id: string, patch: UpdateSongRequest): Promise<SongSummary> {
-  const res = await fetch(`${API_BASE}/songs/${id}`, {
+  const res = await authFetch(`${API_BASE}/songs/${id}`, {
    method: "PATCH",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(patch),
--- a/app/app/lib/auth.tsx
+++ b/app/app/lib/auth.tsx
@@ -0,0 +1,76 @@
+import { createContext, useCallback, useContext, useEffect, useMemo, useState, type ReactNode } from "react";
+import { apiLogin, apiLogout, apiRefresh, apiRegister, clearTokens, getRefreshToken, getToken, setTokens } from "./api";
+
+interface AuthState {
+  userId: string | null;
+  isAuthenticated: boolean;
+  isLoading: boolean;
+  login: (email: string, password: string) => Promise<void>;
+  register: (email: string, username: string, password: string) => Promise<void>;
+  logout: () => Promise<void>;
+}
+
+const AuthContext = createContext<AuthState | null>(null);
+
+export function AuthProvider({ children }: { children: ReactNode }) {
+  const [userId, setUserId] = useState<string | null>(null);
+  const [isLoading, setIsLoading] = useState(true);
+
+  useEffect(() => {
+    const token = getToken();
+    const refresh = getRefreshToken();
+    if (!token || !refresh) {
+      setIsLoading(false);
+      return;
+    }
+
+    apiRefresh(refresh)
+      .then((res) => {
+        setTokens(res.token, res.refresh_token);
+        const payload = JSON.parse(atob(res.token.split(".")[1]));
+        setUserId(payload.sub);
+      })
+      .catch(() => {
+        clearTokens();
+        setUserId(null);
+      })
+      .finally(() => setIsLoading(false));
+  }, []);
+
+  const login = useCallback(async (email: string, password: string) => {
+    const res = await apiLogin(email, password);
+    setTokens(res.token, res.refresh_token);
+    setUserId(res.user_id);
+  }, []);
+
+  const register = useCallback(async (email: string, username: string, password: string) => {
+    await apiRegister(email, username, password);
+    await login(email, password);
+  }, [login]);
+
+  const logout = useCallback(async () => {
+    const refresh = getRefreshToken();
+    if (refresh) await apiLogout(refresh);
+    setUserId(null);
+  }, []);
+
+  const value = useMemo<AuthState>(
+    () => ({
+      userId,
+      isAuthenticated: !!userId,
+      isLoading,
+      login,
+      register,
+      logout,
+    }),
+    [userId, isLoading, login, register, logout],
+  );
+
+  return <AuthContext value={value}>{children}</AuthContext>;
+}
+
+export function useAuth(): AuthState {
+  const ctx = useContext(AuthContext);
+  if (!ctx) throw new Error("useAuth must be used within AuthProvider");
+  return ctx;
+}
--- a/app/app/lib/transpose.ts
+++ b/app/app/lib/transpose.ts
@@ -1,34 +0,0 @@
-import type { Song } from "./types";
-
-const NOTES_SHARP = ["C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"];
-const NOTES_FLAT  = ["C", "Db", "D", "Eb", "E", "F", "Gb", "G", "Ab", "A", "Bb", "B"];
-
-function transposeChord(chord: string, semitones: number): string {
-  const match = chord.match(/^([A-G][#b]?)(.*)/);
-  if (!match) return chord;
-  const [, root, descriptor] = match;
-  const idx = NOTES_SHARP.indexOf(root) !== -1
-    ? NOTES_SHARP.indexOf(root)
-    : NOTES_FLAT.indexOf(root);
-  if (idx === -1) return chord;
-  const newIdx = ((idx + semitones) % 12 + 12) % 12;
-  const notes = semitones >= 0 ? NOTES_SHARP : NOTES_FLAT;
-  return notes[newIdx] + descriptor;
-}
-
-export function transposeSong(song: Song, semitones: number): Song {
-  if (semitones === 0) return song;
-  return {
-    ...song,
-    sections: song.sections.map((section) => ({
-      ...section,
-      lines: section.lines.map((line) => ({
-        ...line,
-        chords: line.chords.map((cp) => ({
-          ...cp,
-          chord: transposeChord(cp.chord, semitones),
-        })),
-      })),
-    })),
-  };
-}
--- a/app/app/lib/types.ts
+++ b/app/app/lib/types.ts
@@ -28,11 +28,9 @@ export interface Song {
  sections: Section[];
 }

-// Trimmed version used in the library grid
 export interface SongSummary {
  id: string;
  meta: SongMeta;
-  // First 5 unique chord names from the song, in order of appearance
  preview_chords: string[];
 }

@@ -46,3 +44,16 @@ export interface UpdateSongRequest {
  artist?: string;
  original_key?: string;
 }
+
+export interface LoginResponse {
+  token: string;
+  refresh_token: string;
+  user_id: string;
+  expires_at: string;
+}
+
+export interface RefreshResponse {
+  token: string;
+  refresh_token: string;
+  expires_at: string;
+}
--- a/app/app/root.tsx
+++ b/app/app/root.tsx
@@ -6,12 +6,18 @@ import {
  Scripts,
  ScrollRestoration,
 } from "react-router";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { ThemeProvider } from "next-themes";

 import type { Route } from "./+types/root";
 import "./app.css";
+import { AuthProvider } from "./lib/auth";
 import { TooltipProvider } from "./components/ui/tooltip";

+const queryClient = new QueryClient({
+  defaultOptions: { queries: { staleTime: 30_000, retry: 1 } },
+});
+
 export const links: Route.LinksFunction = () => [
  { rel: "preconnect", href: "https://fonts.googleapis.com" },
  {
@@ -42,13 +48,17 @@ export function Layout({ children }: { children: React.ReactNode }) {
        <Links />
      </head>
      <body>
-        <ThemeProvider attribute="class" defaultTheme="system" enableSystem>
-          <TooltipProvider>
-            {children}
-            <ScrollRestoration />
-            <Scripts />
-          </TooltipProvider>
-        </ThemeProvider>
+        <QueryClientProvider client={queryClient}>
+          <ThemeProvider attribute="class" defaultTheme="system" enableSystem>
+            <AuthProvider>
+              <TooltipProvider>
+                {children}
+                <ScrollRestoration />
+                <Scripts />
+              </TooltipProvider>
+            </AuthProvider>
+          </ThemeProvider>
+        </QueryClientProvider>
      </body>
    </html>
  );
--- a/app/app/routes/home.tsx
+++ b/app/app/routes/home.tsx
@@ -1,74 +1,83 @@
 import { useCallback, useEffect, useRef, useState } from "react";
-import { useSearchParams, useRevalidator } from "react-router";
-import type { Route } from "./+types/home";
+import { useSearchParams } from "react-router";
+import { useQuery, useQueryClient } from "@tanstack/react-query";
 import { Button } from "~/components/ui/button";
 import { Input } from "~/components/ui/input";
 import { Card, CardContent } from "~/components/ui/card";
-import { Plus } from "lucide-react";
+import { Loader2, Plus } from "lucide-react";
 import { SongCard } from "~/components/song-card";
 import { AddSongSheet } from "~/components/add-song-sheet";
 import { listSongs } from "~/lib/api";
+import { useAuth } from "~/lib/auth";
+import { useFavorites } from "~/hooks/use-favorites";
 import { cn } from "~/lib/utils";
-import type { SongSummary } from "~/lib/types";

-export function meta({}: Route.MetaArgs) {
+export function meta() {
  return [
    { title: "PocketChords" },
    { name: "description", content: "Your personal chord chart library" },
  ];
 }

-export async function loader({ request }: Route.LoaderArgs) {
-  const url = new URL(request.url);
-  const q = url.searchParams.get("q") ?? "";
-  const sort = url.searchParams.get("sort") ?? "date";
-  const order = url.searchParams.get("order") ?? "desc";
-  try {
-    const songs = await listSongs(q, sort, order);
-    return { songs, q, sort, order, error: false };
-  } catch {
-    return { songs: [], q, sort, order, error: true };
-  }
-}
-
-export default function Home({ loaderData }: Route.ComponentProps) {
-  const { songs, q: initialQ, sort: initialSort, order: initialOrder, error } = loaderData;
+export default function Home() {
+  const { isAuthenticated } = useAuth();
+  const { isFavorite } = useFavorites();
+  const queryClient = useQueryClient();
  const [searchParams, setSearchParams] = useSearchParams();
  const [sheetOpen, setSheetOpen] = useState(false);
-  const [localSongs, setLocalSongs] = useState<SongSummary[]>([]);
-  const revalidator = useRevalidator();

-  const [inputValue, setInputValue] = useState(initialQ);
+  const q = searchParams.get("q") ?? "";
+  const sort = searchParams.get("sort") ?? "date";
+  const order = searchParams.get("order") ?? "desc";
+
+  const [inputValue, setInputValue] = useState(q);
  const debounceRef = useRef<ReturnType<typeof setTimeout> | null>(null);

-  const handleSearch = useCallback((value: string) => {
-    setInputValue(value);
-    if (debounceRef.current) clearTimeout(debounceRef.current);
-    debounceRef.current = setTimeout(() => {
-      const next: Record<string, string> = {};
-      if (value.trim()) next.q = value.trim();
-      if (initialSort !== "date") next.sort = initialSort;
-      if (initialOrder !== "desc") next.order = initialOrder;
-      setSearchParams(next, { replace: true });
-    }, 300);
-  }, [setSearchParams, initialSort, initialOrder]);
+  const { data: songs = [], isLoading, isError, refetch } = useQuery({
+    queryKey: ["songs", q, sort, order],
+    queryFn: () => listSongs(q, sort, order),
+  });

-  useEffect(() => () => { if (debounceRef.current) clearTimeout(debounceRef.current); }, []);
+  const handleSearch = useCallback(
+    (value: string) => {
+      setInputValue(value);
+      if (debounceRef.current) clearTimeout(debounceRef.current);
+      debounceRef.current = setTimeout(() => {
+        const next: Record<string, string> = {};
+        if (value.trim()) next.q = value.trim();
+        if (sort !== "date") next.sort = sort;
+        if (order !== "desc") next.order = order;
+        setSearchParams(next, { replace: true });
+      }, 300);
+    },
+    [setSearchParams, sort, order],
+  );

-  const allSongs = [...songs, ...localSongs];
+  useEffect(
+    () => () => {
+      if (debounceRef.current) clearTimeout(debounceRef.current);
+    },
+    [],
+  );
+
+  const allSongs = songs.toSorted((a, b) => {
+    const af = isFavorite(a.id) ? 0 : 1;
+    const bf = isFavorite(b.id) ? 0 : 1;
+    return af - bf;
+  });

  return (
    <div className="flex flex-col h-full max-w-lg mx-auto">
-
      <div className="flex items-center justify-between px-4 pt-4 pb-2">
        <h1 className="text-lg font-bold">PocketChords</h1>
-        <Button size="sm" onClick={() => setSheetOpen(true)}>
-          <Plus className="w-4 h-4 mr-1" />
-          Add
-        </Button>
+        {isAuthenticated && (
+          <Button size="sm" onClick={() => setSheetOpen(true)}>
+            <Plus className="w-4 h-4 mr-1" />
+            Add
+          </Button>
+        )}
      </div>

-
      <div className="px-4 pb-3">
        <Input
          placeholder="Search songs..."
@@ -79,11 +88,24 @@ export default function Home({ loaderData }: Route.ComponentProps) {
      </div>

      <div className="flex gap-1 px-4 pb-2">
-        {([["date", "Date"], ["title", "Title"], ["artist", "Artist"]] as const).map(([val, label]) => (
+        {(
+          [
+            ["date", "Date"],
+            ["title", "Title"],
+            ["artist", "Artist"],
+          ] as const
+        ).map(([val, label]) => (
          <button
            key={val}
            onClick={() => {
-              const newOrder = initialSort === val ? (initialOrder === "asc" ? "desc" : "asc") : (val === "date" ? "desc" : "asc");
+              const newOrder =
+                sort === val
+                  ? order === "asc"
+                    ? "desc"
+                    : "asc"
+                  : val === "date"
+                    ? "desc"
+                    : "asc";
              const next: Record<string, string> = {};
              if (inputValue.trim()) next.q = inputValue.trim();
              next.sort = val;
@@ -92,57 +114,70 @@ export default function Home({ loaderData }: Route.ComponentProps) {
            }}
            className={cn(
              "text-xs px-2 py-1 rounded-full border transition-colors",
-              initialSort === val
+              sort === val
                ? "bg-primary text-primary-foreground border-primary"
-                : "text-muted-foreground border-border"
+                : "text-muted-foreground border-border",
            )}
          >
-            {label}{initialSort === val ? (initialOrder === "asc" ? " ↑" : " ↓") : ""}
+            {label}
+            {sort === val ? (order === "asc" ? " ↑" : " ↓") : ""}
          </button>
        ))}
      </div>

-      {error && (
+      {isError && (
        <div className="flex flex-col items-center gap-3 pt-8 pb-4 px-6 text-center">
          <p className="text-sm text-muted-foreground">
            Couldn't load your songs. Is the API running?
          </p>
-          <Button
-            variant="outline"
-            size="sm"
-            onClick={() => revalidator.revalidate()}
-          >
+          <Button variant="outline" size="sm" onClick={() => refetch()}>
            Retry
          </Button>
        </div>
      )}

-
      <div className="flex-1 overflow-y-auto px-4 pb-4">
-        {!error && allSongs.length === 0 && (
+        {isLoading && !isError && (
+          <div className="flex justify-center pt-12">
+            <Loader2 className="w-6 h-6 animate-spin text-muted-foreground" />
+          </div>
+        )}
+        {!isLoading && !isError && allSongs.length === 0 && (
          <p className="text-sm text-muted-foreground text-center pt-8 pb-4">
-            {initialQ ? "No songs match your search." : "No songs yet. Tap Add to get started."}
+            {q
+              ? "No songs match your search."
+              : "No songs yet. Tap Add to get started."}
          </p>
        )}
-        <div className="grid grid-cols-2 gap-3">
-          {allSongs.map((song) => (
-            <SongCard key={song.id} song={song} />
-          ))}
-          <Card
-            className="h-full border-dashed cursor-pointer hover:bg-accent transition-colors"
-            onClick={() => setSheetOpen(true)}
-          >
-            <CardContent className="p-3 flex items-center justify-center h-full min-h-[80px]">
-              <Plus className="w-6 h-6 text-muted-foreground" />
-            </CardContent>
-          </Card>
-        </div>
+        {!isLoading && (
+          <div className="grid grid-cols-2 gap-3">
+            {allSongs.map((song) => (
+              <SongCard
+                key={song.id}
+                song={song}
+                isFavorite={isFavorite(song.id)}
+              />
+            ))}
+            {isAuthenticated && (
+              <Card
+                className="h-full border-dashed cursor-pointer hover:bg-accent transition-colors"
+                onClick={() => setSheetOpen(true)}
+              >
+                <CardContent className="p-3 flex items-center justify-center h-full min-h-[80px]">
+                  <Plus className="w-6 h-6 text-muted-foreground" />
+                </CardContent>
+              </Card>
+            )}
+          </div>
+        )}
      </div>

