arch: push wire types out of ClientApp, extract event_service, cleanup dead code

- ClientApp stores domain types, RepaintCommand carries DisplayHint + Vec<(String,Value)>
- adapters no longer convert Wire→Domain (eliminated duplication in esp32 + desktop)
- event_service in application layer handles LayoutChanged/WebhookDataReceived/ThemeChanged
- bootstrap event_handler reduced to 10-line dispatcher
- polling_service reuses event_service::apply_and_broadcast (deduplicated broadcast pattern)
- AppState.config_service() replaces 11 inline ConfigService::new() calls
- delete unused poll_interval_secs parameter chain
- delete unused StoragePort/ClientConfig (zero implementations)

.env.example

@@ -2,7 +2,6 @@
 KFRAME_DATABASE_URL=sqlite:kframe.db?mode=rwc
 KFRAME_TCP_ADDR=0.0.0.0:2699
 KFRAME_HTTP_ADDR=0.0.0.0:3000
-KFRAME_POLL_INTERVAL_SECS=5
 
 # Auth (required)
 JWT_SECRET=change-me-to-a-random-secret

Cargo.lock

@@ -79,9 +79,11 @@ dependencies = [
 name = "application"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "domain",
  "thiserror",
  "tokio",
+ "tracing",
 ]
 
 [[package]]
@@ -526,6 +528,9 @@ dependencies = [
 [[package]]
 name = "domain"
 version = "0.1.0"
+dependencies = [
+ "serde_json",
+]
 
 [[package]]
 name = "dotenvy"
@@ -1687,7 +1692,6 @@ dependencies = [
 name = "protocol"
 version = "0.1.0"
 dependencies = [
- "domain",
  "postcard",
  "serde",
 ]

README.md

@@ -89,6 +89,23 @@ cd spa && bun install && bun run dev
 # 5. Add a data source, create widgets, build a layout
 ```
 
+### ESP32 wiring
+
+2.4" ILI9341 SPI LCD module → ESP-WROOM-32:
+
+| LCD Pin | ESP32 GPIO | Function |
+|---------|------------|----------|
+| VCC     | 3V3        | Power    |
+| GND     | GND        | Ground   |
+| DIN     | GPIO23     | SPI MOSI |
+| CLK     | GPIO18     | SPI SCLK |
+| CS      | GPIO26     | Chip select |
+| DC      | GPIO21     | Data/command |
+| RST     | GPIO22     | Reset    |
+| BL      | 3V3        | Backlight (always on) |
+
+Uses SPI2 (HSPI) at 26 MHz. Pin assignments are in `crates/client-esp32/src/main.rs`.
+
 ### ESP32 client
 
 ```bash

crates/adapters/config-memory/src/lib.rs

@@ -1,6 +1,6 @@
 use domain::{
     ConfigRepository, DataSource, DataSourceId, Layout, LayoutPreset, LayoutPresetId, ThemeConfig,
-    User, WidgetConfig, WidgetId,
+    User, UserRepository, WidgetConfig, WidgetId, WidgetState, WidgetStateCache,
 };
 use std::collections::HashMap;
 use std::sync::RwLock;
@@ -177,6 +177,10 @@ impl ConfigRepository for MemoryConfigStore {
         guard.remove(&id);
         Ok(())
     }
+}
+
+impl UserRepository for MemoryConfigStore {
+    type Error = MemoryConfigError;
 
     async fn get_user_by_username(&self, username: &str) -> Result<Option<User>, Self::Error> {
         let guard = self
@@ -204,3 +208,18 @@ impl ConfigRepository for MemoryConfigStore {
         Ok(guard.len() as u32)
     }
 }
+
+impl WidgetStateCache for MemoryConfigStore {
+    type Error = MemoryConfigError;
+
+    async fn save_widget_states(
+        &self,
+        _states: &[(WidgetId, WidgetState)],
+    ) -> Result<(), Self::Error> {
+        Ok(())
+    }
+
+    async fn load_widget_states(&self) -> Result<Vec<(WidgetId, WidgetState)>, Self::Error> {
+        Ok(vec![])
+    }
+}

crates/adapters/config-sqlite/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-domain.workspace = true
+domain = { workspace = true, features = ["json"] }
 sqlx.workspace = true
 serde.workspace = true
 serde_json.workspace = true

crates/adapters/config-sqlite/src/lib.rs

@@ -96,6 +96,15 @@ impl SqliteConfigStore {
         .execute(&self.pool)
         .await?;
 
+        sqlx::query(
+            "CREATE TABLE IF NOT EXISTS widget_state_cache (
+                widget_id INTEGER PRIMARY KEY,
+                state_json TEXT NOT NULL
+            )",
+        )
+        .execute(&self.pool)
+        .await?;
+
         // Add alignment columns to widgets (idempotent)
         let _ = sqlx::query("ALTER TABLE widgets ADD COLUMN h_align TEXT NOT NULL DEFAULT 'left'")
             .execute(&self.pool)

crates/adapters/config-sqlite/src/repository/mod.rs

@@ -3,13 +3,14 @@ mod layout;
 mod presets;
 mod theme;
 mod users;
+mod widget_state_cache;
 mod widgets;
 
 use crate::SqliteConfigStore;
 use crate::error::SqliteConfigError;
 use domain::{
     ConfigRepository, DataSource, DataSourceId, Layout, LayoutPreset, LayoutPresetId, ThemeConfig,
-    User, WidgetConfig, WidgetId,
+    User, UserRepository, WidgetConfig, WidgetId, WidgetState, WidgetStateCache,
 };
 
 impl ConfigRepository for SqliteConfigStore {
@@ -78,6 +79,10 @@ impl ConfigRepository for SqliteConfigStore {
     async fn save_theme(&self, theme: &ThemeConfig) -> Result<(), Self::Error> {
         self.save_theme_impl(theme).await
     }
+}
+
+impl UserRepository for SqliteConfigStore {
+    type Error = SqliteConfigError;
 
     async fn get_user_by_username(&self, username: &str) -> Result<Option<User>, Self::Error> {
         self.get_user_by_username_impl(username).await
@@ -91,3 +96,18 @@ impl ConfigRepository for SqliteConfigStore {
         self.count_users_impl().await
     }
 }
+
+impl WidgetStateCache for SqliteConfigStore {
+    type Error = SqliteConfigError;
+
+    async fn save_widget_states(
+        &self,
+        states: &[(WidgetId, WidgetState)],
+    ) -> Result<(), Self::Error> {
+        self.save_widget_states_impl(states).await
+    }
+
+    async fn load_widget_states(&self) -> Result<Vec<(WidgetId, WidgetState)>, Self::Error> {
+        self.load_widget_states_impl().await
+    }
+}

crates/adapters/config-sqlite/src/repository/widget_state_cache.rs

@@ -0,0 +1,60 @@
+use crate::SqliteConfigStore;
+use crate::error::SqliteConfigError;
+use domain::{Value, WidgetId, WidgetState};
+use sqlx::Row;
+use std::collections::BTreeMap;
+
+impl SqliteConfigStore {
+    pub(crate) async fn save_widget_states_impl(
+        &self,
+        states: &[(WidgetId, WidgetState)],
+    ) -> Result<(), SqliteConfigError> {
+        for (id, state) in states {
+            let json = domain_state_to_json(state)
+                .map_err(|e| SqliteConfigError::Serialization(e.to_string()))?;
+            sqlx::query(
+                "INSERT OR REPLACE INTO widget_state_cache (widget_id, state_json) VALUES (?, ?)",
+            )
+            .bind(*id as i64)
+            .bind(&json)
+            .execute(&self.pool)
+            .await
+            .map_err(SqliteConfigError::Sql)?;
+        }
+        Ok(())
+    }
+
+    pub(crate) async fn load_widget_states_impl(
+        &self,
+    ) -> Result<Vec<(WidgetId, WidgetState)>, SqliteConfigError> {
+        let rows = sqlx::query("SELECT widget_id, state_json FROM widget_state_cache")
+            .fetch_all(&self.pool)
+            .await
+            .map_err(SqliteConfigError::Sql)?;
+
+        let mut result = Vec::new();
+        for row in &rows {
+            let id: i64 = row.get("widget_id");
+            let json_str: String = row.get("state_json");
+            let state = json_to_domain_state(&json_str)
+                .map_err(|e| SqliteConfigError::Serialization(e.to_string()))?;
+            result.push((id as WidgetId, state));
+        }
+        Ok(result)
+    }
+}
+
+fn domain_state_to_json(state: &WidgetState) -> Result<String, serde_json::Error> {
+    let data: serde_json::Map<String, serde_json::Value> = state
+        .data
+        .iter()
+        .map(|(k, v)| (k.clone(), v.into()))
+        .collect();
+    serde_json::to_string(&data)
+}
+
+fn json_to_domain_state(json: &str) -> Result<WidgetState, serde_json::Error> {
+    let map: serde_json::Map<String, serde_json::Value> = serde_json::from_str(json)?;
+    let data: BTreeMap<String, Value> = map.into_iter().map(|(k, v)| (k, v.into())).collect();
+    Ok(WidgetState { data, error: None })
+}

crates/adapters/config-sqlite/tests/config_store_tests.rs

@@ -2,7 +2,7 @@ use config_sqlite::SqliteConfigStore;
 use domain::{
     AlignItems, ConfigRepository, ContainerNode, DataSource, DataSourceConfig, DataSourceType,
     Direction, DisplayHint, DisplayHintKind, JustifyContent, KeyMapping, Layout, LayoutChild,
-    LayoutNode, LayoutPreset, Sizing, WidgetConfig,
+    LayoutNode, LayoutPreset, Sizing, UserRepository, WidgetConfig, WidgetStateCache,
 };
 use std::time::Duration;
 

crates/adapters/http-api/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-domain.workspace = true
+domain = { workspace = true, features = ["json"] }
 application.workspace = true
 api-types.workspace = true
 axum.workspace = true

crates/adapters/http-api/src/lib.rs

@@ -1,10 +1,11 @@
 pub mod extractors;
 mod routes;
 
+use application::ConfigService;
 use axum::Router;
 use domain::{
     AuthPort, BroadcastPort, ClientRegistry, ConfigRepository, EventPublisher, PasswordHashPort,
-    WidgetStateReader,
+    UserRepository, WidgetStateCache, WidgetStateReader,
 };
 use std::sync::Arc;
 use tower_http::cors::CorsLayer;
@@ -36,10 +37,23 @@ impl<C, E, W, B, R, A, H> Clone for AppState<C, E, W, B, R, A, H> {
     }
 }
 
+impl<C, E, W, B, R, A, H> AppState<C, E, W, B, R, A, H>
+where
+    C: ConfigRepository,
+    C::Error: std::fmt::Debug,
+    E: EventPublisher,
+    E::Error: std::fmt::Debug,
+{
+    pub fn config_service(&self) -> ConfigService<'_, C, E> {
+        ConfigService::new(self.config.as_ref(), self.events.as_ref())
+    }
+}
+
 pub fn router<C, E, W, B, R, A, H>(state: AppState<C, E, W, B, R, A, H>) -> Router
 where
-    C: ConfigRepository + Send + Sync + 'static,
-    C::Error: std::fmt::Debug + Send,
+    C: ConfigRepository + UserRepository + WidgetStateCache + Send + Sync + 'static,
+    <C as ConfigRepository>::Error: std::fmt::Debug + Send,
+    <C as UserRepository>::Error: std::fmt::Debug + Send,
     E: EventPublisher + Send + Sync + 'static,
     E::Error: std::fmt::Debug + Send,
     W: WidgetStateReader + Send + Sync + 'static,
@@ -69,8 +83,9 @@ pub async fn serve<C, E, W, B, R, A, H>(
     state: AppState<C, E, W, B, R, A, H>,
 ) -> Result<(), std::io::Error>
 where
-    C: ConfigRepository + Send + Sync + 'static,
-    C::Error: std::fmt::Debug + Send,
+    C: ConfigRepository + UserRepository + WidgetStateCache + Send + Sync + 'static,
+    <C as ConfigRepository>::Error: std::fmt::Debug + Send,
+    <C as UserRepository>::Error: std::fmt::Debug + Send,
     E: EventPublisher + Send + Sync + 'static,
     E::Error: std::fmt::Debug + Send,
     W: WidgetStateReader + Send + Sync + 'static,

crates/adapters/http-api/src/routes/auth.rs

@@ -2,7 +2,7 @@ use crate::AppState;
 use axum::extract::State;
 use axum::http::StatusCode;
 use axum::response::Json;
-use domain::{AuthPort, ConfigRepository, PasswordHashPort};
+use domain::{AuthPort, PasswordHashPort, UserRepository};
 use serde::{Deserialize, Serialize};
 
 type S<C, E, W, B, R, A, H> = State<AppState<C, E, W, B, R, A, H>>;
@@ -28,7 +28,7 @@ pub async fn login<C, E, W, B, R, A, H>(
     Json(body): Json<LoginRequest>,
 ) -> Result<Json<LoginResponse>, (StatusCode, String)>
 where
-    C: ConfigRepository,
+    C: UserRepository,
     C::Error: std::fmt::Debug,
     A: AuthPort,
     H: PasswordHashPort,
@@ -51,7 +51,7 @@ pub async fn register<C, E, W, B, R, A, H>(
     Json(body): Json<LoginRequest>,
 ) -> Result<StatusCode, (StatusCode, String)>
 where
-    C: ConfigRepository,
+    C: UserRepository,
     C::Error: std::fmt::Debug,
     H: PasswordHashPort,
 {
@@ -71,7 +71,7 @@ pub async fn auth_status<C, E, W, B, R, A, H>(
     State(state): S<C, E, W, B, R, A, H>,
 ) -> Result<Json<StatusResponse>, StatusCode>
 where
-    C: ConfigRepository,
+    C: UserRepository,
     C::Error: std::fmt::Debug,
 {
     let count = state