      <AddSongSheet
        open={sheetOpen}
        onOpenChange={setSheetOpen}
-        onSongAdded={(summary) => setLocalSongs((prev) => [...prev, summary])}
+        onSongAdded={() =>
+          queryClient.invalidateQueries({ queryKey: ["songs"] })
+        }
      />
    </div>
  );
--- a/app/app/routes/layout.tsx
+++ b/app/app/routes/layout.tsx
@@ -1,15 +1,26 @@
 import { Outlet } from "react-router";
 import { Toaster } from "sonner";
 import { BottomNav } from "~/components/bottom-nav";
+import { FullscreenProvider, useFullscreen } from "~/hooks/use-fullscreen";
+
+function LayoutInner() {
+  const { isFullscreen } = useFullscreen();

-export default function Layout() {
  return (
    <div className="flex flex-col h-dvh">
      <div className="flex-1 overflow-hidden">
        <Outlet />
      </div>
-      <BottomNav />
+      {!isFullscreen && <BottomNav />}
      <Toaster position="top-center" richColors />
    </div>
  );
 }
+
+export default function Layout() {
+  return (
+    <FullscreenProvider>
+      <LayoutInner />
+    </FullscreenProvider>
+  );
+}
--- a/app/app/routes/songs.$id.tsx
+++ b/app/app/routes/songs.$id.tsx
@@ -1,6 +1,8 @@
-import { useEffect, useState, useRef, useCallback } from "react";
-import { data, Link } from "react-router";
-import type { Route } from "./+types/songs.$id";
+import { useState, useRef, useCallback } from "react";
+import { Link, useParams } from "react-router";
+import { useQuery } from "@tanstack/react-query";
+import { Loader2 } from "lucide-react";
+import { Button } from "~/components/ui/button";
 import { TransposeBar } from "~/components/transpose-bar";
 import { ChordChart } from "~/components/chord-chart";
 import { ChordGrid } from "~/components/chord-diagram/chord-grid";
@@ -8,69 +10,65 @@ import { ChordDiagram } from "~/components/chord-diagram/chord-diagram";
 import type { Instrument } from "~/components/chord-diagram/chord-diagram";
 import { EditSongSheet } from "~/components/edit-song-sheet";
 import { DeleteSongDialog } from "~/components/delete-song-dialog";
-import { transposeSong } from "~/lib/transpose";
+import { SectionNav } from "~/components/section-nav";
+import { AutoScrollControls } from "~/components/auto-scroll-controls";
 import { extractUniqueChords } from "~/lib/song-utils";
 import { getSong } from "~/lib/api";
-import type { Song, SongSummary } from "~/lib/types";
+import { useAuth } from "~/lib/auth";
+import { useFavorites } from "~/hooks/use-favorites";
+import { useFullscreen } from "~/hooks/use-fullscreen";
+import { useWakeLock } from "~/hooks/use-wake-lock";
+import type { SongSummary } from "~/lib/types";

-export function meta({ data }: Route.MetaArgs) {
-  if (!data?.song) return [{ title: "PocketChords" }];
-  return [
-    { title: `${data.song.meta.title} — PocketChords` },
-    { name: "description", content: data.song.meta.artist },
-  ];
-}
-
-export async function loader({ params }: Route.LoaderArgs) {
-  const id = params.id ?? "";
-  try {
-    const song = await getSong(id);
-    if (!song) throw data("Song not found", { status: 404 });
-    return { song, id };
-  } catch (err: unknown) {
-    if (err && typeof err === "object" && "status" in err && (err as { status: number }).status === 404) {
-      throw err;
-    }
-    return { song: null as Song | null, id };
-  }
-}
-
-type FontSize = 'sm' | 'base' | 'lg';
+type FontSize = "sm" | "base" | "lg";

 function initFontSize(): FontSize {
  try {
-    const v = localStorage.getItem('fontSize');
-    if (v === 'sm' || v === 'base' || v === 'lg') return v;
-  } catch { /* noop */ }
-  return 'sm';
+    const v = localStorage.getItem("fontSize");
+    if (v === "sm" || v === "base" || v === "lg") return v;
+  } catch {
+    /* noop */
+  }
+  return "sm";
 }

 function initInstrument(): Instrument {
  try {
-    const v = localStorage.getItem('chordDiagramInstrument');
-    if (v === 'piano' || v === 'guitar') return v;
-  } catch { /* noop */ }
-  return 'piano';
+    const v = localStorage.getItem("chordDiagramInstrument");
+    if (v === "piano" || v === "guitar") return v;
+  } catch {
+    /* noop */
+  }
+  return "piano";
 }

-export default function SongDetail({ loaderData }: Route.ComponentProps) {
-  const { song: initialSong, id } = loaderData;
-  const [baseSong, setBaseSong] = useState<Song | null>(initialSong ?? null);
-  const [displayedSong, setDisplayedSong] = useState<Song | null>(initialSong ?? null);
+function initOffset(id: string): number {
+  try {
+    const v = localStorage.getItem(`transpose:${id}`);
+    if (v !== null) {
+      const n = parseInt(v, 10);
+      if (!isNaN(n)) return n;
+    }
+  } catch {
+    /* noop */
+  }
+  return 0;
+}
+
+export function meta() {
+  return [{ title: "PocketChords" }];
+}
+
+export default function SongDetail() {
+  const { id = "" } = useParams();
+  const { isAuthenticated } = useAuth();
+  const { isFavorite, toggle: toggleFavorite } = useFavorites();
+  const { isFullscreen, toggle: toggleFullscreen } = useFullscreen();
+
+  useWakeLock();
+
+  const [offset, setOffset] = useState(() => initOffset(id));
  const [applyCapo, setApplyCapo] = useState(false);
-
-  const initOffset = (() => {
-    try {
-      const v = localStorage.getItem(`transpose:${id}`);
-      if (v !== null) {
-        const n = parseInt(v, 10);
-        if (!isNaN(n)) return n;
-      }
-    } catch { /* noop */ }
-    return 0;
-  })();
-
-  const [offset, setOffset] = useState(initOffset);
  const [fontSize, setFontSize] = useState<FontSize>(initFontSize);
  const [editOpen, setEditOpen] = useState(false);
  const [deleteOpen, setDeleteOpen] = useState(false);
@@ -78,49 +76,86 @@ export default function SongDetail({ loaderData }: Route.ComponentProps) {
  const [instrument, setInstrument] = useState<Instrument>(initInstrument);
  const scrollRef = useRef<HTMLDivElement>(null);

-  useEffect(() => {
-    if (applyCapo && baseSong?.meta.capo) {
-      getSong(id, true).then((s) => { if (s) setDisplayedSong(s); });
-    } else {
-      setDisplayedSong(baseSong);
-    }
-  }, [applyCapo]); // eslint-disable-line
+  const { data: baseSong, isLoading } = useQuery({
+    queryKey: ["song", id],
+    queryFn: () => getSong(id),
+  });
+
+  const { data: displayedSong } = useQuery({
+    queryKey: ["song", id, "view", offset, applyCapo],
+    queryFn: () => getSong(id, { applyCapo, transpose: offset }),
+    enabled: !!baseSong,
+  });

  function handleOffsetChange(newOffset: number) {
    setOffset(newOffset);
-    try { localStorage.setItem(`transpose:${id}`, String(newOffset)); } catch { /* noop */ }
+    try {
+      localStorage.setItem(`transpose:${id}`, String(newOffset));
+    } catch {
+      /* noop */
+    }
  }

  function handleFontSizeChange(size: FontSize) {
    setFontSize(size);
-    try { localStorage.setItem('fontSize', size); } catch { /* noop */ }
+    try {
+      localStorage.setItem("fontSize", size);
+    } catch {
+      /* noop */
+    }
  }

  function handleInstrumentChange(i: Instrument) {
    setInstrument(i);
-    try { localStorage.setItem('chordDiagramInstrument', i); } catch { /* noop */ }
+    try {
+      localStorage.setItem("chordDiagramInstrument", i);
+    } catch {
+      /* noop */
+    }
  }

  const handleScroll = useCallback(() => setActiveChord(null), []);

-  if (!baseSong || !displayedSong) {
+  function handleSectionJump(index: number) {
+    const el = document.getElementById(`section-${index}`);
+    el?.scrollIntoView({ behavior: "smooth", block: "start" });
+  }
+
+  if (isLoading) {
+    return (
+      <div className="flex items-center justify-center h-full">
+        <Loader2 className="w-6 h-6 animate-spin text-muted-foreground" />
+      </div>
+    );
+  }
+
+  const song = displayedSong ?? baseSong;
+
+  if (!baseSong || !song) {
    return (
      <div className="flex flex-col items-center justify-center h-full gap-4">
-        <p className="text-muted-foreground text-sm">Song not found or unavailable.</p>
-        <Link to="/" className="text-sm text-primary underline-offset-4 hover:underline">
+        <p className="text-muted-foreground text-sm">
+          Song not found or unavailable.
+        </p>
+        <Link
+          to="/"
+          className="text-sm text-primary underline-offset-4 hover:underline"
+        >
          ← Back to library
        </Link>
      </div>
    );
  }

-  const displayed = transposeSong(displayedSong, offset);
-  const uniqueChords = extractUniqueChords(displayed.sections);
+  const uniqueChords = extractUniqueChords(song.sections);
+  const sectionItems = song.sections.map((s, i) => ({
+    label: s.label,
+    index: i,
+  }));
  const handleChordClick = (chord: string) => setActiveChord(chord);

  function handleUpdated(summary: SongSummary) {
-    setBaseSong((prev) => prev ? { ...prev, meta: summary.meta } : prev);
-    setDisplayedSong((prev) => prev ? { ...prev, meta: summary.meta } : prev);
+    // meta-only update; react-query will refetch on next focus
  }

  return (
@@ -129,18 +164,20 @@ export default function SongDetail({ loaderData }: Route.ComponentProps) {
        meta={baseSong.meta}
        offset={offset}
        onOffsetChange={handleOffsetChange}
-        onEdit={() => setEditOpen(true)}
-        onDelete={() => setDeleteOpen(true)}
+        onEdit={isAuthenticated ? () => setEditOpen(true) : undefined}
+        onDelete={isAuthenticated ? () => setDeleteOpen(true) : undefined}
        fontSize={fontSize}
        onFontSizeChange={handleFontSizeChange}
        capo={baseSong.meta.capo ?? undefined}
        applyCapo={applyCapo}
        onToggleCapo={() => setApplyCapo((v) => !v)}
+        isFavorite={isFavorite(id)}
+        onToggleFavorite={() => toggleFavorite(id)}
+        fullscreen={isFullscreen}
+        onToggleFullscreen={toggleFullscreen}
      />

-      {/* Body: single column on mobile, two columns on desktop */}
      <div className="flex-1 overflow-hidden flex flex-col lg:flex-row">
-        {/* Left / main column */}
        <div
          className="flex-1 overflow-y-auto"
          ref={scrollRef}
@@ -148,12 +185,11 @@ export default function SongDetail({ loaderData }: Route.ComponentProps) {
        >
          <div className="max-w-lg mx-auto lg:max-w-none">
            <ChordChart
-              sections={displayed.sections}
+              sections={song.sections}
              fontSize={fontSize}
              onChordClick={handleChordClick}
            />

-            {/* Mobile bottom chord grid (hidden on desktop) */}
            <div className="lg:hidden border-t border-border">
              <ChordGrid
                chords={uniqueChords}
@@ -164,7 +200,6 @@ export default function SongDetail({ loaderData }: Route.ComponentProps) {
          </div>
        </div>

-        {/* Desktop side column (hidden on mobile) */}
        <div className="hidden lg:block w-72 overflow-y-auto border-l border-border shrink-0">
          <ChordGrid
            chords={uniqueChords}
@@ -174,16 +209,22 @@ export default function SongDetail({ loaderData }: Route.ComponentProps) {
        </div>
      </div>

-      {/* Mobile inline popup — fixed bottom, dismissed on scroll */}
+      <div className="lg:hidden border-t border-border bg-background flex items-center">
+        <SectionNav sections={sectionItems} onJump={handleSectionJump} />
+        <AutoScrollControls scrollRef={scrollRef} />
+      </div>
+
      {activeChord && (
        <div className="lg:hidden fixed bottom-0 left-0 right-0 z-50 border-t border-border bg-background shadow-lg p-3 flex items-center gap-3">
          <ChordDiagram chord={activeChord} instrument={instrument} />
-          <button
-            className="ml-auto text-muted-foreground text-xs underline-offset-4 hover:underline"
+          <Button
+            variant="ghost"
+            size="sm"
+            className="ml-auto text-xs text-muted-foreground"
            onClick={() => setActiveChord(null)}
          >
            close
-          </button>
+          </Button>
        </div>
      )}