crates/adapters/http-api/src/routes/data_sources.rs

@@ -1,7 +1,7 @@
 use crate::AppState;
 use crate::extractors::AuthUser;
 use api_types::DataSourceDto;
-use application::ConfigService;
+
 use axum::{
     extract::{Path, State},
     http::StatusCode,
@@ -65,7 +65,7 @@ where
     let source = body
         .into_domain()
         .map_err(|e| (StatusCode::BAD_REQUEST, e))?;
-    let svc = ConfigService::new(state.config.as_ref(), state.events.as_ref());
+    let svc = state.config_service();
     svc.create_data_source(source)
         .await
         .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("{e}")))?;
@@ -87,7 +87,7 @@ where
     let source = body
         .into_domain()
         .map_err(|e| (StatusCode::BAD_REQUEST, e))?;
-    let svc = ConfigService::new(state.config.as_ref(), state.events.as_ref());
+    let svc = state.config_service();
     svc.update_data_source(source)
         .await
         .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("{e}")))?;
@@ -105,7 +105,7 @@ where
     E: EventPublisher,
     E::Error: std::fmt::Debug,
 {
-    let svc = ConfigService::new(state.config.as_ref(), state.events.as_ref());
+    let svc = state.config_service();
     svc.delete_data_source(id)
         .await
         .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;

crates/adapters/http-api/src/routes/layout.rs

@@ -1,7 +1,7 @@
 use crate::AppState;
 use crate::extractors::AuthUser;
 use api_types::LayoutDto;
-use application::ConfigService;
+
 use axum::{extract::State, http::StatusCode, response::Json};
 use domain::{ConfigRepository, EventPublisher};
 
@@ -39,7 +39,7 @@ where
     let layout = body
         .into_domain()
         .map_err(|e| (StatusCode::BAD_REQUEST, e))?;
-    let svc = ConfigService::new(state.config.as_ref(), state.events.as_ref());
+    let svc = state.config_service();
     svc.update_layout(layout)
         .await
         .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("{e}")))?;

crates/adapters/http-api/src/routes/mod.rs

@@ -12,13 +12,14 @@ use axum::Router;
 use axum::routing::{get, post};
 use domain::{
     AuthPort, BroadcastPort, ClientRegistry, ConfigRepository, EventPublisher, PasswordHashPort,
-    WidgetStateReader,
+    UserRepository, WidgetStateCache, WidgetStateReader,
 };
 
 pub fn api_routes<C, E, W, B, R, A, H>() -> Router<AppState<C, E, W, B, R, A, H>>
 where
-    C: ConfigRepository + Send + Sync + 'static,
-    C::Error: std::fmt::Debug + Send,
+    C: ConfigRepository + UserRepository + WidgetStateCache + Send + Sync + 'static,
+    <C as ConfigRepository>::Error: std::fmt::Debug + Send,
+    <C as UserRepository>::Error: std::fmt::Debug + Send,
     E: EventPublisher + Send + Sync + 'static,
     E::Error: std::fmt::Debug + Send,
     W: WidgetStateReader + Send + Sync + 'static,

crates/adapters/http-api/src/routes/presets.rs

@@ -1,7 +1,7 @@
 use crate::AppState;
 use crate::extractors::AuthUser;
 use api_types::{CreatePresetDto, PresetDto};
-use application::ConfigService;
+
 use axum::{
     extract::{Path, State},
     http::StatusCode,
@@ -65,7 +65,7 @@ where
     let preset = body
         .into_domain()
         .map_err(|e| (StatusCode::BAD_REQUEST, e))?;
-    let svc = ConfigService::new(state.config.as_ref(), state.events.as_ref());
+    let svc = state.config_service();
     svc.save_preset(preset)
         .await
         .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("{e}")))?;
@@ -83,7 +83,7 @@ where
     E: EventPublisher,
     E::Error: std::fmt::Debug,
 {
-    let svc = ConfigService::new(state.config.as_ref(), state.events.as_ref());
+    let svc = state.config_service();
     svc.delete_preset(id)
         .await
         .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;
@@ -101,7 +101,7 @@ where
     E: EventPublisher,
     E::Error: std::fmt::Debug,
 {
-    let svc = ConfigService::new(state.config.as_ref(), state.events.as_ref());
+    let svc = state.config_service();
     svc.load_preset(id)
         .await
         .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("{e}")))?;

crates/adapters/http-api/src/routes/theme.rs

@@ -1,7 +1,7 @@
 use crate::AppState;
 use crate::extractors::AuthUser;
 use api_types::ThemeDto;
-use application::ConfigService;
+
 use axum::{extract::State, http::StatusCode, response::Json};
 use domain::{ConfigRepository, EventPublisher};
 
@@ -38,7 +38,7 @@ where
     E::Error: std::fmt::Debug,
 {
     let theme = body.into_domain();
-    let svc = ConfigService::new(state.config.as_ref(), state.events.as_ref());
+    let svc = state.config_service();
     svc.update_theme(theme)
         .await
         .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("{e}")))?;

crates/adapters/http-api/src/routes/webhook.rs

@@ -31,7 +31,7 @@ where
         ));
     }
 
-    let data = json_to_domain_value(body);
+    let data: domain::Value = body.into();
 
     state
         .events
@@ -41,22 +41,3 @@ where
 
     Ok(StatusCode::OK)
 }
-
-fn json_to_domain_value(json: serde_json::Value) -> domain::Value {
-    match json {
-        serde_json::Value::Null => domain::Value::Null,
-        serde_json::Value::Bool(b) => domain::Value::Bool(b),
-        serde_json::Value::Number(n) => domain::Value::Number(n.as_f64().unwrap_or(0.0)),
-        serde_json::Value::String(s) => domain::Value::String(s),
-        serde_json::Value::Array(arr) => {
-            domain::Value::Array(arr.into_iter().map(json_to_domain_value).collect())
-        }
-        serde_json::Value::Object(obj) => {
-            let map = obj
-                .into_iter()
-                .map(|(k, v)| (k, json_to_domain_value(v)))
-                .collect();
-            domain::Value::Object(map)
-        }
-    }
-}

crates/adapters/http-api/src/routes/widgets.rs

@@ -1,7 +1,7 @@
 use crate::AppState;
 use crate::extractors::AuthUser;
 use api_types::{CreateWidgetDto, WidgetDto};
-use application::ConfigService;
+
 use axum::{
     extract::{Path, State},
     http::StatusCode,
@@ -65,7 +65,7 @@ where
     let widget = body
         .into_domain()
         .map_err(|e| (StatusCode::BAD_REQUEST, e))?;
-    let svc = ConfigService::new(state.config.as_ref(), state.events.as_ref());
+    let svc = state.config_service();
     svc.create_widget(widget)
         .await
         .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("{e}")))?;
@@ -87,7 +87,7 @@ where
     let widget = body
         .into_domain()
         .map_err(|e| (StatusCode::BAD_REQUEST, e))?;
-    let svc = ConfigService::new(state.config.as_ref(), state.events.as_ref());
+    let svc = state.config_service();
     svc.update_widget(widget)
         .await
         .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, format!("{e}")))?;
@@ -105,7 +105,7 @@ where
     E: EventPublisher,
     E::Error: std::fmt::Debug,
 {
-    let svc = ConfigService::new(state.config.as_ref(), state.events.as_ref());
+    let svc = state.config_service();
     svc.delete_widget(id)
         .await
         .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;
@@ -126,32 +126,10 @@ where
 {
     match state.widget_states.get_widget_state(id).await {
         Some(ws) => {
-            let map: serde_json::Map<String, serde_json::Value> = ws
-                .data
-                .iter()
-                .map(|(k, v)| (k.clone(), domain_value_to_json(v)))
-                .collect();
+            let map: serde_json::Map<String, serde_json::Value> =
+                ws.data.iter().map(|(k, v)| (k.clone(), v.into())).collect();
             Ok(Json(serde_json::Value::Object(map)))
         }
         None => Err(StatusCode::NOT_FOUND),
     }
 }
-
-fn domain_value_to_json(v: &domain::Value) -> serde_json::Value {
-    match v {
-        domain::Value::Null => serde_json::Value::Null,
-        domain::Value::Bool(b) => serde_json::Value::Bool(*b),
-        domain::Value::Number(n) => serde_json::json!(n),
-        domain::Value::String(s) => serde_json::Value::String(s.clone()),
-        domain::Value::Array(arr) => {
-            serde_json::Value::Array(arr.iter().map(domain_value_to_json).collect())
-        }
-        domain::Value::Object(obj) => {
-            let map = obj
-                .iter()
-                .map(|(k, v)| (k.clone(), domain_value_to_json(v)))
-                .collect();
-            serde_json::Value::Object(map)
-        }
-    }
-}

crates/adapters/http-json/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-domain.workspace = true
+domain = { workspace = true, features = ["json"] }
 reqwest.workspace = true
 serde_json.workspace = true
 thiserror.workspace = true

crates/adapters/http-json/src/lib.rs

@@ -28,21 +28,6 @@ impl HttpJsonAdapter {
     }
 }
 
-fn json_to_value(json: serde_json::Value) -> Value {
-    match json {
-        serde_json::Value::Null => Value::Null,
-        serde_json::Value::Bool(b) => Value::Bool(b),
-        serde_json::Value::Number(n) => Value::Number(n.as_f64().unwrap_or(0.0)),
-        serde_json::Value::String(s) => Value::String(s),
-        serde_json::Value::Array(arr) => Value::Array(arr.into_iter().map(json_to_value).collect()),
-        serde_json::Value::Object(map) => Value::Object(
-            map.into_iter()
-                .map(|(k, v)| (k, json_to_value(v)))
-                .collect(),
-        ),
-    }
-}
-
 impl DataSourcePort for HttpJsonAdapter {
     type Error = HttpJsonError;
 
@@ -70,6 +55,6 @@ impl DataSourcePort for HttpJsonAdapter {
         let resp = req.send().await.map_err(HttpJsonError::Request)?;
         let json: serde_json::Value = resp.json().await.map_err(HttpJsonError::Request)?;
 
-        Ok(json_to_value(json))
+        Ok(json.into())
     }
 }

crates/adapters/tcp-server/src/broadcaster.rs

@@ -1,6 +1,7 @@
+use crate::conversions::{display_hint_to_wire, layout_to_wire, widget_state_to_wire};
 use crate::error::TcpServerError;
 use domain::{BroadcastPort, DisplayHint, Layout, ThemeConfig, WidgetId, WidgetState};
-use protocol::{ServerMessage, WidgetDescriptor, WireColor, WireLayoutNode, WireTheme, encode};
+use protocol::{ServerMessage, WidgetDescriptor, WireColor, WireTheme, encode};
 use tokio::sync::broadcast;
 
 pub struct TcpBroadcaster {
@@ -31,13 +32,13 @@ impl BroadcastPort for TcpBroadcaster {
         layout: &Layout,
         widgets: &[(WidgetId, DisplayHint, WidgetState)],
     ) -> Result<(), Self::Error> {
-        let wire_layout: WireLayoutNode = (&layout.root).into();
+        let wire_layout = layout_to_wire(&layout.root);
         let wire_widgets: Vec<WidgetDescriptor> = widgets
             .iter()
             .map(|(id, hint, state)| WidgetDescriptor {
                 id: *id,
-                display_hint: hint.into(),
-                state: state.into(),
+                display_hint: display_hint_to_wire(hint),
+                state: widget_state_to_wire(state),
             })
             .collect();
 
@@ -58,8 +59,8 @@ impl BroadcastPort for TcpBroadcaster {
             .iter()
             .map(|(id, hint, state)| WidgetDescriptor {
                 id: *id,
-                display_hint: hint.into(),
-                state: state.into(),
+                display_hint: display_hint_to_wire(hint),
+                state: widget_state_to_wire(state),
             })
             .collect();
 

crates/adapters/tcp-server/src/conversions.rs

@@ -0,0 +1,103 @@
+use domain::value_objects::{
+    AlignItems, Direction, DisplayHint, DisplayHintKind, HAlign, JustifyContent, LayoutNode,
+    Sizing, VAlign, Value, WidgetError, WidgetState,
+};
+use protocol::{
+    WireAlignItems, WireContainerNode, WireDirection, WireDisplayHint, WireDisplayHintKind,
+    WireHAlign, WireJustifyContent, WireKeyValue, WireLayoutChild, WireLayoutNode, WireSizing,
+    WireVAlign, WireValue, WireWidgetError, WireWidgetState,
+};
+
+pub fn value_to_wire(v: &Value) -> WireValue {
+    match v {
+        Value::Null => WireValue::Null,
+        Value::Bool(b) => WireValue::Bool(*b),
+        Value::Number(n) => WireValue::Number(*n),
+        Value::String(s) => WireValue::String(s.clone()),
+        Value::Array(arr) => WireValue::Array(arr.iter().map(value_to_wire).collect()),
+        Value::Object(map) => WireValue::Object(
+            map.iter()
+                .map(|(k, v)| (k.clone(), value_to_wire(v)))
+                .collect(),
+        ),
+    }
+}
+
+pub fn widget_error_to_wire(e: &WidgetError) -> WireWidgetError {
+    match e {
+        WidgetError::SourceUnavailable => WireWidgetError::SourceUnavailable,
+        WidgetError::ExtractionFailed => WireWidgetError::ExtractionFailed,
+    }
+}
+
+pub fn widget_state_to_wire(s: &WidgetState) -> WireWidgetState {
+    WireWidgetState {
+        data: s
+            .data
+            .iter()
+            .map(|(k, v)| WireKeyValue {
+                key: k.clone(),
+                value: value_to_wire(v),
+            })
+            .collect(),
+        error: s.error.as_ref().map(widget_error_to_wire),
+    }
+}
+
+pub fn display_hint_to_wire(h: &DisplayHint) -> WireDisplayHint {
+    WireDisplayHint {
+        kind: match h.kind {
+            DisplayHintKind::IconValue => WireDisplayHintKind::IconValue,
+            DisplayHintKind::TextBlock => WireDisplayHintKind::TextBlock,
+            DisplayHintKind::KeyValue => WireDisplayHintKind::KeyValue,
+        },
+        h_align: match h.h_align {
+            HAlign::Left => WireHAlign::Left,
+            HAlign::Center => WireHAlign::Center,
+            HAlign::Right => WireHAlign::Right,
+        },
+        v_align: match h.v_align {
+            VAlign::Top => WireVAlign::Top,
+            VAlign::Middle => WireVAlign::Middle,
+            VAlign::Bottom => WireVAlign::Bottom,
+        },
+    }
+}
+
+pub fn layout_to_wire(n: &LayoutNode) -> WireLayoutNode {
+    match n {
+        LayoutNode::Leaf(id) => WireLayoutNode::Leaf(*id),
+        LayoutNode::Container(c) => WireLayoutNode::Container(WireContainerNode {
+            direction: match c.direction {
+                Direction::Row => WireDirection::Row,
+                Direction::Column => WireDirection::Column,
+            },
+            gap: c.gap,
+            padding: c.padding,
+            justify_content: match c.justify_content {
+                JustifyContent::Start => WireJustifyContent::Start,
+                JustifyContent::Center => WireJustifyContent::Center,
+                JustifyContent::End => WireJustifyContent::End,
+                JustifyContent::SpaceBetween => WireJustifyContent::SpaceBetween,
+                JustifyContent::SpaceEvenly => WireJustifyContent::SpaceEvenly,
+            },
+            align_items: match c.align_items {
+                AlignItems::Start => WireAlignItems::Start,
+                AlignItems::Center => WireAlignItems::Center,
+                AlignItems::End => WireAlignItems::End,
+                AlignItems::Stretch => WireAlignItems::Stretch,
+            },
+            children: c
+                .children
+                .iter()
+                .map(|ch| WireLayoutChild {
+                    sizing: match ch.sizing {
+                        Sizing::Fixed(px) => WireSizing::Fixed(px),
+                        Sizing::Flex(w) => WireSizing::Flex(w),
+                    },
+                    node: layout_to_wire(&ch.node),
+                })
+                .collect(),
+        }),
+    }
+}