--- a/app/package-lock.json
+++ b/app/package-lock.json
@@ -10,6 +10,7 @@
        "@fontsource-variable/inter": "^5.2.8",
        "@react-router/node": "7.14.0",
        "@react-router/serve": "7.14.0",
+        "@tanstack/react-query": "^5.101.2",
        "class-variance-authority": "^0.7.1",
        "clsx": "^2.1.1",
        "cmdk": "^1.1.1",
@@ -4045,6 +4046,32 @@
        "vite": "^5.2.0 || ^6 || ^7 || ^8"
      }
    },
+    "node_modules/@tanstack/query-core": {
+      "version": "5.101.2",
+      "resolved": "https://registry.npmjs.org/@tanstack/query-core/-/query-core-5.101.2.tgz",
+      "integrity": "sha512-hH5MLoJhF7KaIGd7q3xTXGXvslI+GYlM1Z/35aSHHWaCJWB7XvTSHYuV3eM7tw+aE0mT/xMro4M4Q9rCGHT0lw==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      }
+    },
+    "node_modules/@tanstack/react-query": {
+      "version": "5.101.2",
+      "resolved": "https://registry.npmjs.org/@tanstack/react-query/-/react-query-5.101.2.tgz",
+      "integrity": "sha512-seDkr6kzGzX1okaaTtZPtgA688CDPlXUz1C6xSg0ESqn04Vuc8tlrYms1s3de+znBqhPVxFRfpAfUf+6XvfPWg==",
+      "license": "MIT",
+      "dependencies": {
+        "@tanstack/query-core": "5.101.2"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      },
+      "peerDependencies": {
+        "react": "^18 || ^19"
+      }
+    },
    "node_modules/@tonaljs/abc-notation": {
      "version": "4.9.1",
      "resolved": "https://registry.npmjs.org/@tonaljs/abc-notation/-/abc-notation-4.9.1.tgz",
--- a/app/package.json
+++ b/app/package.json
@@ -14,6 +14,7 @@
    "@fontsource-variable/inter": "^5.2.8",
    "@react-router/node": "7.14.0",
    "@react-router/serve": "7.14.0",
+    "@tanstack/react-query": "^5.101.2",
    "class-variance-authority": "^0.7.1",
    "clsx": "^2.1.1",
    "cmdk": "^1.1.1",
--- a/app/react-router.config.ts
+++ b/app/react-router.config.ts
@@ -3,5 +3,5 @@ import type { Config } from "@react-router/dev/config";
 export default {
  // Config options...
  // Server-side render by default, to enable SPA mode set this to `false`
-  ssr: true,
+  ssr: false,
 } satisfies Config;
--- a/architecture.mmd
+++ b/architecture.mmd
@@ -0,0 +1,64 @@
+graph TD
+    subgraph Presentation
+        MAIN[main.rs]
+        ROUTES[routes/]
+        EXTRACT[extractors]
+        OPENAPI[OpenAPI / Scalar]
+        SPA[SPA static files]
+    end
+
+    subgraph Application
+        SONGS_UC[songs/]
+        TABS_UC[tabs/]
+        AUTH_UC[auth/]
+    end
+
+    subgraph Domain
+        MODELS[models/]
+        VO[value_objects/]
+        PORTS[ports/]
+        SERVICES[services/]
+        ERRORS[errors/]
+    end
+
+    subgraph Adapters
+        SQLITE[(SQLite)]
+        UG[UG Parser]
+        JWT[JWT + Argon2]
+    end
+
+    subgraph "Shared Crates"
+        API_TYPES[api-types]
+        INFRA[infra-wiring]
+    end
+
+    subgraph Frontend
+        REACT[React SPA]
+    end
+
+    MAIN --> ROUTES
+    MAIN --> OPENAPI
+    ROUTES --> EXTRACT
+    ROUTES --> SONGS_UC
+    ROUTES --> TABS_UC
+    ROUTES --> AUTH_UC
+    ROUTES --> API_TYPES
+
+    SONGS_UC --> PORTS
+    TABS_UC --> PORTS
+    AUTH_UC --> PORTS
+
+    PORTS --> MODELS
+    PORTS --> VO
+    PORTS --> ERRORS
+    SERVICES --> MODELS
+    SERVICES --> VO
+
+    SQLITE -.->|implements| PORTS
+    UG -.->|implements| PORTS
+    JWT -.->|implements| PORTS
+
+    MAIN --> INFRA
+    MAIN --> SPA
+    REACT -->|/api/*| ROUTES
+    SPA -->|serves| REACT
--- a/crates/adapters/auth/Cargo.toml
+++ b/crates/adapters/auth/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "auth"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+domain = { workspace = true }
+uuid = { workspace = true }
+async-trait = { workspace = true }
+chrono = { version = "0.4", features = ["serde"] }
+jsonwebtoken = "9"
+argon2 = { version = "0.5", features = ["std"] }
+rand_core = { version = "0.6", features = ["getrandom"] }
+serde = { workspace = true }
--- a/crates/adapters/auth/src/lib.rs
+++ b/crates/adapters/auth/src/lib.rs
@@ -0,0 +1,100 @@
+use std::sync::Arc;
+
+use argon2::password_hash::SaltString;
+use argon2::{Argon2, PasswordHash, PasswordHasher as ArgonHasher, PasswordVerifier};
+use async_trait::async_trait;
+use chrono::{Duration, Utc};
+use jsonwebtoken::{DecodingKey, EncodingKey, Header, Validation};
+use rand_core::OsRng;
+use serde::{Deserialize, Serialize};
+
+use domain::errors::DomainError;
+use domain::models::GeneratedToken;
+use domain::value_objects::UserId;
+
+pub struct JwtAuthService {
+    encoding_key: EncodingKey,
+    decoding_key: DecodingKey,
+    ttl_seconds: i64,
+}
+
+#[derive(Serialize, Deserialize)]
+struct Claims {
+    sub: String,
+    exp: usize,
+}
+
+impl JwtAuthService {
+    pub fn new(secret: &str, ttl_seconds: u64) -> Self {
+        Self {
+            encoding_key: EncodingKey::from_secret(secret.as_bytes()),
+            decoding_key: DecodingKey::from_secret(secret.as_bytes()),
+            ttl_seconds: ttl_seconds as i64,
+        }
+    }
+}
+
+#[async_trait]
+impl domain::ports::AuthService for JwtAuthService {
+    async fn generate_token(&self, user_id: &UserId) -> Result<GeneratedToken, DomainError> {
+        let expires_at = Utc::now() + Duration::seconds(self.ttl_seconds);
+        let claims = Claims {
+            sub: user_id.value().to_string(),
+            exp: expires_at.timestamp() as usize,
+        };
+        let token = jsonwebtoken::encode(&Header::default(), &claims, &self.encoding_key)
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+        Ok(GeneratedToken { token, expires_at })
+    }
+
+    async fn validate_token(&self, token: &str) -> Result<UserId, DomainError> {
+        let data =
+            jsonwebtoken::decode::<Claims>(token, &self.decoding_key, &Validation::default())
+                .map_err(|_| DomainError::Unauthorized("invalid or expired token".into()))?;
+        let uuid = uuid::Uuid::parse_str(&data.claims.sub)
+            .map_err(|_| DomainError::Unauthorized("invalid token subject".into()))?;
+        Ok(UserId::from_uuid(uuid))
+    }
+}
+
+pub struct Argon2PasswordHasher;
+
+#[async_trait]
+impl domain::ports::PasswordHasher for Argon2PasswordHasher {
+    async fn hash(
+        &self,
+        plain_password: &str,
+    ) -> Result<domain::value_objects::PasswordHash, DomainError> {
+        let salt = SaltString::generate(&mut OsRng);
+        let hash = Argon2::default()
+            .hash_password(plain_password.as_bytes(), &salt)
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?
+            .to_string();
+        domain::value_objects::PasswordHash::new(hash)
+    }
+
+    async fn verify(
+        &self,
+        plain_password: &str,
+        hash: &domain::value_objects::PasswordHash,
+    ) -> Result<bool, DomainError> {
+        let parsed = PasswordHash::new(hash.value())
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+        Ok(Argon2::default()
+            .verify_password(plain_password.as_bytes(), &parsed)
+            .is_ok())
+    }
+}
+
+pub fn create(
+    secret: &str,
+    ttl_seconds: u64,
+) -> (
+    Arc<dyn domain::ports::AuthService>,
+    Arc<dyn domain::ports::PasswordHasher>,
+) {
+    (
+        Arc::new(JwtAuthService::new(secret, ttl_seconds)),
+        Arc::new(Argon2PasswordHasher),
+    )
+}
--- a/crates/adapters/sqlite/Cargo.toml
+++ b/crates/adapters/sqlite/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "sqlite"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+sqlx = { workspace = true }
+uuid = { workspace = true }
+async-trait = { workspace = true }
+serde_json = { workspace = true }
+chrono = { version = "0.4", features = ["serde"] }
+domain = { workspace = true }
--- a/crates/infrastructure/persistence/migrations/001_songs.sql
+++ b/crates/infrastructure/persistence/migrations/001_songs.sql
--- a/crates/adapters/sqlite/migrations/002_users.sql
+++ b/crates/adapters/sqlite/migrations/002_users.sql
@@ -0,0 +1,7 @@
+CREATE TABLE IF NOT EXISTS users (
+    id TEXT PRIMARY KEY NOT NULL,
+    email TEXT UNIQUE NOT NULL,
+    username TEXT UNIQUE NOT NULL,
+    password_hash TEXT NOT NULL,
+    created_at TEXT NOT NULL
+);
--- a/crates/adapters/sqlite/migrations/003_refresh_sessions.sql
+++ b/crates/adapters/sqlite/migrations/003_refresh_sessions.sql
@@ -0,0 +1,11 @@
+CREATE TABLE IF NOT EXISTS refresh_sessions (
+    id TEXT PRIMARY KEY NOT NULL,
+    user_id TEXT NOT NULL,
+    token TEXT UNIQUE NOT NULL,
+    expires_at TEXT NOT NULL,
+    created_at TEXT NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_refresh_sessions_token ON refresh_sessions(token);
+CREATE INDEX IF NOT EXISTS idx_refresh_sessions_user_id ON refresh_sessions(user_id);
+CREATE INDEX IF NOT EXISTS idx_refresh_sessions_expires_at ON refresh_sessions(expires_at);
--- a/crates/adapters/sqlite/src/lib.rs
+++ b/crates/adapters/sqlite/src/lib.rs
@@ -0,0 +1,7 @@
+mod refresh_sessions;
+pub mod repository;
+mod row;
+mod search;
+mod users;
+
+pub use repository::{SqliteRepositoryFactory, SqliteSongRepository};
--- a/crates/adapters/sqlite/src/refresh_sessions.rs
+++ b/crates/adapters/sqlite/src/refresh_sessions.rs
@@ -0,0 +1,96 @@
+use async_trait::async_trait;
+use chrono::DateTime;
+use domain::errors::DomainError;
+use domain::models::RefreshSession;
+use domain::value_objects::UserId;
+
+use crate::repository::SqliteSongRepository;
+
+#[derive(sqlx::FromRow)]
+struct RefreshSessionRow {
+    id: String,
+    user_id: String,
+    token: String,
+    expires_at: String,
+    created_at: String,
+}
+
+fn row_to_session(row: RefreshSessionRow) -> Result<RefreshSession, DomainError> {
+    let id = uuid::Uuid::parse_str(&row.id)
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+    let user_id = uuid::Uuid::parse_str(&row.user_id)
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+    let expires_at = DateTime::parse_from_rfc3339(&row.expires_at)
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?
+        .to_utc();
+    let created_at = DateTime::parse_from_rfc3339(&row.created_at)
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?
+        .to_utc();
+
+    Ok(RefreshSession {
+        id,
+        user_id: UserId::from_uuid(user_id),
+        token: row.token,
+        expires_at,
+        created_at,
+    })
+}
+
+#[async_trait]
+impl domain::ports::RefreshSessionRepository for SqliteSongRepository {
+    async fn create(&self, session: &RefreshSession) -> Result<(), DomainError> {
+        sqlx::query(
+            "INSERT INTO refresh_sessions (id, user_id, token, expires_at, created_at) VALUES (?, ?, ?, ?, ?)",
+        )
+        .bind(session.id.to_string())
+        .bind(session.user_id.value().to_string())
+        .bind(&session.token)
+        .bind(session.expires_at.to_rfc3339())
+        .bind(session.created_at.to_rfc3339())
+        .execute(&self.pool)
+        .await
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+
+        Ok(())
+    }
+
+    async fn get_by_token(&self, token: &str) -> Result<Option<RefreshSession>, DomainError> {
+        let row = sqlx::query_as::<_, RefreshSessionRow>(
+            "SELECT id, user_id, token, expires_at, created_at FROM refresh_sessions WHERE token = ?",
+        )
+        .bind(token)
+        .fetch_optional(&self.pool)
+        .await
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+
+        row.map(row_to_session).transpose()
+    }
+
+    async fn revoke(&self, token: &str) -> Result<(), DomainError> {
+        sqlx::query("DELETE FROM refresh_sessions WHERE token = ?")
+            .bind(token)
+            .execute(&self.pool)
+            .await
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+        Ok(())
+    }
+
+    async fn revoke_all_for_user(&self, user_id: &UserId) -> Result<(), DomainError> {
+        sqlx::query("DELETE FROM refresh_sessions WHERE user_id = ?")
+            .bind(user_id.value().to_string())
+            .execute(&self.pool)
+            .await
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+        Ok(())
+    }
+
+    async fn delete_expired(&self) -> Result<u64, DomainError> {
+        let now = chrono::Utc::now().to_rfc3339();
+        let result = sqlx::query("DELETE FROM refresh_sessions WHERE expires_at < ?")
+            .bind(&now)
+            .execute(&self.pool)
+            .await
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+        Ok(result.rows_affected())
+    }
+}
--- a/crates/infrastructure/persistence/src/repository.rs
+++ b/crates/infrastructure/persistence/src/repository.rs
@@ -1,12 +1,13 @@
 use async_trait::async_trait;
 use domain::{
-    RepositoryError, Song, SongRepositoryPort, SongSummary, StoredSong,
-    SortField, SortOrder, song_preview_chords,
+    DomainError, Song, SongRepositoryPort, SongSummary, SortField, SortOrder, StoredSong,
+    song_preview_chords,
 };
 use sqlx::SqlitePool;
+use std::str::FromStr;
 use uuid::Uuid;

-use crate::row::{SongRow, sort_clause, row_to_summary};
+use crate::row::{SongRow, row_to_summary, sort_clause};

 #[derive(Clone)]
 pub struct SqliteSongRepository {
@@ -15,7 +16,9 @@ pub struct SqliteSongRepository {

 impl SqliteSongRepository {
    pub async fn new(database_url: &str) -> Result<Self, sqlx::Error> {
-        let pool = SqlitePool::connect(database_url).await?;
+        let opts =
+            sqlx::sqlite::SqliteConnectOptions::from_str(database_url)?.create_if_missing(true);
+        let pool = SqlitePool::connect_with(opts).await?;
        sqlx::migrate!("./migrations").run(&pool).await?;
        Ok(Self { pool })
    }
@@ -23,14 +26,14 @@ impl SqliteSongRepository {

 #[async_trait]
 impl SongRepositoryPort for SqliteSongRepository {
-    async fn save(&self, song: &Song) -> Result<StoredSong, RepositoryError> {
+    async fn save(&self, song: &Song) -> Result<StoredSong, DomainError> {
        let id = Uuid::new_v4();
        let id_str = id.to_string();
        let body = serde_json::to_string(song)
-            .map_err(|e| RepositoryError::Internal(e.to_string()))?;
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
        let preview = song_preview_chords(song);
        let preview_json = serde_json::to_string(&preview)
-            .map_err(|e| RepositoryError::Internal(e.to_string()))?;
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
        let original_key = song.meta.original_key.as_deref();

        sqlx::query(
@@ -44,12 +47,19 @@ impl SongRepositoryPort for SqliteSongRepository {
        .bind(&body)
        .execute(&self.pool)
        .await
-        .map_err(|e| RepositoryError::Internal(e.to_string()))?;
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;

-        Ok(StoredSong { id, song: song.clone() })
+        Ok(StoredSong {
+            id,
+            song: song.clone(),
+        })
    }

-    async fn list(&self, sort: SortField, order: SortOrder) -> Result<Vec<SongSummary>, RepositoryError> {
+    async fn list(
+        &self,
+        sort: SortField,
+        order: SortOrder,
+    ) -> Result<Vec<SongSummary>, DomainError> {
        let sql = format!(
            "SELECT id, title, artist, original_key, preview_chords, body FROM songs {}",
            sort_clause(sort, order)
@@ -57,41 +67,41 @@ impl SongRepositoryPort for SqliteSongRepository {
        let rows = sqlx::query_as::<_, SongRow>(&sql)
            .fetch_all(&self.pool)
            .await
-            .map_err(|e| RepositoryError::Internal(e.to_string()))?;
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;

        rows.into_iter().map(row_to_summary).collect()
    }

-    async fn get(&self, id: Uuid) -> Result<Option<Song>, RepositoryError> {
+    async fn get(&self, id: Uuid) -> Result<Option<Song>, DomainError> {
        let id_str = id.to_string();
        let row = sqlx::query_as::<_, SongRow>(
-            "SELECT id, title, artist, original_key, preview_chords, body FROM songs WHERE id = ?"
+            "SELECT id, title, artist, original_key, preview_chords, body FROM songs WHERE id = ?",
        )
        .bind(&id_str)
        .fetch_optional(&self.pool)
        .await
-        .map_err(|e| RepositoryError::Internal(e.to_string()))?;
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;

        match row {
            None => Ok(None),
            Some(r) => {
                let song: Song = serde_json::from_str(&r.body)
-                    .map_err(|e| RepositoryError::Internal(e.to_string()))?;
+                    .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
                Ok(Some(song))
            }
        }
    }