crates/adapters/tcp-server/src/lib.rs

@@ -1,5 +1,6 @@
 mod broadcaster;
 mod client_tracker;
+mod conversions;
 mod error;
 mod event_bus;
 mod server;

crates/adapters/tcp-server/src/server.rs

@@ -1,8 +1,9 @@
 use crate::broadcaster::domain_theme_to_wire;
 use crate::client_tracker::ClientTracker;
+use crate::conversions::{display_hint_to_wire, layout_to_wire, widget_state_to_wire};
 use crate::error::TcpServerError;
 use domain::{ConfigRepository, WidgetStateReader};
-use protocol::{ServerMessage, WidgetDescriptor, WireLayoutNode, encode};
+use protocol::{ServerMessage, WidgetDescriptor, encode};
 use std::sync::Arc;
 use tokio::io::AsyncWriteExt;
 use tokio::net::TcpListener;
@@ -87,14 +88,14 @@ where
         }
     };
 
-    let wire_layout: WireLayoutNode = (&layout.root).into();
+    let wire_layout = layout_to_wire(&layout.root);
     let mut wire_widgets = Vec::new();
     for w in &widgets {
         if let Some(s) = widget_states.get_widget_state(w.id).await {
             wire_widgets.push(WidgetDescriptor {
                 id: w.id,
-                display_hint: (&w.display_hint).into(),
-                state: (&s).into(),
+                display_hint: display_hint_to_wire(&w.display_hint),
+                state: widget_state_to_wire(&s),
             });
         }
     }

crates/application/Cargo.toml

@@ -7,6 +7,8 @@ edition = "2024"
 domain.workspace = true
 thiserror.workspace = true
 tokio.workspace = true
+anyhow.workspace = true
+tracing.workspace = true
 
 [dev-dependencies]
 tokio = { workspace = true }

crates/application/src/auth_service.rs

@@ -1,4 +1,4 @@
-use domain::{AuthPort, ConfigRepository, PasswordHashPort, User};
+use domain::{AuthPort, PasswordHashPort, User, UserRepository};
 
 pub enum AuthError<E> {
     InvalidCredentials,
@@ -26,7 +26,7 @@ pub async fn login<C, A, H>(
     password: &str,
 ) -> Result<String, AuthError<C::Error>>
 where
-    C: ConfigRepository,
+    C: UserRepository,
     A: AuthPort,
     H: PasswordHashPort,
 {
@@ -55,7 +55,7 @@ pub async fn register<C, H>(
     password: &str,
 ) -> Result<(), AuthError<C::Error>>
 where
-    C: ConfigRepository,
+    C: UserRepository,
     H: PasswordHashPort,
 {
     let count = config.count_users().await.map_err(AuthError::Repository)?;

crates/application/src/data_projection.rs

@@ -19,6 +19,13 @@ impl DataProjection {
         Self::default()
     }
 
+    pub async fn seed(&self, states: Vec<(WidgetId, WidgetState)>) {
+        let mut current = self.current.lock().await;
+        for (id, state) in states {
+            current.insert(id, state);
+        }
+    }
+
     pub async fn get_state(&self, widget_id: WidgetId) -> Option<WidgetState> {
         self.current.lock().await.get(&widget_id).cloned()
     }

crates/application/src/event_service.rs

@@ -0,0 +1,123 @@
+use crate::DataProjection;
+use domain::{
+    BroadcastPort, ConfigRepository, DomainEvent, Layout, Value, WidgetConfig, WidgetState,
+};
+use std::sync::Arc;
+use tracing::{error, info, warn};
+
+pub async fn handle_event<C, B>(
+    event: DomainEvent,
+    config: &Arc<C>,
+    broadcaster: &Arc<B>,
+    projection: &Arc<DataProjection>,
+) where
+    C: ConfigRepository,
+    C::Error: std::fmt::Display,
+    B: BroadcastPort,
+    B::Error: std::fmt::Display,
+{
+    match event {
+        DomainEvent::LayoutChanged { layout } => {
+            handle_layout_changed(&layout, config, broadcaster, projection).await;
+        }
+        DomainEvent::WebhookDataReceived { source_id, data } => {
+            handle_webhook_data(source_id, &data, config, broadcaster, projection).await;
+        }
+        DomainEvent::ThemeChanged { theme } => {
+            if let Err(e) = broadcaster.push_theme_update(&theme).await {
+                error!(error = %e, "failed to push theme update");
+            }
+            info!("theme changed, pushed update to clients");
+        }
+        _ => {}
+    }
+}
+
+async fn handle_layout_changed<C, B>(
+    layout: &Layout,
+    config: &Arc<C>,
+    broadcaster: &Arc<B>,
+    projection: &Arc<DataProjection>,
+) where
+    C: ConfigRepository,
+    C::Error: std::fmt::Display,
+    B: BroadcastPort,
+    B::Error: std::fmt::Display,
+{
+    let widgets = match config.list_widgets().await {
+        Ok(w) => w,
+        Err(e) => {
+            error!(error = %e, "failed to fetch widgets for screen update");
+            return;
+        }
+    };
+
+    let mut widget_states = Vec::new();
+    for w in &widgets {
+        if let Some(s) = projection.get_state(w.id).await {
+            widget_states.push((w.id, w.display_hint.clone(), s));
+        }
+    }
+
+    if let Err(e) = broadcaster.push_screen_update(layout, &widget_states).await {
+        error!(error = %e, "failed to push screen update");
+    }
+
+    info!("layout changed, pushed screen update to clients");
+}
+
+async fn handle_webhook_data<C, B>(
+    source_id: u16,
+    data: &Value,
+    config: &Arc<C>,
+    broadcaster: &Arc<B>,
+    projection: &Arc<DataProjection>,
+) where
+    C: ConfigRepository,
+    C::Error: std::fmt::Display,
+    B: BroadcastPort,
+    B::Error: std::fmt::Display,
+{
+    let widgets = match config.list_widgets().await {
+        Ok(w) => w,
+        Err(e) => {
+            error!(error = %e, "failed to fetch widgets for webhook");
+            return;
+        }
+    };
+
+    let changed = apply_and_broadcast(source_id, data, &widgets, broadcaster, projection).await;
+    if !changed.is_empty() {
+        info!(source_id, count = changed.len(), "webhook data pushed");
+    }
+}
+
+pub async fn apply_and_broadcast<B>(
+    source_id: u16,
+    data: &Value,
+    widgets: &[WidgetConfig],
+    broadcaster: &Arc<B>,
+    projection: &Arc<DataProjection>,
+) -> Vec<(u16, WidgetState)>
+where
+    B: BroadcastPort,
+    B::Error: std::fmt::Display,
+{
+    let changed: Vec<(u16, WidgetState)> =
+        projection.apply_poll_result(source_id, data, widgets).await;
+
+    if !changed.is_empty() {
+        let with_hints: Vec<_> = changed
+            .iter()
+            .filter_map(|(id, state)| {
+                let hint = widgets.iter().find(|w| w.id == *id)?.display_hint.clone();
+                Some((*id, hint, state.clone()))
+            })
+            .collect();
+        if let Err(e) = broadcaster.push_data_update(&with_hints).await {
+            warn!(error = %e, "failed to push update");
+        }
+    }
+
+    changed
+}