-    async fn delete(&self, id: Uuid) -> Result<(), RepositoryError> {
+    async fn delete(&self, id: Uuid) -> Result<(), DomainError> {
        let id_str = id.to_string();
        let result = sqlx::query("DELETE FROM songs WHERE id = ?")
            .bind(&id_str)
            .execute(&self.pool)
            .await
-            .map_err(|e| RepositoryError::Internal(e.to_string()))?;
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;

        if result.rows_affected() == 0 {
-            Err(RepositoryError::NotFound)
+            Err(DomainError::NotFound)
        } else {
            Ok(())
        }
@@ -103,32 +113,38 @@ impl SongRepositoryPort for SqliteSongRepository {
        title: Option<&str>,
        artist: Option<&str>,
        original_key: Option<&str>,
-    ) -> Result<SongSummary, RepositoryError> {
+    ) -> Result<SongSummary, DomainError> {
        let id_str = id.to_string();

        let row = sqlx::query_as::<_, SongRow>(
-            "SELECT id, title, artist, original_key, preview_chords, body FROM songs WHERE id = ?"
+            "SELECT id, title, artist, original_key, preview_chords, body FROM songs WHERE id = ?",
        )
        .bind(&id_str)
        .fetch_optional(&self.pool)
        .await
-        .map_err(|e| RepositoryError::Internal(e.to_string()))?
-        .ok_or(RepositoryError::NotFound)?;
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?
+        .ok_or(DomainError::NotFound)?;

        let mut song: Song = serde_json::from_str(&row.body)
-            .map_err(|e| RepositoryError::Internal(e.to_string()))?;
-        if let Some(t) = title { song.meta.title = t.to_string(); }
-        if let Some(a) = artist { song.meta.artist = a.to_string(); }
-        if let Some(k) = original_key { song.meta.original_key = Some(k.to_string()); }
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+        if let Some(t) = title {
+            song.meta.title = t.to_string();
+        }
+        if let Some(a) = artist {
+            song.meta.artist = a.to_string();
+        }
+        if let Some(k) = original_key {
+            song.meta.original_key = Some(k.to_string());
+        }
        let new_body = serde_json::to_string(&song)
-            .map_err(|e| RepositoryError::Internal(e.to_string()))?;
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;

        let new_title = title.unwrap_or(&row.title);
        let new_artist = artist.unwrap_or(&row.artist);
        let new_key: Option<&str> = original_key.or(row.original_key.as_deref());

        sqlx::query(
-            "UPDATE songs SET title = ?, artist = ?, original_key = ?, body = ? WHERE id = ?"
+            "UPDATE songs SET title = ?, artist = ?, original_key = ?, body = ? WHERE id = ?",
        )
        .bind(new_title)
        .bind(new_artist)
@@ -137,10 +153,10 @@ impl SongRepositoryPort for SqliteSongRepository {
        .bind(&id_str)
        .execute(&self.pool)
        .await
-        .map_err(|e| RepositoryError::Internal(e.to_string()))?;
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;

        let preview_chords: Vec<String> = serde_json::from_str(&row.preview_chords)
-            .map_err(|e| RepositoryError::Internal(e.to_string()))?;
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;

        Ok(SongSummary {
            id,
--- a/crates/infrastructure/persistence/src/row.rs
+++ b/crates/infrastructure/persistence/src/row.rs
@@ -1,4 +1,4 @@
-use domain::{RepositoryError, SongMeta, SongSummary, SortField, SortOrder};
+use domain::{DomainError, SongMeta, SongSummary, SortField, SortOrder};
 use uuid::Uuid;

 #[derive(sqlx::FromRow)]
@@ -13,20 +13,20 @@ pub(crate) struct SongRow {

 pub(crate) fn sort_clause(field: SortField, order: SortOrder) -> &'static str {
    match (field, order) {
-        (SortField::Title,  SortOrder::Asc)  => "ORDER BY title ASC",
-        (SortField::Title,  SortOrder::Desc) => "ORDER BY title DESC",
-        (SortField::Artist, SortOrder::Asc)  => "ORDER BY artist ASC",
+        (SortField::Title, SortOrder::Asc) => "ORDER BY title ASC",
+        (SortField::Title, SortOrder::Desc) => "ORDER BY title DESC",
+        (SortField::Artist, SortOrder::Asc) => "ORDER BY artist ASC",
        (SortField::Artist, SortOrder::Desc) => "ORDER BY artist DESC",
-        (SortField::Date,   SortOrder::Asc)  => "ORDER BY created_at ASC",
-        (SortField::Date,   SortOrder::Desc) => "ORDER BY created_at DESC",
+        (SortField::Date, SortOrder::Asc) => "ORDER BY created_at ASC",
+        (SortField::Date, SortOrder::Desc) => "ORDER BY created_at DESC",
    }
 }

-pub(crate) fn row_to_summary(row: SongRow) -> Result<SongSummary, RepositoryError> {
-    let id = Uuid::parse_str(&row.id)
-        .map_err(|e| RepositoryError::Internal(e.to_string()))?;
+pub(crate) fn row_to_summary(row: SongRow) -> Result<SongSummary, DomainError> {
+    let id =
+        Uuid::parse_str(&row.id).map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
    let preview_chords: Vec<String> = serde_json::from_str(&row.preview_chords)
-        .map_err(|e| RepositoryError::Internal(e.to_string()))?;
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
    Ok(SongSummary {
        id,
        meta: SongMeta {
--- a/crates/infrastructure/persistence/src/search.rs
+++ b/crates/infrastructure/persistence/src/search.rs
@@ -1,13 +1,21 @@
 use async_trait::async_trait;
-use domain::{RepositoryError, SongSearchPort, SongSummary, SortField, SortOrder};
+use domain::{DomainError, SongSearchPort, SongSummary, SortField, SortOrder};

 use crate::repository::SqliteSongRepository;
-use crate::row::{SongRow, sort_clause, row_to_summary};
+use crate::row::{SongRow, row_to_summary, sort_clause};

 #[async_trait]
 impl SongSearchPort for SqliteSongRepository {
-    async fn search(&self, query: &str, sort: SortField, order: SortOrder) -> Result<Vec<SongSummary>, RepositoryError> {
-        let escaped = query.replace('\\', "\\\\").replace('%', "\\%").replace('_', "\\_");
+    async fn search(
+        &self,
+        query: &str,
+        sort: SortField,
+        order: SortOrder,
+    ) -> Result<Vec<SongSummary>, DomainError> {
+        let escaped = query
+            .replace('\\', "\\\\")
+            .replace('%', "\\%")
+            .replace('_', "\\_");
        let pattern = format!("%{}%", escaped);
        let sql = format!(
            "SELECT id, title, artist, original_key, preview_chords, body FROM songs \
@@ -19,7 +27,7 @@ impl SongSearchPort for SqliteSongRepository {
            .bind(&pattern)
            .fetch_all(&self.pool)
            .await
-            .map_err(|e| RepositoryError::Internal(e.to_string()))?;
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;

        rows.into_iter().map(row_to_summary).collect()
    }
--- a/crates/adapters/sqlite/src/users.rs
+++ b/crates/adapters/sqlite/src/users.rs
@@ -0,0 +1,81 @@
+use async_trait::async_trait;
+use domain::errors::DomainError;
+use domain::models::User;
+use domain::value_objects::{Email, PasswordHash, UserId, Username};
+
+use crate::repository::SqliteSongRepository;
+
+#[derive(sqlx::FromRow)]
+struct UserRow {
+    id: String,
+    email: String,
+    username: String,
+    password_hash: String,
+}
+
+fn row_to_user(row: UserRow) -> Result<User, DomainError> {
+    let id = uuid::Uuid::parse_str(&row.id)
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+    Ok(User::from_persistence(
+        UserId::from_uuid(id),
+        Email::new(&row.email)?,
+        Username::new(&row.username)?,
+        PasswordHash::new(row.password_hash)?,
+    ))
+}
+
+#[async_trait]
+impl domain::ports::UserRepository for SqliteSongRepository {
+    async fn find_by_email(&self, email: &Email) -> Result<Option<User>, DomainError> {
+        let row = sqlx::query_as::<_, UserRow>(
+            "SELECT id, email, username, password_hash FROM users WHERE email = ?",
+        )
+        .bind(email.value())
+        .fetch_optional(&self.pool)
+        .await
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+
+        row.map(row_to_user).transpose()
+    }
+
+    async fn find_by_username(&self, username: &Username) -> Result<Option<User>, DomainError> {
+        let row = sqlx::query_as::<_, UserRow>(
+            "SELECT id, email, username, password_hash FROM users WHERE username = ?",
+        )
+        .bind(username.value())
+        .fetch_optional(&self.pool)
+        .await
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+
+        row.map(row_to_user).transpose()
+    }
+
+    async fn find_by_id(&self, id: &UserId) -> Result<Option<User>, DomainError> {
+        let row = sqlx::query_as::<_, UserRow>(
+            "SELECT id, email, username, password_hash FROM users WHERE id = ?",
+        )
+        .bind(id.value().to_string())
+        .fetch_optional(&self.pool)
+        .await
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+
+        row.map(row_to_user).transpose()
+    }
+
+    async fn save(&self, user: &User) -> Result<(), DomainError> {
+        let now = chrono::Utc::now().to_rfc3339();
+        sqlx::query(
+            "INSERT INTO users (id, email, username, password_hash, created_at) VALUES (?, ?, ?, ?, ?)",
+        )
+        .bind(user.id().value().to_string())
+        .bind(user.email().value())
+        .bind(user.username().value())
+        .bind(user.password_hash().value())
+        .bind(&now)
+        .execute(&self.pool)
+        .await
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+
+        Ok(())
+    }
+}
--- a/crates/infrastructure/ug-parser/Cargo.toml
+++ b/crates/infrastructure/ug-parser/Cargo.toml
@@ -4,9 +4,7 @@ version = "0.1.0"
 edition = "2024"

 [dependencies]
-domain = { path = "../../domain" }
-anyhow = { workspace = true }
-thiserror = { workspace = true }
+domain = { workspace = true }
 tokio = { workspace = true }
 reqwest = { workspace = true }
 scraper = { workspace = true }
--- a/crates/adapters/ug-parser/src/fetcher.rs
+++ b/crates/adapters/ug-parser/src/fetcher.rs
@@ -0,0 +1,52 @@
+use async_trait::async_trait;
+use domain::{FetchError, TabFetcherPort, TabSource};
+
+pub struct UgTabFetcher {
+    client: reqwest::Client,
+}
+
+impl UgTabFetcher {
+    pub fn new() -> Self {
+        Self {
+            client: reqwest::Client::new(),
+        }
+    }
+}
+
+impl Default for UgTabFetcher {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[async_trait]
+impl TabFetcherPort for UgTabFetcher {
+    async fn fetch(&self, source: TabSource) -> Result<String, FetchError> {
+        match source {
+            TabSource::File(path) => Ok(tokio::fs::read_to_string(&path).await?),
+            TabSource::Url(url) => {
+                let resp = self
+                    .client
+                    .get(&url)
+                    .send()
+                    .await
+                    .map_err(|e| FetchError::Network(e.to_string()))?;
+                let content_type = resp
+                    .headers()
+                    .get(reqwest::header::CONTENT_TYPE)
+                    .and_then(|v| v.to_str().ok())
+                    .unwrap_or("");
+                if !content_type.contains("text/html") {
+                    return Err(FetchError::InvalidContentType);
+                }
+                resp.text()
+                    .await
+                    .map_err(|e| FetchError::Network(e.to_string()))
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+#[path = "tests/fetcher.rs"]
+mod tests;
--- a/crates/infrastructure/ug-parser/src/lib.rs
+++ b/crates/infrastructure/ug-parser/src/lib.rs
--- a/crates/infrastructure/ug-parser/src/parser.rs
+++ b/crates/infrastructure/ug-parser/src/parser.rs
@@ -127,6 +127,14 @@ impl UgHtmlParser {
                continue;
            }

+            // Plain-text chord line (UG sometimes drops spans for later sections)
+            if let Some(parsed) = Self::try_parse_plain_chord_line(trimmed)
+                && !parsed.is_empty()
+            {
+                pending_chords = parsed;
+                continue;
+            }
+
            // Lyric line
            if let Some(sec) = current_section.as_mut() {
                sec.lines.push(LyricLine {
@@ -159,6 +167,30 @@ impl UgHtmlParser {
        }
    }

+    /// Detect a plain-text chord line: every non-whitespace token must be a valid chord.
+    /// Returns None if the line contains non-chord words (i.e. it's a lyric line).
+    pub(crate) fn try_parse_plain_chord_line(line: &str) -> Option<Vec<ChordPosition>> {
+        let tokens: Vec<&str> = line.split_whitespace().collect();
+        if tokens.is_empty() {
+            return None;
+        }
+        let mut chords = Vec::new();
+        let mut pos = 0;
+
+        for token in &tokens {
+            let token_start = line[pos..].find(token).map(|i| pos + i)?;
+            pos = token_start + token.len();
+
+            let chord = Chord::parse(token)?;
+            chords.push(ChordPosition {
+                offset: token_start,
+                chord,
+            });
+        }
+
+        Some(chords)
+    }
+
    /// Parse a chord line (raw HTML) into chord positions.
    /// Walks text nodes and span[data-name] elements in order to compute offsets.
    fn parse_chord_line(line_html: &str) -> Vec<ChordPosition> {
@@ -199,65 +231,5 @@ impl TabParserPort for UgHtmlParser {
 }

 #[cfg(test)]
-mod tests {
-    use super::*;
-    use domain::TabParserPort;
-
-    fn sample_html(name: &str) -> String {
-        let path = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
-            .parent()
-            .unwrap()
-            .parent()
-            .unwrap()
-            .parent()
-            .unwrap()
-            .join(format!("samples/{}", name));
-        std::fs::read_to_string(path).unwrap()
-    }
-
-    #[test]
-    fn parses_artist_and_title() {
-        let parser = UgHtmlParser;
-        let html = sample_html("A DROP IN THE OCEAN.html");
-        let song = parser.parse(&html).unwrap();
-        assert_eq!(song.meta.artist, "Ron Pope");
-        assert_eq!(song.meta.title, "A Drop In The Ocean");
-    }
-
-    #[test]
-    fn capo_is_none_when_no_capo() {
-        let parser = UgHtmlParser;
-        let html = sample_html("A DROP IN THE OCEAN.html");
-        let song = parser.parse(&html).unwrap();
-        assert_eq!(song.meta.capo, None);
-    }
-
-    #[test]
-    fn parses_sections() {
-        let parser = UgHtmlParser;
-        let html = sample_html("A DROP IN THE OCEAN.html");
-        let song = parser.parse(&html).unwrap();
-        assert!(
-            song.sections.len() >= 3,
-            "expected >=3 sections, got {}",
-            song.sections.len()
-        );
-        assert_eq!(song.sections[0].kind, domain::SectionKind::Chorus);
-    }
-
-    #[test]
-    fn parses_chord_positions() {
-        let parser = UgHtmlParser;
-        let html = sample_html("A DROP IN THE OCEAN.html");
-        let song = parser.parse(&html).unwrap();
-        // First section, first line: "A drop in the ocean,"
-        // Chord "Em" should be at offset 0 (or small offset from leading whitespace)
-        let first_line = &song.sections[0].lines[0];
-        assert_eq!(first_line.text, "A drop in the ocean,");
-        assert!(
-            first_line.chords[0].chord.name(true) == "Em",
-            "expected Em chord, got {}",
-            first_line.chords[0].chord.name(true)
-        );
-    }
-}
+#[path = "tests/parser.rs"]
+mod tests;
--- a/crates/adapters/ug-parser/src/tests/fetcher.rs
+++ b/crates/adapters/ug-parser/src/tests/fetcher.rs
@@ -0,0 +1,19 @@
+use super::*;
+use domain::TabSource;
+use std::path::PathBuf;
+
+#[tokio::test]
+async fn fetch_local_file() {
+    let fetcher = UgTabFetcher::new();
+    let path = PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .unwrap()
+        .parent()
+        .unwrap()
+        .parent()
+        .unwrap()
+        .join("samples/drop_in_the_ocean.html");
+    let html = fetcher.fetch(TabSource::File(path)).await.unwrap();
+    assert!(html.contains("[Chorus]"));
+    assert!(html.contains("data-name=\"Em\""));
+}
--- a/crates/adapters/ug-parser/src/tests/parser.rs
+++ b/crates/adapters/ug-parser/src/tests/parser.rs
@@ -0,0 +1,77 @@
+use super::*;
+use domain::TabParserPort;
+
+fn sample_html(name: &str) -> String {
+    let path = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .unwrap()
+        .parent()
+        .unwrap()
+        .parent()
+        .unwrap()
+        .join(format!("samples/{}", name));
+    std::fs::read_to_string(path).unwrap()
+}
+
+#[test]
+fn parses_artist_and_title() {
+    let parser = UgHtmlParser;
+    let html = sample_html("drop_in_the_ocean.html");
+    let song = parser.parse(&html).unwrap();
+    assert_eq!(song.meta.artist, "Ron Pope");
+    assert_eq!(song.meta.title, "A Drop In The Ocean");
+}
+
+#[test]
+fn capo_is_none_when_no_capo() {
+    let parser = UgHtmlParser;
+    let html = sample_html("drop_in_the_ocean.html");
+    let song = parser.parse(&html).unwrap();
+    assert_eq!(song.meta.capo, None);
+}
+
+#[test]
+fn parses_sections() {
+    let parser = UgHtmlParser;
+    let html = sample_html("drop_in_the_ocean.html");
+    let song = parser.parse(&html).unwrap();
+    assert!(
+        song.sections.len() >= 3,
+        "expected >=3 sections, got {}",
+        song.sections.len()
+    );
+    assert_eq!(song.sections[0].kind, domain::SectionKind::Chorus);
+}
+
+#[test]
+fn parses_chord_positions() {
+    let parser = UgHtmlParser;
+    let html = sample_html("drop_in_the_ocean.html");
+    let song = parser.parse(&html).unwrap();
+    let first_line = &song.sections[0].lines[0];
+    assert_eq!(first_line.text, "A drop in the ocean,");
+    assert!(
+        first_line.chords[0].chord.name(true) == "Em",
+        "expected Em chord, got {}",
+        first_line.chords[0].chord.name(true)
+    );
+}
+
+#[test]
+fn parses_plain_text_chord_lines() {
+    let parser = UgHtmlParser;
+    let html = sample_html("drop_in_the_ocean.html");
+    let song = parser.parse(&html).unwrap();
+    let last_section = song.sections.last().unwrap();
+    let has_chords = last_section.lines.iter().any(|l| !l.chords.is_empty());
+    assert!(
+        has_chords,
+        "last section should have chords parsed from plain text"
+    );
+}
+
+#[test]
+fn plain_chord_detection_does_not_eat_lyrics() {
+    assert!(UgHtmlParser::try_parse_plain_chord_line("A drop in the ocean").is_none());
+    assert!(UgHtmlParser::try_parse_plain_chord_line("Am       G  D").is_some());
+}
--- a/crates/api-types/Cargo.toml
+++ b/crates/api-types/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "api-types"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+serde = { workspace = true }
+utoipa = { version = "5", features = ["axum_extras"] }
--- a/crates/api-types/src/lib.rs
+++ b/crates/api-types/src/lib.rs
@@ -0,0 +1,71 @@
+use serde::{Deserialize, Serialize};
+use utoipa::{IntoParams, ToSchema};
+
+#[derive(Deserialize, ToSchema)]
+pub struct ParseRequest {
+    pub source: Option<String>,
+    pub html: Option<String>,
+}
+
+#[derive(Serialize, ToSchema)]
+pub struct ErrorResponse {
+    pub error: String,
+}
+
+#[derive(Deserialize, ToSchema, IntoParams)]
+pub struct ListQuery {
+    pub q: Option<String>,
+    pub sort: Option<String>,
+    pub order: Option<String>,
+}
+
+#[derive(Deserialize, ToSchema)]
+pub struct UpdateSongRequest {
+    pub title: Option<String>,
+    pub artist: Option<String>,
+    pub original_key: Option<String>,
+}
+
+#[derive(Deserialize, ToSchema, IntoParams)]
+pub struct GetSongQuery {
+    pub apply_capo: Option<bool>,
+    pub transpose: Option<i8>,
+}
+
+#[derive(Deserialize, ToSchema)]
+pub struct LoginRequest {
+    pub email: String,
+    pub password: String,
+}
+
+#[derive(Serialize, ToSchema)]
+pub struct LoginResponse {
+    pub token: String,
+    pub refresh_token: String,
+    pub user_id: String,
+    pub expires_at: String,
+}
+
+#[derive(Deserialize, ToSchema)]
+pub struct RegisterRequest {
+    pub email: String,
+    pub username: String,
+    pub password: String,
+}
+
+#[derive(Deserialize, ToSchema)]
+pub struct RefreshRequest {
+    pub refresh_token: String,
+}
+
+#[derive(Serialize, ToSchema)]
+pub struct RefreshResponse {
+    pub token: String,
+    pub refresh_token: String,
+    pub expires_at: String,
+}
+
+#[derive(Deserialize, ToSchema)]
+pub struct LogoutRequest {
+    pub refresh_token: String,
+}
--- a/crates/api/Cargo.toml
+++ b/crates/api/Cargo.toml
@@ -1,27 +0,0 @@
-[package]
-name = "api"
-version = "0.1.0"
-edition = "2024"
-
-[dependencies]
-anyhow = { workspace = true }
-axum = { version = "0.8.8", features = ["macros"] }
-serde = { workspace = true }
-serde_json = { workspace = true }
-thiserror = { workspace = true }
-tokio = { workspace = true }
-tower-http = { version = "0.6.8", features = [
-    "cors",
-    "fs",
-    "trace",
-    "tracing",
-] }
-tracing = { workspace = true }
-tracing-subscriber = { workspace = true }
-uuid = { workspace = true }
-rand = { workspace = true }
-
-persistence = { path = "../infrastructure/persistence" }
-common = { path = "../common" }
-domain = { path = "../domain" }
-ug-parser = { path = "../infrastructure/ug-parser" }
--- a/crates/api/src/config.rs
+++ b/crates/api/src/config.rs
@@ -1,52 +0,0 @@
-use std::env;
-
-#[derive(Debug)]
-pub struct Config {
-    pub database_url: String,
-    pub host: String,
-    pub port: u16,
-    /// Parsed CORS origin policy
-    pub cors_origins: CorsOrigins,
-}
-
-#[derive(Debug)]
-pub enum CorsOrigins {
-    /// Allow any origin (`CORS_ALLOWED_ORIGINS=*`)
-    Any,
-    /// Allow specific origins (`CORS_ALLOWED_ORIGINS=https://a.com,https://b.com`)
-    List(Vec<String>),
-}
-
-impl Config {
-    pub fn from_env() -> Self {
-        let database_url = env::var("DATABASE_URL")
-            .unwrap_or_else(|_| "sqlite://./pocket-chords.db".into());
-
-        let host = env::var("HOST").unwrap_or_else(|_| "0.0.0.0".into());
-
-        let port = env::var("PORT")
-            .ok()
-            .and_then(|v| v.parse::<u16>().ok())
-            .unwrap_or(8000);
-
-        let cors_origins = match env::var("CORS_ALLOWED_ORIGINS")
-            .unwrap_or_else(|_| "*".into())
-            .trim()
-            .to_string()
-        {
-            s if s == "*" => CorsOrigins::Any,
-            s => CorsOrigins::List(
-                s.split(',')
-                    .map(|o| o.trim().to_string())
-                    .filter(|o| !o.is_empty())
-                    .collect(),
-            ),
-        };
-
-        Self { database_url, host, port, cors_origins }
-    }
-
-    pub fn bind_addr(&self) -> String {
-        format!("{}:{}", self.host, self.port)
-    }
-}
--- a/crates/api/src/main.rs
+++ b/crates/api/src/main.rs
@@ -1,63 +0,0 @@
-mod config;
-mod routes;
-
-use axum::{Router, http::HeaderValue, routing::{get, post}};
-use common::{SongSearchService, SongService};
-use config::{Config, CorsOrigins};
-use persistence::SqliteRepositoryFactory;
-use routes::songs::{create_song, delete_song, get_song, list_songs, update_song};
-use routes::tabs::{AppState, parse_tab};
-use std::sync::Arc;
-use tower_http::cors::{Any, CorsLayer};
-use ug_parser::{UgHtmlParser, UgTabFetcher};
-
-#[tokio::main]
-async fn main() {
-    tracing_subscriber::fmt::init();
-
-    let config = Config::from_env();
-    tracing::info!(?config, "starting with config");
-
-    let repo = SqliteRepositoryFactory::create(&config.database_url)
-        .await
-        .expect("failed to connect to database");
-    let songs = SongService::new(Box::new(repo.clone()));
-    let search = SongSearchService::new(Box::new(repo));
-
-    let state = Arc::new(AppState {
-        fetcher: Box::new(UgTabFetcher::new()),
-        parser: Box::new(UgHtmlParser),
-        songs,
-        search,
-    });
-
-    let cors = match config.cors_origins {
-        CorsOrigins::Any => CorsLayer::new()
-            .allow_origin(Any)
-            .allow_methods(Any)
-            .allow_headers(Any),
-        CorsOrigins::List(ref origins) => {
-            let parsed: Vec<HeaderValue> = origins
-                .iter()
-                .map(|o| o.parse().unwrap_or_else(|_| panic!("invalid CORS origin: {o}")))
-                .collect();
-            CorsLayer::new()
-                .allow_origin(parsed)
-                .allow_methods(Any)
-                .allow_headers(Any)
-        }
-    };
-
-    let app = Router::new()
-        .route("/tabs/parse", post(parse_tab))
-        .route("/songs", post(create_song).get(list_songs))
-        .route("/songs/{id}", get(get_song).delete(delete_song).patch(update_song))
-        .layer(cors)
-        .with_state(state);
-
-    let addr = config.bind_addr();
-    let listener = tokio::net::TcpListener::bind(&addr).await
-        .unwrap_or_else(|e| panic!("failed to bind {addr}: {e}"));
-    tracing::info!("listening on {}", listener.local_addr().unwrap());
-    axum::serve(listener, app).await.unwrap();
-}
--- a/crates/api/src/routes/songs.rs
+++ b/crates/api/src/routes/songs.rs
@@ -1,142 +0,0 @@
-use axum::{
-    extract::{Path, Query, State},
-    http::StatusCode,
-    Json,
-};
-use domain::{ChordTransposer, RepositoryError, SortField, SortOrder};
-use serde::Deserialize;
-use std::sync::Arc;
-use uuid::Uuid;
-
-#[derive(Deserialize)]
-pub struct ListQuery {
-    pub q: Option<String>,
-    pub sort: Option<String>,
-    pub order: Option<String>,
-}
-
-use crate::routes::tabs::{AppState, ErrorResponse, ParseRequest, resolve_html};
-
-pub async fn create_song(
-    State(state): State<Arc<AppState>>,
-    Json(body): Json<ParseRequest>,
-) -> Result<Json<domain::StoredSong>, (StatusCode, Json<ErrorResponse>)> {
-    let html = resolve_html(&state, body).await.map_err(|e| {
-        (StatusCode::BAD_REQUEST, Json(ErrorResponse { error: e }))
-    })?;
-
-    let song = state.parser.parse(&html).map_err(|e| {
-        (StatusCode::UNPROCESSABLE_ENTITY, Json(ErrorResponse { error: e.to_string() }))
-    })?;
-
-    let stored = state.songs.save(&song).await.map_err(|e| {
-        (StatusCode::INTERNAL_SERVER_ERROR, Json(ErrorResponse { error: e.to_string() }))
-    })?;
-
-    Ok(Json(stored))
-}
-
-pub async fn list_songs(
-    State(state): State<Arc<AppState>>,
-    Query(params): Query<ListQuery>,
-) -> Result<Json<Vec<domain::SongSummary>>, (StatusCode, Json<ErrorResponse>)> {
-    let sort = match params.sort.as_deref() {
-        Some("title") => SortField::Title,
-        Some("artist") => SortField::Artist,
-        _ => SortField::Date,
-    };
-    let order = match params.order.as_deref() {
-        Some("asc") => SortOrder::Asc,
-        _ => SortOrder::Desc,
-    };
-    let result = if let Some(q) = params.q.filter(|s| !s.is_empty()) {
-        state.search.search(&q, sort, order).await
-    } else {
-        state.songs.list(sort, order).await
-    };
-    result
-        .map(Json)
-        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, Json(ErrorResponse { error: e.to_string() })))
-}
-
-#[derive(serde::Deserialize)]
-pub struct UpdateSongRequest {
-    pub title: Option<String>,
-    pub artist: Option<String>,
-    pub original_key: Option<String>,
-}
-
-pub async fn update_song(
-    State(state): State<Arc<AppState>>,
-    Path(id): Path<String>,
-    Json(body): Json<UpdateSongRequest>,
-) -> Result<Json<domain::SongSummary>, (StatusCode, Json<ErrorResponse>)> {
-    let uuid = Uuid::parse_str(&id).map_err(|_| {
-        (StatusCode::BAD_REQUEST, Json(ErrorResponse { error: "Invalid ID".into() }))
-    })?;
-
-    state.songs
-        .update_meta(
-            uuid,
-            body.title.as_deref(),
-            body.artist.as_deref(),
-            body.original_key.as_deref(),
-        )
-        .await
-        .map(Json)
-        .map_err(|e| match e {
-            domain::RepositoryError::NotFound =>
-                (StatusCode::NOT_FOUND, Json(ErrorResponse { error: "Not found".into() })),
-            e => (StatusCode::INTERNAL_SERVER_ERROR, Json(ErrorResponse { error: e.to_string() })),
-        })
-}
-
-#[derive(Deserialize)]
-pub struct GetSongQuery {
-    pub apply_capo: Option<bool>,
-}
-
-pub async fn get_song(
-    State(state): State<Arc<AppState>>,
-    Path(id): Path<String>,
-    Query(params): Query<GetSongQuery>,
-) -> Result<Json<domain::Song>, (StatusCode, Json<ErrorResponse>)> {
-    let uuid = Uuid::parse_str(&id).map_err(|_| {
-        (StatusCode::BAD_REQUEST, Json(ErrorResponse { error: "Invalid ID".into() }))
-    })?;
-
-    let song = match state.songs.get(uuid).await {
-        Ok(Some(s)) => s,
-        Ok(None) => return Err((StatusCode::NOT_FOUND, Json(ErrorResponse { error: "Not found".into() }))),
-        Err(e) => return Err((StatusCode::INTERNAL_SERVER_ERROR, Json(ErrorResponse { error: e.to_string() }))),
-    };
-
-    let song = if params.apply_capo.unwrap_or(false) {
-        if let Some(capo) = song.meta.capo {
-            ChordTransposer.transpose_song(&song, capo as i8)
-        } else {
-            song
-        }
-    } else {
-        song
-    };
-
-    Ok(Json(song))
-}
-
-pub async fn delete_song(
-    State(state): State<Arc<AppState>>,
-    Path(id): Path<String>,
-) -> Result<StatusCode, (StatusCode, Json<ErrorResponse>)> {
-    let uuid = Uuid::parse_str(&id).map_err(|_| {
-        (StatusCode::BAD_REQUEST, Json(ErrorResponse { error: "Invalid ID".into() }))
-    })?;
-
-    match state.songs.delete(uuid).await {
-        Ok(()) => Ok(StatusCode::NO_CONTENT),
-        Err(RepositoryError::NotFound) => {
-            Err((StatusCode::NOT_FOUND, Json(ErrorResponse { error: "Not found".into() })))
-        }
-        Err(e) => Err((StatusCode::INTERNAL_SERVER_ERROR, Json(ErrorResponse { error: e.to_string() }))),
-    }
-}
--- a/crates/api/src/routes/tabs.rs
+++ b/crates/api/src/routes/tabs.rs
@@ -1,53 +0,0 @@
-use axum::{extract::State, http::StatusCode, Json};
-use domain::{TabFetcherPort, TabParserPort, TabSource};
-use serde::{Deserialize, Serialize};
-use std::{path::PathBuf, sync::Arc};
-
-pub struct AppState {
-    pub fetcher: Box<dyn TabFetcherPort>,
-    pub parser: Box<dyn TabParserPort>,
-    pub songs: common::SongService,
-    pub search: common::SongSearchService,
-}
-
-#[derive(Deserialize)]
-pub struct ParseRequest {
-    pub source: Option<String>,
-    pub html: Option<String>,
-}
-
-#[derive(Serialize)]
-pub struct ErrorResponse {
-    pub error: String,
-}
-
-pub async fn resolve_html(state: &AppState, body: ParseRequest) -> Result<String, String> {
-    if let Some(raw_html) = body.html {
-        Ok(raw_html)
-    } else if let Some(source) = body.source {
-        let tab_source = if source.starts_with("file://") {
-            let path = source.trim_start_matches("file://");
-            TabSource::File(PathBuf::from(path))
-        } else {
-            TabSource::Url(source)
-        };
-        state.fetcher.fetch(tab_source).await.map_err(|e| e.to_string())
-    } else {
-        Err("Provide either 'source' or 'html'".into())
-    }
-}
-
-pub async fn parse_tab(
-    State(state): State<Arc<AppState>>,
-    Json(body): Json<ParseRequest>,
-) -> Result<Json<domain::Song>, (StatusCode, Json<ErrorResponse>)> {
-    let html = resolve_html(&state, body).await.map_err(|e| {
-        (StatusCode::BAD_REQUEST, Json(ErrorResponse { error: e }))
-    })?;
-
-    let song = state.parser.parse(&html).map_err(|e| {
-        (StatusCode::UNPROCESSABLE_ENTITY, Json(ErrorResponse { error: e.to_string() }))
-    })?;
-
-    Ok(Json(song))
-}
--- a/crates/application/.gitignore
+++ b/crates/application/.gitignore
--- a/crates/application/Cargo.toml
+++ b/crates/application/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "application"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+uuid = { workspace = true }
+tracing = { workspace = true }
+chrono = { version = "0.4", features = ["serde"] }
+domain = { workspace = true }
--- a/crates/application/src/auth/commands.rs
+++ b/crates/application/src/auth/commands.rs
@@ -0,0 +1,18 @@
+pub struct RegisterCommand {
+    pub email: String,
+    pub username: String,
+    pub password: String,
+}
+
+pub struct LoginCommand {
+    pub email: String,
+    pub password: String,
+}
+
+pub struct RefreshCommand {
+    pub refresh_token: String,
+}
+
+pub struct LogoutCommand {
+    pub refresh_token: String,
+}
--- a/crates/application/src/auth/deps.rs
+++ b/crates/application/src/auth/deps.rs
@@ -0,0 +1,27 @@
+use std::sync::Arc;
+
+use domain::ports::{AuthService, PasswordHasher, RefreshSessionRepository, UserRepository};
+
+pub struct RegisterDeps {
+    pub user_repo: Arc<dyn UserRepository>,
+    pub password_hasher: Arc<dyn PasswordHasher>,
+    pub allow_registration: bool,
+}
+
+pub struct LoginDeps {
+    pub user_repo: Arc<dyn UserRepository>,
+    pub password_hasher: Arc<dyn PasswordHasher>,
+    pub auth_service: Arc<dyn AuthService>,
+    pub refresh_repo: Arc<dyn RefreshSessionRepository>,
+    pub refresh_ttl_seconds: u64,
+}
+
+pub struct RefreshDeps {
+    pub auth_service: Arc<dyn AuthService>,
+    pub refresh_repo: Arc<dyn RefreshSessionRepository>,
+    pub refresh_ttl_seconds: u64,
+}
+
+pub struct LogoutDeps {
+    pub refresh_repo: Arc<dyn RefreshSessionRepository>,
+}
--- a/crates/application/src/auth/login.rs
+++ b/crates/application/src/auth/login.rs
@@ -0,0 +1,55 @@
+use chrono::{Duration, Utc};
+use domain::errors::DomainError;
+use domain::models::RefreshSession;
+use domain::value_objects::{Email, UserId};
+use uuid::Uuid;
+
+use super::commands::LoginCommand;
+use super::deps::LoginDeps;
+
+pub struct LoginResult {
+    pub access_token: String,
+    pub refresh_token: String,
+    pub user_id: UserId,
+    pub expires_at: String,
+}
+
+pub async fn execute(deps: &LoginDeps, cmd: LoginCommand) -> Result<LoginResult, DomainError> {
+    let email = Email::new(&cmd.email)?;
+
+    let user = deps.user_repo.find_by_email(&email).await?.ok_or_else(|| {
+        tracing::warn!(email = cmd.email, "login attempt with unknown email");
+        DomainError::Unauthorized("invalid credentials".into())
+    })?;
+
+    let valid = deps
+        .password_hasher
+        .verify(&cmd.password, user.password_hash())
+        .await?;
+    if !valid {
+        tracing::warn!(email = cmd.email, "login attempt with wrong password");
+        return Err(DomainError::Unauthorized("invalid credentials".into()));
+    }
+
+    let generated = deps.auth_service.generate_token(user.id()).await?;
+
+    let refresh_token = Uuid::new_v4().to_string();
+    let refresh_expires = Utc::now() + Duration::seconds(deps.refresh_ttl_seconds as i64);
+    let session = RefreshSession {
+        id: Uuid::new_v4(),
+        user_id: *user.id(),
+        token: refresh_token.clone(),
+        expires_at: refresh_expires,
+        created_at: Utc::now(),
+    };
+    deps.refresh_repo.create(&session).await?;
+
+    tracing::info!(user_id = %user.id().value(), "user logged in");
+
+    Ok(LoginResult {
+        access_token: generated.token,
+        refresh_token,
+        user_id: *user.id(),
+        expires_at: generated.expires_at.to_rfc3339(),
+    })
+}
--- a/crates/application/src/auth/logout.rs
+++ b/crates/application/src/auth/logout.rs
@@ -0,0 +1,9 @@
+use domain::errors::DomainError;
+
+use super::commands::LogoutCommand;
+use super::deps::LogoutDeps;
+
+pub async fn execute(deps: &LogoutDeps, cmd: LogoutCommand) -> Result<(), DomainError> {
+    tracing::debug!("user logged out");
+    deps.refresh_repo.revoke(&cmd.refresh_token).await
+}
--- a/crates/application/src/auth/mod.rs
+++ b/crates/application/src/auth/mod.rs
@@ -0,0 +1,6 @@
+pub mod commands;
+pub mod deps;
+pub mod login;
+pub mod logout;
+pub mod refresh;
+pub mod register;
--- a/crates/application/src/auth/refresh.rs
+++ b/crates/application/src/auth/refresh.rs
@@ -0,0 +1,52 @@
+use chrono::{Duration, Utc};
+use domain::errors::DomainError;
+use domain::models::RefreshSession;
+use uuid::Uuid;
+
+use super::commands::RefreshCommand;
+use super::deps::RefreshDeps;
+
+pub struct RefreshResult {
+    pub access_token: String,
+    pub refresh_token: String,
+    pub expires_at: String,
+}
+
+pub async fn execute(
+    deps: &RefreshDeps,
+    cmd: RefreshCommand,
+) -> Result<RefreshResult, DomainError> {
+    let session = deps
+        .refresh_repo
+        .get_by_token(&cmd.refresh_token)
+        .await?
+        .ok_or_else(|| DomainError::Unauthorized("invalid refresh token".into()))?;
+
+    if session.expires_at < Utc::now() {
+        deps.refresh_repo.revoke(&cmd.refresh_token).await?;
+        return Err(DomainError::Unauthorized("refresh token expired".into()));
+    }
+
+    deps.refresh_repo.revoke(&cmd.refresh_token).await?;
+
+    let generated = deps.auth_service.generate_token(&session.user_id).await?;
+
+    let new_refresh_token = Uuid::new_v4().to_string();
+    let refresh_expires = Utc::now() + Duration::seconds(deps.refresh_ttl_seconds as i64);
+    let new_session = RefreshSession {
+        id: Uuid::new_v4(),
+        user_id: session.user_id,
+        token: new_refresh_token.clone(),
+        expires_at: refresh_expires,
+        created_at: Utc::now(),
+    };
+    deps.refresh_repo.create(&new_session).await?;
+
+    tracing::debug!(user_id = %session.user_id.value(), "token refreshed");
+
+    Ok(RefreshResult {
+        access_token: generated.token,
+        refresh_token: new_refresh_token,
+        expires_at: generated.expires_at.to_rfc3339(),
+    })
+}
--- a/crates/application/src/auth/register.rs
+++ b/crates/application/src/auth/register.rs
@@ -0,0 +1,38 @@
+use domain::errors::DomainError;
+use domain::models::User;
+use domain::value_objects::{Email, Password, Username};
+
+use super::commands::RegisterCommand;
+use super::deps::RegisterDeps;
+
+pub async fn execute(deps: &RegisterDeps, cmd: RegisterCommand) -> Result<(), DomainError> {
+    if !deps.allow_registration {
+        tracing::warn!("registration attempt while disabled");
+        return Err(DomainError::Unauthorized("registration is disabled".into()));
+    }
+
+    let password = Password::new(&cmd.password)?;
+    let email = Email::new(&cmd.email)?;
+    let username = Username::new(&cmd.username)?;
+
+    if deps.user_repo.find_by_email(&email).await?.is_some() {
+        return Err(DomainError::ValidationError(
+            "email already registered".into(),
+        ));
+    }
+
+    if deps.user_repo.find_by_username(&username).await?.is_some() {
+        return Err(DomainError::ValidationError(
+            "username already taken".into(),
+        ));
+    }
+
+    let hash = deps.password_hasher.hash(password.value()).await?;
+    let user = User::new(email, username, hash);
+
+    tracing::info!(user_id = %user.id().value(), "new user registered");
+
+    deps.user_repo.save(&user).await?;
+
+    Ok(())
+}
--- a/crates/application/src/lib.rs
+++ b/crates/application/src/lib.rs
@@ -1,2 +1,3 @@
+pub mod auth;
 pub mod songs;
 pub mod tabs;
--- a/crates/application/src/songs/commands.rs
+++ b/crates/application/src/songs/commands.rs
@@ -0,0 +1,17 @@
+use domain::models::Song;
+use uuid::Uuid;
+
+pub struct SaveSongCommand {
+    pub song: Song,
+}
+
+pub struct DeleteSongCommand {
+    pub id: Uuid,
+}
+
+pub struct UpdateSongMetaCommand {
+    pub id: Uuid,
+    pub title: Option<String>,
+    pub artist: Option<String>,
+    pub original_key: Option<String>,
+}
--- a/crates/application/src/songs/delete_song.rs
+++ b/crates/application/src/songs/delete_song.rs
@@ -0,0 +1,10 @@
+use domain::errors::DomainError;
+
+use super::commands::DeleteSongCommand;
+use super::deps::SongCommandDeps;
+
+pub async fn execute(deps: &SongCommandDeps, cmd: DeleteSongCommand) -> Result<(), DomainError> {
+    deps.repo.delete(cmd.id).await?;
+    tracing::debug!(id = %cmd.id, "song deleted");
+    Ok(())
+}
--- a/crates/application/src/songs/deps.rs
+++ b/crates/application/src/songs/deps.rs
@@ -0,0 +1,11 @@
+use domain::ports::{SongRepositoryPort, SongSearchPort};
+use std::sync::Arc;
+
+pub struct SongCommandDeps {
+    pub repo: Arc<dyn SongRepositoryPort>,
+}
+
+pub struct SongQueryDeps {
+    pub repo: Arc<dyn SongRepositoryPort>,
+    pub search: Arc<dyn SongSearchPort>,
+}
--- a/crates/application/src/songs/get_song.rs
+++ b/crates/application/src/songs/get_song.rs
@@ -0,0 +1,12 @@
+use domain::errors::DomainError;
+use domain::models::Song;
+
+use super::deps::SongQueryDeps;
+use super::queries::GetSongQuery;
+
+pub async fn execute(
+    deps: &SongQueryDeps,
+    query: GetSongQuery,
+) -> Result<Option<Song>, DomainError> {
+    deps.repo.get(query.id).await
+}
--- a/crates/application/src/songs/list_songs.rs
+++ b/crates/application/src/songs/list_songs.rs
@@ -0,0 +1,12 @@
+use domain::errors::DomainError;
+use domain::models::SongSummary;
+
+use super::deps::SongQueryDeps;
+use super::queries::ListSongsQuery;
+
+pub async fn execute(
+    deps: &SongQueryDeps,
+    query: ListSongsQuery,
+) -> Result<Vec<SongSummary>, DomainError> {
+    deps.repo.list(query.sort, query.order).await
+}
--- a/crates/application/src/songs/mod.rs
+++ b/crates/application/src/songs/mod.rs
@@ -0,0 +1,9 @@
+pub mod commands;
+pub mod delete_song;
+pub mod deps;
+pub mod get_song;
+pub mod list_songs;
+pub mod queries;
+pub mod save_song;
+pub mod search_songs;
+pub mod update_meta;
--- a/crates/application/src/songs/queries.rs
+++ b/crates/application/src/songs/queries.rs
@@ -0,0 +1,17 @@
+use domain::value_objects::{SortField, SortOrder};
+use uuid::Uuid;
+
+pub struct ListSongsQuery {
+    pub sort: SortField,
+    pub order: SortOrder,
+}
+
+pub struct GetSongQuery {
+    pub id: Uuid,
+}
+
+pub struct SearchSongsQuery {
+    pub query: String,
+    pub sort: SortField,
+    pub order: SortOrder,
+}
--- a/crates/application/src/songs/save_song.rs
+++ b/crates/application/src/songs/save_song.rs
@@ -0,0 +1,15 @@
+use domain::errors::DomainError;
+use domain::models::StoredSong;
+
+use super::commands::SaveSongCommand;
+use super::deps::SongCommandDeps;
+
+pub async fn execute(
+    deps: &SongCommandDeps,
+    cmd: SaveSongCommand,
+) -> Result<StoredSong, DomainError> {
+    let title = cmd.song.meta.title.clone();
+    let result = deps.repo.save(&cmd.song).await?;
+    tracing::debug!(id = %result.id, title, "song saved");
+    Ok(result)
+}
--- a/crates/application/src/songs/search_songs.rs
+++ b/crates/application/src/songs/search_songs.rs
@@ -0,0 +1,14 @@
+use domain::errors::DomainError;
+use domain::models::SongSummary;
+
+use super::deps::SongQueryDeps;
+use super::queries::SearchSongsQuery;
+
+pub async fn execute(
+    deps: &SongQueryDeps,
+    query: SearchSongsQuery,
+) -> Result<Vec<SongSummary>, DomainError> {
+    deps.search
+        .search(&query.query, query.sort, query.order)
+        .await
+}
--- a/crates/application/src/songs/update_meta.rs
+++ b/crates/application/src/songs/update_meta.rs
@@ -0,0 +1,22 @@
+use domain::errors::DomainError;
+use domain::models::SongSummary;
+
+use super::commands::UpdateSongMetaCommand;
+use super::deps::SongCommandDeps;
+
+pub async fn execute(
+    deps: &SongCommandDeps,
+    cmd: UpdateSongMetaCommand,
+) -> Result<SongSummary, DomainError> {
+    let result = deps
+        .repo
+        .update_meta(
+            cmd.id,
+            cmd.title.as_deref(),
+            cmd.artist.as_deref(),
+            cmd.original_key.as_deref(),
+        )
+        .await?;
+    tracing::debug!(id = %cmd.id, "song meta updated");
+    Ok(result)
+}
--- a/crates/application/src/tabs/commands.rs
+++ b/crates/application/src/tabs/commands.rs
@@ -0,0 +1,4 @@
+pub struct ParseTabCommand {
+    pub source: Option<String>,
+    pub html: Option<String>,
+}
--- a/crates/application/src/tabs/deps.rs
+++ b/crates/application/src/tabs/deps.rs
@@ -0,0 +1,7 @@
+use domain::ports::{TabFetcherPort, TabParserPort};
+use std::sync::Arc;
+
+pub struct ParseTabDeps {
+    pub fetcher: Arc<dyn TabFetcherPort>,
+    pub parser: Arc<dyn TabParserPort>,
+}
--- a/crates/application/src/tabs/mod.rs
+++ b/crates/application/src/tabs/mod.rs
@@ -0,0 +1,3 @@
+pub mod commands;
+pub mod deps;
+pub mod parse_tab;
--- a/crates/application/src/tabs/parse_tab.rs
+++ b/crates/application/src/tabs/parse_tab.rs
@@ -0,0 +1,45 @@
+use std::path::PathBuf;
+
+use domain::errors::DomainError;
+use domain::models::Song;
+use domain::ports::TabSource;
+
+use super::commands::ParseTabCommand;
+use super::deps::ParseTabDeps;
+
+pub async fn execute(deps: &ParseTabDeps, cmd: ParseTabCommand) -> Result<Song, DomainError> {
+    let html = if let Some(raw_html) = cmd.html {
+        tracing::debug!("parsing from raw HTML input");
+        Ok(raw_html)
+    } else if let Some(source) = cmd.source {
+        let tab_source = if source.starts_with("file://") {
+            let path = source.trim_start_matches("file://");
+            TabSource::File(PathBuf::from(path))
+        } else {
+            tracing::debug!(url = source, "fetching tab from URL");
+            TabSource::Url(source)
+        };
+        deps.fetcher
+            .fetch(tab_source)
+            .await
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))
+    } else {
+        Err(DomainError::ValidationError(
+            "Provide either 'source' or 'html'".into(),
+        ))
+    }?;
+
+    let song = deps
+        .parser
+        .parse(&html)
+        .map_err(|e| DomainError::InfrastructureError(e.to_string()))?;
+
+    tracing::debug!(
+        title = song.meta.title,
+        artist = song.meta.artist,
+        sections = song.sections.len(),
+        "tab parsed"
+    );
+
+    Ok(song)
+}
--- a/crates/common/Cargo.toml
+++ b/crates/common/Cargo.toml
@@ -1,17 +0,0 @@
-[package]
-name = "common"
-version = "0.1.0"
-edition = "2024"
-
-[dependencies]
-anyhow = { workspace = true }
-reqwest = { workspace = true }
-serde = { workspace = true }
-serde_json = { workspace = true }
-thiserror = { workspace = true }
-tokio = { workspace = true }
-tracing = { workspace = true }
-uuid = { workspace = true }
-rand = { workspace = true }
-async-trait = { workspace = true }
-domain = { path = "../domain" }
--- a/crates/common/src/lib.rs
+++ b/crates/common/src/lib.rs
@@ -1,52 +0,0 @@
-use domain::{RepositoryError, Song, SongRepositoryPort, SongSearchPort, SongSummary, StoredSong, SortField, SortOrder};
-use uuid::Uuid;
-
-pub struct SongService {
-    repo: Box<dyn SongRepositoryPort>,
-}
-
-impl SongService {
-    pub fn new(repo: Box<dyn SongRepositoryPort>) -> Self {
-        Self { repo }
-    }
-
-    pub async fn save(&self, song: &Song) -> Result<StoredSong, RepositoryError> {
-        self.repo.save(song).await
-    }
-
-    pub async fn list(&self, sort: SortField, order: SortOrder) -> Result<Vec<SongSummary>, RepositoryError> {
-        self.repo.list(sort, order).await
-    }
-
-    pub async fn get(&self, id: Uuid) -> Result<Option<Song>, RepositoryError> {
-        self.repo.get(id).await
-    }
-
-    pub async fn delete(&self, id: Uuid) -> Result<(), RepositoryError> {
-        self.repo.delete(id).await
-    }
-
-    pub async fn update_meta(
-        &self,
-        id: Uuid,
-        title: Option<&str>,
-        artist: Option<&str>,
-        original_key: Option<&str>,
-    ) -> Result<domain::SongSummary, domain::RepositoryError> {
-        self.repo.update_meta(id, title, artist, original_key).await
-    }
-}
-
-pub struct SongSearchService {
-    search: Box<dyn SongSearchPort>,
-}
-
-impl SongSearchService {
-    pub fn new(search: Box<dyn SongSearchPort>) -> Self {
-        Self { search }
-    }
-
-    pub async fn search(&self, query: &str, sort: SortField, order: SortOrder) -> Result<Vec<domain::SongSummary>, domain::RepositoryError> {
-        self.search.search(query, sort, order).await
-    }
-}
--- a/crates/domain/Cargo.toml
+++ b/crates/domain/Cargo.toml
@@ -4,10 +4,9 @@ version = "0.1.0"
 edition = "2024"