crates/application/src/lib.rs

@@ -1,6 +1,8 @@
 pub mod auth_service;
 mod config_service;
 mod data_projection;
+pub mod event_service;
+pub mod polling_service;
 
 pub use config_service::ConfigService;
 pub use data_projection::DataProjection;

crates/application/src/polling_service.rs

@@ -0,0 +1,254 @@
+use crate::DataProjection;
+use domain::{
+    BroadcastPort, ConfigRepository, DataSource, Value, WidgetConfig, WidgetError, WidgetState,
+    WidgetStateCache,
+};
+use std::collections::{HashMap, HashSet};
+use std::future::Future;
+use std::sync::Arc;
+use std::time::Duration;
+use tokio::task::JoinHandle;
+use tracing::{debug, info, warn};
+
+const SOURCE_REFRESH_INTERVAL: Duration = Duration::from_secs(30);
+
+pub async fn run<C, B, P, F>(
+    config: Arc<C>,
+    broadcaster: Arc<B>,
+    projection: Arc<DataProjection>,
+    poller: Arc<P>,
+) where
+    C: ConfigRepository + WidgetStateCache + Send + Sync + 'static,
+    <C as ConfigRepository>::Error: std::fmt::Display + Send,
+    <C as WidgetStateCache>::Error: std::fmt::Display + Send,
+    B: BroadcastPort + Send + Sync + 'static,
+    B::Error: std::fmt::Display + Send,
+    P: Fn(&DataSource) -> F + Send + Sync + 'static,
+    F: Future<Output = Result<Value, anyhow::Error>> + Send,
+{
+    let mut running: HashMap<u16, JoinHandle<()>> = HashMap::new();
+    let mut static_done: HashSet<u16> = HashSet::new();
+
+    info!("polling manager started");
+
+    loop {
+        let sources = match config.list_data_sources().await {
+            Ok(s) => s,
+            Err(e) => {
+                warn!(error = %e, "failed to list data sources");
+                tokio::time::sleep(SOURCE_REFRESH_INTERVAL).await;
+                continue;
+            }
+        };
+
+        let current_ids: Vec<u16> = sources.iter().map(|s| s.id).collect();
+
+        running.retain(|id, handle| {
+            if !current_ids.contains(id) {
+                info!(source_id = id, "stopping poll for removed source");
+                handle.abort();
+                false
+            } else {
+                true
+            }
+        });
+        static_done.retain(|id| current_ids.contains(id));
+
+        for source in &sources {
+            if source.source_type == domain::DataSourceType::Webhook {
+                continue;
+            }
+
+            if source.source_type == domain::DataSourceType::StaticText {
+                if static_done.contains(&source.id) {
+                    continue;
+                }
+                poll_and_broadcast(&*poller, source, &config, &broadcaster, &projection).await;
+                static_done.insert(source.id);
+                continue;
+            }
+
+            if running.contains_key(&source.id) {
+                continue;
+            }
+
+            let source_id = source.id;
+            let source = source.clone();
+            let config = config.clone();
+            let broadcaster = broadcaster.clone();
+            let projection = projection.clone();
+            let poller = poller.clone();
+
+            info!(
+                source_id = source.id,
+                name = %source.name,
+                interval_secs = source.poll_interval.as_secs(),
+                "starting poll task"
+            );
+
+            let handle = tokio::spawn(async move {
+                poll_loop(source, config, broadcaster, projection, poller).await;
+            });
+
+            running.insert(source_id, handle);
+        }
+
+        if running.is_empty() && static_done.is_empty() {
+            debug!("no pollable sources, waiting");
+        }
+
+        tokio::time::sleep(SOURCE_REFRESH_INTERVAL).await;
+    }
+}
+
+async fn poll_and_broadcast<C, B, P, F>(
+    poller: &P,
+    source: &DataSource,
+    config: &Arc<C>,
+    broadcaster: &Arc<B>,
+    projection: &Arc<DataProjection>,
+) where
+    C: ConfigRepository + WidgetStateCache,
+    <C as ConfigRepository>::Error: std::fmt::Display,
+    <C as WidgetStateCache>::Error: std::fmt::Display,
+    B: BroadcastPort,
+    B::Error: std::fmt::Display,
+    P: Fn(&DataSource) -> F,
+    F: Future<Output = Result<Value, anyhow::Error>>,
+{
+    let result = match poller(source).await {
+        Ok(v) => v,
+        Err(e) => {
+            warn!(source = %source.name, error = %e, "poll failed");
+            return;
+        }
+    };
+    let widgets = match config.list_widgets().await {
+        Ok(w) => w,
+        Err(e) => {
+            warn!(error = %e, "failed to fetch widgets");
+            return;
+        }
+    };
+    let changed = crate::event_service::apply_and_broadcast(
+        source.id,
+        &result,
+        &widgets,
+        broadcaster,
+        projection,
+    )
+    .await;
+    if !changed.is_empty() {
+        if let Err(e) = config.save_widget_states(&changed).await {
+            warn!(error = %e, "failed to cache widget states");
+        }
+        info!(source = %source.name, count = changed.len(), "pushed widget updates");
+    }
+}
+
+async fn poll_loop<C, B, P, F>(
+    source: DataSource,
+    config: Arc<C>,
+    broadcaster: Arc<B>,
+    projection: Arc<DataProjection>,
+    poller: Arc<P>,
+) where
+    C: ConfigRepository + WidgetStateCache,
+    <C as ConfigRepository>::Error: std::fmt::Display,
+    <C as WidgetStateCache>::Error: std::fmt::Display,
+    B: BroadcastPort,
+    B::Error: std::fmt::Display,
+    P: Fn(&DataSource) -> F,
+    F: Future<Output = Result<Value, anyhow::Error>>,
+{
+    let interval = source.poll_interval;
+    let mut widgets = match config.list_widgets().await {
+        Ok(w) => w,
+        Err(e) => {
+            warn!(error = %e, "failed to fetch initial widget list");
+            vec![]
+        }
+    };
+    let mut last_refresh = tokio::time::Instant::now();
+
+    loop {
+        let result = match poller(&source).await {
+            Ok(v) => v,
+            Err(e) => {
+                warn!(source = %source.name, error = %e, "poll failed");
+                broadcast_errors(&source, &widgets, &broadcaster, &projection).await;
+                tokio::time::sleep(interval).await;
+                continue;
+            }
+        };
+
+        if last_refresh.elapsed() >= SOURCE_REFRESH_INTERVAL {
+            if let Ok(w) = config.list_widgets().await {
+                widgets = w;
+            }
+            last_refresh = tokio::time::Instant::now();
+        }
+
+        let changed = crate::event_service::apply_and_broadcast(
+            source.id,
+            &result,
+            &widgets,
+            &broadcaster,
+            &projection,
+        )
+        .await;
+        if !changed.is_empty() {
+            if let Err(e) = config.save_widget_states(&changed).await {
+                warn!(error = %e, "failed to cache widget states");
+            }
+            info!(source = %source.name, count = changed.len(), "pushed widget updates");
+        }
+
+        tokio::time::sleep(interval).await;
+    }
+}
+
+async fn broadcast_errors<B>(
+    source: &DataSource,
+    widgets: &[WidgetConfig],
+    broadcaster: &Arc<B>,
+    projection: &Arc<DataProjection>,
+) where
+    B: BroadcastPort,
+    B::Error: std::fmt::Display,
+{
+    let affected: Vec<_> = widgets
+        .iter()
+        .filter(|w| w.data_source_id == source.id)
+        .collect();
+
+    if affected.is_empty() {
+        return;
+    }
+
+    let mut error_states = Vec::new();
+    for w in &affected {
+        let mut state = projection
+            .get_state(w.id)
+            .await
+            .unwrap_or_else(|| WidgetState {
+                data: std::collections::BTreeMap::new(),
+                error: None,
+            });
+        state.error = Some(WidgetError::SourceUnavailable);
+        error_states.push((w.id, state));
+    }
+
+    projection.seed(error_states.clone()).await;
+
+    let with_hints: Vec<_> = error_states
+        .iter()
+        .filter_map(|(id, state)| {
+            let hint = affected.iter().find(|w| w.id == *id)?.display_hint.clone();
+            Some((*id, hint, state.clone()))
+        })
+        .collect();
+    if let Err(e) = broadcaster.push_data_update(&with_hints).await {
+        warn!(error = %e, "failed to push error update");
+    }
+}