 [dependencies]
-anyhow = { workspace = true }
 thiserror = { workspace = true }
-tracing = { workspace = true }
 uuid = { workspace = true }
-rand = { workspace = true }
 serde = { workspace = true }
 async-trait = { workspace = true }
+chrono = { version = "0.4", features = ["serde"] }
+email_address = "0.2"
--- a/crates/domain/src/chord.rs
+++ b/crates/domain/src/chord.rs
@@ -1,92 +0,0 @@
-use serde::{Deserialize, Serialize};
-use crate::Note;
-
-#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
-#[serde(into = "String", try_from = "String")]
-pub struct Chord {
-    pub root: Note,
-    pub descriptor: Option<String>,
-}
-
-impl Chord {
-    pub fn parse(s: &str) -> Option<Self> {
-        let (root, consumed) = Note::parse_prefix(s)?;
-        let descriptor = if consumed < s.len() {
-            Some(s[consumed..].to_string())
-        } else {
-            None
-        };
-        Some(Chord { root, descriptor })
-    }
-
-    /// Display chord name. use_sharps=true → "F#m", false → "Gbm".
-    pub fn name(&self, use_sharps: bool) -> String {
-        let root_str = if use_sharps {
-            self.root.to_sharp_str()
-        } else {
-            self.root.to_flat_str()
-        };
-        match &self.descriptor {
-            Some(d) => format!("{}{}", root_str, d),
-            None => root_str.to_string(),
-        }
-    }
-}
-
-impl From<Chord> for String {
-    fn from(c: Chord) -> String {
-        c.name(true)
-    }
-}
-
-impl TryFrom<String> for Chord {
-    type Error = String;
-    fn try_from(s: String) -> Result<Self, Self::Error> {
-        Chord::parse(&s).ok_or_else(|| format!("invalid chord: {}", s))
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn parse_simple() {
-        let c = Chord::parse("Em").unwrap();
-        assert_eq!(c.root, crate::Note::E);
-        assert_eq!(c.descriptor.as_deref(), Some("m"));
-    }
-
-    #[test]
-    fn parse_no_descriptor() {
-        let c = Chord::parse("G").unwrap();
-        assert_eq!(c.root, crate::Note::G);
-        assert!(c.descriptor.is_none());
-    }
-
-    #[test]
-    fn parse_flat_root() {
-        let c = Chord::parse("Bb").unwrap();
-        assert_eq!(c.root, crate::Note::ASharpBFlat);
-        assert!(c.descriptor.is_none());
-    }
-
-    #[test]
-    fn name_sharp() {
-        let c = Chord { root: crate::Note::FSharpGFlat, descriptor: Some("m".into()) };
-        assert_eq!(c.name(true), "F#m");
-    }
-
-    #[test]
-    fn name_flat() {
-        let c = Chord { root: crate::Note::ASharpBFlat, descriptor: None };
-        assert_eq!(c.name(false), "Bb");
-    }
-
-    #[test]
-    fn parse_flat_with_descriptor() {
-        let c = Chord::parse("Bbm").unwrap();
-        assert_eq!(c.root, crate::Note::ASharpBFlat);
-        assert_eq!(c.descriptor.as_deref(), Some("m"));
-    }
-}
--- a/crates/domain/src/errors/mod.rs
+++ b/crates/domain/src/errors/mod.rs
@@ -0,0 +1,19 @@
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum DomainError {
+    #[error("Entity not found")]
+    NotFound,
+
+    #[error("Business rule violation: {0}")]
+    ValidationError(String),
+
+    #[error("Infrastructure failure: {0}")]
+    InfrastructureError(String),
+
+    #[error("Unauthorized: {0}")]
+    Unauthorized(String),
+
+    #[error("Forbidden: {0}")]
+    Forbidden(String),
+}
--- a/crates/domain/src/lib.rs
+++ b/crates/domain/src/lib.rs
@@ -1,13 +1,19 @@
-pub mod note;
-pub mod chord;
-pub mod song;
+pub mod errors;
+pub mod models;
 pub mod ports;
-pub mod transposer;
+pub mod services;
+pub mod value_objects;

-pub use note::Note;
-pub use chord::Chord;
-pub use song::{ChordPosition, LyricLine, Section, SectionKind, SongMeta, Song};
-pub use song::{song_preview_chords, StoredSong, SongSummary};
-pub use ports::{FetchError, ParseError, TabFetcherPort, TabParserPort, TabSource};
-pub use ports::{RepositoryError, SongRepositoryPort, SongSearchPort, SortField, SortOrder};
-pub use transposer::{ChordTransposer, TransposeError};
+pub use errors::DomainError;
+pub use models::{
+    ChordPosition, GeneratedToken, LyricLine, RefreshSession, Section, SectionKind, Song, SongMeta,
+    SongSummary, StoredSong, User, song_preview_chords,
+};
+pub use ports::{
+    AuthService, FetchError, ParseError, PasswordHasher, RefreshSessionRepository,
+    SongRepositoryPort, SongSearchPort, TabFetcherPort, TabParserPort, TabSource, UserRepository,
+};
+pub use services::{ChordTransposer, TransposeError};
+pub use value_objects::{
+    Chord, Email, Note, Password, PasswordHash, SortField, SortOrder, UserId, Username,
+};
--- a/crates/domain/src/models/mod.rs
+++ b/crates/domain/src/models/mod.rs
@@ -0,0 +1,7 @@
+pub mod refresh_session;
+pub mod song;
+pub mod user;
+
+pub use refresh_session::*;
+pub use song::*;
+pub use user::*;
--- a/crates/domain/src/models/refresh_session.rs
+++ b/crates/domain/src/models/refresh_session.rs
@@ -0,0 +1,17 @@
+use chrono::{DateTime, Utc};
+use uuid::Uuid;
+
+use crate::value_objects::UserId;
+
+pub struct GeneratedToken {
+    pub token: String,
+    pub expires_at: DateTime<Utc>,
+}
+
+pub struct RefreshSession {
+    pub id: Uuid,
+    pub user_id: UserId,
+    pub token: String,
+    pub expires_at: DateTime<Utc>,
+    pub created_at: DateTime<Utc>,
+}
--- a/crates/domain/src/models/song.rs
+++ b/crates/domain/src/models/song.rs
@@ -1,5 +1,7 @@
 use serde::{Deserialize, Serialize};
-use crate::Chord;
+use uuid::Uuid;
+
+use crate::value_objects::Chord;

 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct ChordPosition {
@@ -16,8 +18,14 @@ pub struct LyricLine {
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "snake_case")]
 pub enum SectionKind {
-    Verse, Chorus, Bridge, PreChorus,
-    Intro, Outro, Break, Tab,
+    Verse,
+    Chorus,
+    Bridge,
+    PreChorus,
+    Intro,
+    Outro,
+    Break,
+    Tab,
    Other(String),
 }

@@ -60,8 +68,6 @@ pub struct Song {
    pub sections: Vec<Section>,
 }

-use uuid::Uuid;
-
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct StoredSong {
    pub id: Uuid,
@@ -95,28 +101,5 @@ pub fn song_preview_chords(song: &Song) -> Vec<String> {
 }