crates/application/tests/support/mod.rs

@@ -1,6 +1,7 @@
 use domain::{
     ConfigRepository, DataSource, DataSourceId, DomainEvent, EventPublisher, Layout, LayoutPreset,
-    LayoutPresetId, ThemeConfig, User, WidgetConfig, WidgetId,
+    LayoutPresetId, ThemeConfig, User, UserRepository, WidgetConfig, WidgetId, WidgetState,
+    WidgetStateCache,
 };
 use std::collections::HashMap;
 use std::sync::Mutex;
@@ -123,6 +124,10 @@ impl ConfigRepository for InMemoryConfigRepository {
         self.presets.lock().unwrap().remove(&id);
         Ok(())
     }
+}
+
+impl UserRepository for InMemoryConfigRepository {
+    type Error = Never;
 
     async fn get_user_by_username(&self, _username: &str) -> Result<Option<User>, Self::Error> {
         Ok(None)
@@ -137,6 +142,21 @@ impl ConfigRepository for InMemoryConfigRepository {
     }
 }
 
+impl WidgetStateCache for InMemoryConfigRepository {
+    type Error = Never;
+
+    async fn save_widget_states(
+        &self,
+        _states: &[(WidgetId, WidgetState)],
+    ) -> Result<(), Self::Error> {
+        Ok(())
+    }
+
+    async fn load_widget_states(&self) -> Result<Vec<(WidgetId, WidgetState)>, Self::Error> {
+        Ok(vec![])
+    }
+}
+
 pub struct InMemoryEventPublisher {
     events: Mutex<Vec<DomainEvent>>,
 }

crates/bootstrap/src/config.rs

@@ -4,7 +4,6 @@ pub struct ServerConfig {
     pub database_url: String,
     pub tcp_addr: String,
     pub http_addr: String,
-    pub poll_interval_secs: u64,
     pub spa_dir: Option<String>,
 }
 
@@ -15,10 +14,6 @@ impl ServerConfig {
                 .unwrap_or_else(|_| "sqlite:kframe.db?mode=rwc".into()),
             tcp_addr: env::var("KFRAME_TCP_ADDR").unwrap_or_else(|_| "0.0.0.0:2699".into()),
             http_addr: env::var("KFRAME_HTTP_ADDR").unwrap_or_else(|_| "0.0.0.0:3000".into()),
-            poll_interval_secs: env::var("KFRAME_POLL_INTERVAL_SECS")
-                .ok()
-                .and_then(|v| v.parse().ok())
-                .unwrap_or(5),
             spa_dir: env::var("KFRAME_SPA_DIR").ok(),
         }
     }

crates/bootstrap/src/event_handler.rs

@@ -1,9 +1,8 @@
 use application::DataProjection;
 use config_sqlite::SqliteConfigStore;
-use domain::{BroadcastPort, ConfigRepository, DomainEvent};
 use std::sync::Arc;
 use tcp_server::{TcpBroadcaster, TcpEventBus};
-use tracing::{error, info, warn};
+use tracing::{error, warn};
 
 pub async fn run(
     event_bus: Arc<TcpEventBus>,
@@ -15,69 +14,10 @@ pub async fn run(
 