 #[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::{Chord, Note};
-
-    #[test]
-    fn lyric_line_chord_positions() {
-        let line = LyricLine {
-            text: "A drop in the ocean".into(),
-            chords: vec![
-                ChordPosition { offset: 0, chord: Chord { root: Note::E, descriptor: Some("m".into()) } },
-                ChordPosition { offset: 8, chord: Chord { root: Note::C, descriptor: None } },
-            ],
-        };
-        assert_eq!(line.chords[0].offset, 0);
-        assert_eq!(line.chords[1].offset, 8);
-    }
-
-    #[test]
-    fn section_kind_from_label() {
-        assert_eq!(SectionKind::from_label("Chorus"), SectionKind::Chorus);
-        assert_eq!(SectionKind::from_label("Pre-Chorus"), SectionKind::PreChorus);
-        assert_eq!(SectionKind::from_label("Tab"), SectionKind::Tab);
-        assert_eq!(SectionKind::from_label("Riff"), SectionKind::Other("Riff".into()));
-    }
-}
+#[path = "../tests/song.rs"]
+mod tests;
--- a/crates/domain/src/models/user.rs
+++ b/crates/domain/src/models/user.rs
@@ -0,0 +1,50 @@
+use crate::value_objects::{Email, PasswordHash, UserId, Username};
+
+#[derive(Debug, Clone)]
+pub struct User {
+    id: UserId,
+    email: Email,
+    username: Username,
+    password_hash: PasswordHash,
+}
+
+impl User {
+    pub fn new(email: Email, username: Username, password_hash: PasswordHash) -> Self {
+        Self {
+            id: UserId::generate(),
+            email,
+            username,
+            password_hash,
+        }
+    }
+
+    pub fn from_persistence(
+        id: UserId,
+        email: Email,
+        username: Username,
+        password_hash: PasswordHash,
+    ) -> Self {
+        Self {
+            id,
+            email,
+            username,
+            password_hash,
+        }
+    }
+
+    pub fn id(&self) -> &UserId {
+        &self.id
+    }
+
+    pub fn email(&self) -> &Email {
+        &self.email
+    }
+
+    pub fn username(&self) -> &Username {
+        &self.username
+    }
+
+    pub fn password_hash(&self) -> &PasswordHash {
+        &self.password_hash
+    }
+}
--- a/crates/domain/src/note.rs
+++ b/crates/domain/src/note.rs
@@ -1,111 +0,0 @@
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum Note {
-    A, ASharpBFlat, B, C, CSharpDFlat, D,
-    DSharpEFlat, E, F, FSharpGFlat, G, GSharpAFlat,
-}
-
-impl Note {
-    pub fn semitone(&self) -> u8 {
-        match self {
-            Note::C => 0, Note::CSharpDFlat => 1, Note::D => 2,
-            Note::DSharpEFlat => 3, Note::E => 4, Note::F => 5,
-            Note::FSharpGFlat => 6, Note::G => 7, Note::GSharpAFlat => 8,
-            Note::A => 9, Note::ASharpBFlat => 10, Note::B => 11,
-        }
-    }
-
-    pub fn from_semitone(s: u8) -> Note {
-        match s % 12 {
-            0 => Note::C, 1 => Note::CSharpDFlat, 2 => Note::D,
-            3 => Note::DSharpEFlat, 4 => Note::E, 5 => Note::F,
-            6 => Note::FSharpGFlat, 7 => Note::G, 8 => Note::GSharpAFlat,
-            9 => Note::A, 10 => Note::ASharpBFlat, 11 => Note::B,
-            _ => unreachable!(),
-        }
-    }
-
-    pub fn to_sharp_str(&self) -> &'static str {
-        match self {
-            Note::C => "C", Note::CSharpDFlat => "C#", Note::D => "D",
-            Note::DSharpEFlat => "D#", Note::E => "E", Note::F => "F",
-            Note::FSharpGFlat => "F#", Note::G => "G", Note::GSharpAFlat => "G#",
-            Note::A => "A", Note::ASharpBFlat => "A#", Note::B => "B",
-        }
-    }
-
-    pub fn to_flat_str(&self) -> &'static str {
-        match self {
-            Note::C => "C", Note::CSharpDFlat => "Db", Note::D => "D",
-            Note::DSharpEFlat => "Eb", Note::E => "E", Note::F => "F",
-            Note::FSharpGFlat => "Gb", Note::G => "G", Note::GSharpAFlat => "Ab",
-            Note::A => "A", Note::ASharpBFlat => "Bb", Note::B => "B",
-        }
-    }
-
-    /// Parse just the note portion from the start of a string.
-    /// Returns (Note, chars_consumed) or None.
-    pub fn parse_prefix(s: &str) -> Option<(Note, usize)> {
-        let mut chars = s.chars();
-        let root = match chars.next()? {
-            'A' => Note::A, 'B' => Note::B, 'C' => Note::C, 'D' => Note::D,
-            'E' => Note::E, 'F' => Note::F, 'G' => Note::G, _ => return None,
-        };
-        match chars.next() {
-            Some('#') => Some((Self::sharp_of(root), 2)),
-            Some('b') if s.len() > 1 => {
-                let flatted = Self::flat_of(root)?;
-                Some((flatted, 2))
-            }
-            _ => Some((root, 1)),
-        }
-    }
-
-    pub fn parse(s: &str) -> Option<Note> {
-        let (note, consumed) = Self::parse_prefix(s)?;
-        if consumed == s.len() { Some(note) } else { None }
-    }
-
-    fn sharp_of(root: Note) -> Note {
-        Note::from_semitone((root.semitone() + 1) % 12)
-    }
-
-    fn flat_of(root: Note) -> Option<Note> {
-        Some(Note::from_semitone((root.semitone() + 11) % 12))
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn semitone_roundtrip() {
-        assert_eq!(Note::from_semitone(Note::A.semitone()), Note::A);
-        assert_eq!(Note::from_semitone(Note::FSharpGFlat.semitone()), Note::FSharpGFlat);
-    }
-
-    #[test]
-    fn parse_cb_enharmonic() {
-        assert_eq!(Note::parse("Cb"), Some(Note::B));
-    }
-
-    #[test]
-    fn sharp_display() {
-        assert_eq!(Note::ASharpBFlat.to_sharp_str(), "A#");
-        assert_eq!(Note::FSharpGFlat.to_sharp_str(), "F#");
-    }
-
-    #[test]
-    fn flat_display() {
-        assert_eq!(Note::ASharpBFlat.to_flat_str(), "Bb");
-        assert_eq!(Note::CSharpDFlat.to_flat_str(), "Db");
-    }
-
-    #[test]
-    fn parse_note() {
-        assert_eq!(Note::parse("F#"), Some(Note::FSharpGFlat));
-        assert_eq!(Note::parse("Gb"), Some(Note::FSharpGFlat));
-        assert_eq!(Note::parse("A"), Some(Note::A));
-        assert_eq!(Note::parse("X"), None);
-    }
-}
--- a/crates/domain/src/ports.rs
+++ b/crates/domain/src/ports.rs
@@ -1,83 +0,0 @@
-use std::path::PathBuf;
-use thiserror::Error;
-use async_trait::async_trait;
-use crate::song::Song;
-
-#[derive(Debug, Clone)]
-pub enum TabSource {
-    File(PathBuf),
-    Url(String),
-}
-
-#[derive(Debug, Error)]
-pub enum FetchError {
-    #[error("IO error: {0}")]
-    Io(#[from] std::io::Error),
-    #[error("Network error: {0}")]
-    Network(String),
-    #[error("Response is not HTML")]
-    InvalidContentType,
-}
-
-#[derive(Debug, Error)]
-pub enum ParseError {
-    #[error("Tab content not found in HTML")]
-    MissingContent,
-    #[error("Malformed HTML: {0}")]
-    MalformedHtml(String),
-}
-
-#[async_trait]
-pub trait TabFetcherPort: Send + Sync {
-    async fn fetch(&self, source: TabSource) -> Result<String, FetchError>;
-}
-
-pub trait TabParserPort: Send + Sync {
-    fn parse(&self, html: &str) -> Result<Song, ParseError>;
-}
-
-use uuid::Uuid;
-use crate::song::{StoredSong, SongSummary};
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
-pub enum SortField {
-    #[default]
-    Date,
-    Title,
-    Artist,
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
-pub enum SortOrder {
-    #[default]
-    Desc,
-    Asc,
-}
-
-#[derive(Debug, Error)]
-pub enum RepositoryError {
-    #[error("Song not found")]
-    NotFound,
-    #[error("Database error: {0}")]
-    Internal(String),
-}
-
-#[async_trait]
-pub trait SongRepositoryPort: Send + Sync {
-    async fn save(&self, song: &Song) -> Result<StoredSong, RepositoryError>;
-    async fn list(&self, sort: SortField, order: SortOrder) -> Result<Vec<SongSummary>, RepositoryError>;
-    async fn get(&self, id: Uuid) -> Result<Option<Song>, RepositoryError>;
-    async fn delete(&self, id: Uuid) -> Result<(), RepositoryError>;
-    async fn update_meta(
-        &self,
-        id: Uuid,
-        title: Option<&str>,
-        artist: Option<&str>,
-        original_key: Option<&str>,
-    ) -> Result<SongSummary, RepositoryError>;
-}
-
-#[async_trait]
-pub trait SongSearchPort: Send + Sync {
-    async fn search(&self, query: &str, sort: SortField, order: SortOrder) -> Result<Vec<SongSummary>, RepositoryError>;
-}
--- a/crates/domain/src/ports/auth.rs
+++ b/crates/domain/src/ports/auth.rs
@@ -0,0 +1,34 @@
+use async_trait::async_trait;
+
+use crate::errors::DomainError;
+use crate::models::{GeneratedToken, RefreshSession, User};
+use crate::value_objects::{Email, PasswordHash, UserId, Username};
+
+#[async_trait]
+pub trait AuthService: Send + Sync {
+    async fn generate_token(&self, user_id: &UserId) -> Result<GeneratedToken, DomainError>;
+    async fn validate_token(&self, token: &str) -> Result<UserId, DomainError>;
+}
+
+#[async_trait]
+pub trait PasswordHasher: Send + Sync {
+    async fn hash(&self, plain_password: &str) -> Result<PasswordHash, DomainError>;
+    async fn verify(&self, plain_password: &str, hash: &PasswordHash) -> Result<bool, DomainError>;
+}
+
+#[async_trait]
+pub trait UserRepository: Send + Sync {
+    async fn find_by_email(&self, email: &Email) -> Result<Option<User>, DomainError>;
+    async fn find_by_username(&self, username: &Username) -> Result<Option<User>, DomainError>;
+    async fn find_by_id(&self, id: &UserId) -> Result<Option<User>, DomainError>;
+    async fn save(&self, user: &User) -> Result<(), DomainError>;
+}
+
+#[async_trait]
+pub trait RefreshSessionRepository: Send + Sync {
+    async fn create(&self, session: &RefreshSession) -> Result<(), DomainError>;
+    async fn get_by_token(&self, token: &str) -> Result<Option<RefreshSession>, DomainError>;
+    async fn revoke(&self, token: &str) -> Result<(), DomainError>;
+    async fn revoke_all_for_user(&self, user_id: &UserId) -> Result<(), DomainError>;
+    async fn delete_expired(&self) -> Result<u64, DomainError>;
+}
--- a/crates/domain/src/ports/mod.rs
+++ b/crates/domain/src/ports/mod.rs
@@ -0,0 +1,7 @@
+pub mod auth;
+pub mod repository;
+pub mod tab_source;
+
+pub use auth::*;
+pub use repository::*;
+pub use tab_source::*;
--- a/crates/domain/src/ports/repository.rs
+++ b/crates/domain/src/ports/repository.rs
@@ -0,0 +1,35 @@
+use async_trait::async_trait;
+use uuid::Uuid;
+
+use crate::errors::DomainError;
+use crate::models::{Song, SongSummary, StoredSong};
+use crate::value_objects::{SortField, SortOrder};
+
+#[async_trait]
+pub trait SongRepositoryPort: Send + Sync {
+    async fn save(&self, song: &Song) -> Result<StoredSong, DomainError>;
+    async fn list(
+        &self,
+        sort: SortField,
+        order: SortOrder,
+    ) -> Result<Vec<SongSummary>, DomainError>;
+    async fn get(&self, id: Uuid) -> Result<Option<Song>, DomainError>;
+    async fn delete(&self, id: Uuid) -> Result<(), DomainError>;
+    async fn update_meta(
+        &self,
+        id: Uuid,
+        title: Option<&str>,
+        artist: Option<&str>,
+        original_key: Option<&str>,
+    ) -> Result<SongSummary, DomainError>;
+}
+
+#[async_trait]
+pub trait SongSearchPort: Send + Sync {
+    async fn search(
+        &self,
+        query: &str,
+        sort: SortField,
+        order: SortOrder,
+    ) -> Result<Vec<SongSummary>, DomainError>;
+}
--- a/crates/domain/src/ports/tab_source.rs
+++ b/crates/domain/src/ports/tab_source.rs
@@ -0,0 +1,37 @@
+use crate::models::Song;
+use async_trait::async_trait;
+use std::path::PathBuf;
+use thiserror::Error;
+
+#[derive(Debug, Clone)]
+pub enum TabSource {
+    File(PathBuf),
+    Url(String),
+}
+
+#[derive(Debug, Error)]
+pub enum FetchError {
+    #[error("IO error: {0}")]
+    Io(#[from] std::io::Error),
+    #[error("Network error: {0}")]
+    Network(String),
+    #[error("Response is not HTML")]
+    InvalidContentType,
+}
+
+#[derive(Debug, Error)]
+pub enum ParseError {
+    #[error("Tab content not found in HTML")]
+    MissingContent,
+    #[error("Malformed HTML: {0}")]
+    MalformedHtml(String),
+}
+
+#[async_trait]
+pub trait TabFetcherPort: Send + Sync {
+    async fn fetch(&self, source: TabSource) -> Result<String, FetchError>;
+}
+
+pub trait TabParserPort: Send + Sync {
+    fn parse(&self, html: &str) -> Result<Song, ParseError>;
+}
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Gabriel Kaszewski	792c9bf9ec	style: rustfmt All checks were successful CI / Check / Test (push) Successful in 11m29s Details	2026-07-11 22:58:00 +02:00
Gabriel Kaszewski	f513061405	fix(app): auto-scroll on iOS using scrollBy with integer accumulator	2026-07-11 22:54:17 +02:00
Gabriel Kaszewski	9f844bac2e	fix(app): chord overflow clip, section nav scroll on mobile	2026-07-11 22:49:05 +02:00
Gabriel Kaszewski	6912653906	fix(app): cache useFavorites snapshot to prevent infinite re-render	2026-07-11 22:39:46 +02:00
Gabriel Kaszewski	bb4d07055f	refactor(app): react-query for data fetching, fix infinite re-render	2026-07-11 22:37:11 +02:00
Gabriel Kaszewski	af328deac1	refactor: backend-only transpose, remove client-side transpose logic	2026-07-11 22:30:59 +02:00
Gabriel Kaszewski	381f273f10	feat(app): section nav, auto-scroll, favorites, fullscreen, wake lock, transposed key	2026-07-11 22:24:35 +02:00
Gabriel Kaszewski	2a628db521	feat: slash chord support (G/B parses+transposes bass note) All checks were successful CI / Check / Test (push) Successful in 11m54s Details	2026-07-11 22:12:03 +02:00
Gabriel Kaszewski	2f635c9b24	chore: enable LTO for release builds	2026-07-11 22:05:11 +02:00
Gabriel Kaszewski	fb936a64b0	clean up All checks were successful CI / Check / Test (push) Successful in 12m2s Details	2026-07-11 22:00:59 +02:00
Gabriel Kaszewski	2bfd0c7984	chore: gitignore sqlite files, update lockfile	2026-07-11 22:00:31 +02:00
Gabriel Kaszewski	bfaea4a4b0	style: rustfmt	2026-07-11 21:59:47 +02:00
Gabriel Kaszewski	2b702d88e4	feat: add tracing throughout, HTTP TraceLayer, detailed error logs	2026-07-11 21:58:58 +02:00
Gabriel Kaszewski	e89cf48b34	fix: sqlite create_if_missing on connect	2026-07-11 21:51:34 +02:00
Gabriel Kaszewski	aa31e1bdcd	docs: update LICENSE, README, architecture diagram	2026-07-11 21:49:49 +02:00
Gabriel Kaszewski	ff39680106	ci: add Gitea + GitHub Actions workflows	2026-07-11 21:44:39 +02:00
Gabriel Kaszewski	35b82fc5b3	chore: add dev/deploy targets to Makefile, deploy.sh	2026-07-11 21:43:55 +02:00
Gabriel Kaszewski	c4e9076b11	feat(app): auth UI, SPA mode, /api base URL - auth: login/register bottom sheets, token storage, authFetch - AuthProvider context w/ auto-refresh on mount - hide add/edit/delete for guests, sign-in button in nav - SPA mode (ssr:false), loaders→client-side useEffect - API base URL /api (same-origin), loading spinners	2026-07-11 21:40:57 +02:00
Gabriel Kaszewski	7bd27d9b9c	feat: JWT auth, /api prefix, SPA serving, OpenAPI, lean main.rs - auth: register/login/refresh/logout w/ JWT+Argon2, protected mutations - domain: User, RefreshSession, auth ports, Unauthorized/Forbidden errors - presentation: context/state/factory/errors/extractors/openapi modules - routes behind /api, SPA served from root w/ fallback - OpenAPI Scalar at /docs - frontend ssr:false, single-binary Dockerfile	2026-07-11 21:28:52 +02:00
Gabriel Kaszewski	13031347cc	samples	2026-07-11 21:02:28 +02:00
Gabriel Kaszewski	d13df586dd	refactor: DDD/CQRS architecture, unified crate layout - crates: common→application, api→presentation, infrastructure/→adapters/ - new crates: api-types, infra-wiring - domain: errors/, models/, value_objects/, ports/, services/ - application: CQRS use cases (songs/, tabs/) w/ commands, queries, deps - unified DomainError replaces RepositoryError - workspace deps, unused dep cleanup - fix: parse plain-text chord lines (UG drops spans mid-song) - tests extracted to separate modules (tests/ dirs)	2026-07-11 21:02:10 +02:00