     loop {
         match rx.recv().await {
-            Ok(DomainEvent::LayoutChanged { layout }) => {
-                let widgets = match config.list_widgets().await {
-                    Ok(w) => w,
-                    Err(e) => {
-                        error!(error = %e, "failed to fetch widgets for screen update");
-                        continue;
-                    }
-                };
-
-                let mut widget_states = Vec::new();
-                for w in &widgets {
-                    if let Some(s) = projection.get_state(w.id).await {
-                        widget_states.push((w.id, w.display_hint.clone(), s));
-                    }
-                }
-
-                if let Err(e) = broadcaster
-                    .push_screen_update(&layout, &widget_states)
-                    .await
-                {
-                    error!(error = %e, "failed to push screen update");
-                }
-
-                info!("layout changed, pushed screen update to clients");
-            }
-            Ok(DomainEvent::WebhookDataReceived { source_id, data }) => {
-                let widgets = match config.list_widgets().await {
-                    Ok(w) => w,
-                    Err(e) => {
-                        error!(error = %e, "failed to fetch widgets for webhook");
-                        continue;
-                    }
-                };
-
-                let changed = projection
-                    .apply_poll_result(source_id, &data, &widgets)
+            Ok(event) => {
+                application::event_service::handle_event(event, &config, &broadcaster, &projection)
                     .await;
-
-                if !changed.is_empty() {
-                    let with_hints: Vec<_> = changed
-                        .iter()
-                        .filter_map(|(id, state)| {
-                            let hint = widgets.iter().find(|w| w.id == *id)?.display_hint.clone();
-                            Some((*id, hint, state.clone()))
-                        })
-                        .collect();
-                    if let Err(e) = broadcaster.push_data_update(&with_hints).await {
-                        error!(error = %e, "failed to push webhook data update");
-                    }
-                    info!(
-                        source_id,
-                        count = changed.len(),
-                        "webhook data received, pushed update"
-                    );
-                }
             }
-            Ok(DomainEvent::ThemeChanged { theme }) => {
-                if let Err(e) = broadcaster.push_theme_update(&theme).await {
-                    error!(error = %e, "failed to push theme update");
-                }
-                info!("theme changed, pushed update to clients");
-            }
-            Ok(_) => {}
             Err(tokio::sync::broadcast::error::RecvError::Lagged(n)) => {
                 warn!(skipped = n, "event handler lagged, missed events");
             }

crates/bootstrap/src/main.rs

@@ -5,12 +5,13 @@ mod polling;
 use anyhow::Result;
 use application::DataProjection;
 use config_sqlite::SqliteConfigStore;
+use domain::WidgetStateCache;
 use http_api::AppState;
 use kframe_auth::{Argon2Hasher, AuthConfig, JwtAuthService};
 use secret_store::AesSecretStore;
 use std::sync::Arc;
 use tcp_server::{ClientTracker, TcpBroadcaster, TcpEventBus, run_tcp_server};
-use tracing::{error, info};
+use tracing::{error, info, warn};
 
 #[tokio::main]
 async fn main() -> Result<()> {
@@ -40,6 +41,15 @@ async fn main() -> Result<()> {
     let auth = Arc::new(JwtAuthService::new(auth_config));
     let hasher = Arc::new(Argon2Hasher);
 
+    match config_store.load_widget_states().await {
+        Ok(states) if !states.is_empty() => {
+            info!(count = states.len(), "loaded cached widget states");
+            projection.seed(states).await;
+        }
+        Ok(_) => {}
+        Err(e) => warn!(error = %e, "failed to load cached widget states"),
+    }
+
     let tcp_addr = cfg.tcp_addr.clone();
     let tcp_bc = broadcaster.clone();
     let tcp_tracker = tracker.clone();
@@ -80,11 +90,5 @@ async fn main() -> Result<()> {
         event_handler::run(ev_bus, ev_config, ev_bc, ev_proj).await;
     });
 
-    polling::run(
-        config_store,
-        broadcaster,
-        projection,
-        cfg.poll_interval_secs,
-    )
-    .await
+    polling::run(config_store, broadcaster, projection).await
 }

crates/bootstrap/src/polling.rs

@@ -2,20 +2,12 @@ use anyhow::Result;
 use application::DataProjection;
 use config_sqlite::SqliteConfigStore;
 use data_generators::{ClockGenerator, StaticTextGenerator};
-use domain::{
-    BroadcastPort, ConfigRepository, DataSource, DataSourcePort, DataSourceType, Value, WidgetState,
-};
+use domain::{DataSource, DataSourcePort, DataSourceType, Value};
 use http_json::HttpJsonAdapter;
 use media_adapter::MediaAdapter;
 use rss_adapter::RssAdapter;
-use std::collections::HashMap;
 use std::sync::Arc;
-use std::time::Duration;
 use tcp_server::TcpBroadcaster;
-use tokio::task::JoinHandle;
-use tracing::{debug, info, warn};
-
-const SOURCE_REFRESH_INTERVAL: Duration = Duration::from_secs(30);
 
 #[derive(Clone)]
 struct Adapters {
@@ -65,7 +57,6 @@ pub async fn run(
     config: Arc<SqliteConfigStore>,
     broadcaster: Arc<TcpBroadcaster>,
     projection: Arc<DataProjection>,
-    _poll_interval_secs: u64,
 ) -> Result<()> {
     let adapters = Adapters {
         http: Arc::new(HttpJsonAdapter::new()),
@@ -75,109 +66,12 @@ pub async fn run(
         static_text: Arc::new(StaticTextGenerator::new()),
     };
 
-    let mut running: HashMap<u16, JoinHandle<()>> = HashMap::new();
+    let poller = Arc::new(move |source: &DataSource| {
+        let adapters = adapters.clone();
+        let source = source.clone();
+        async move { adapters.poll(&source).await }
+    });
 
-    info!("polling manager started");
-
-    loop {
-        let sources = config
-            .list_data_sources()
-            .await
-            .map_err(|e| anyhow::anyhow!("{e}"))?;
-
-        let current_ids: Vec<u16> = sources.iter().map(|s| s.id).collect();
-
-        running.retain(|id, handle| {
-            if !current_ids.contains(id) {
-                info!(source_id = id, "stopping poll for removed source");
-                handle.abort();
-                false
-            } else {
-                true
-            }
-        });
-
-        for source in &sources {
-            if source.source_type == DataSourceType::Webhook {
-                continue;
-            }
-            if running.contains_key(&source.id) {
-                continue;
-            }
-
-            let source_id = source.id;
-            let source = source.clone();
-            let config = config.clone();
-            let broadcaster = broadcaster.clone();
-            let projection = projection.clone();
-            let adapters = adapters.clone();
-
-            info!(
-                source_id = source.id,
-                name = %source.name,
-                interval_secs = source.poll_interval.as_secs(),
-                "starting poll task"
-            );
-
-            let handle = tokio::spawn(async move {
-                poll_loop(source, config, broadcaster, projection, adapters).await;
-            });
-
-            running.insert(source_id, handle);
-        }
-
-        if running.is_empty() {
-            debug!("no pollable sources, waiting");
-        }
-
-        tokio::time::sleep(SOURCE_REFRESH_INTERVAL).await;
-    }
-}
-
-async fn poll_loop(
-    source: DataSource,
-    config: Arc<SqliteConfigStore>,
-    broadcaster: Arc<TcpBroadcaster>,
-    projection: Arc<DataProjection>,
-    adapters: Adapters,
-) {
-    let interval = source.poll_interval;
-
-    loop {
-        tokio::time::sleep(interval).await;
-
-        let result = match adapters.poll(&source).await {
-            Ok(v) => v,
-            Err(e) => {
-                warn!(source = %source.name, error = %e, "poll failed");
-                continue;
-            }
-        };
-
-        let widgets = match config.list_widgets().await {
-            Ok(w) => w,
-            Err(e) => {
-                warn!(error = %e, "failed to fetch widgets");
-                continue;
-            }
-        };
-
-        let changed: Vec<(u16, WidgetState)> = projection
-            .apply_poll_result(source.id, &result, &widgets)
-            .await;
-
-        if !changed.is_empty() {
-            let with_hints: Vec<_> = changed
-                .iter()
-                .filter_map(|(id, state)| {
-                    let hint = widgets.iter().find(|w| w.id == *id)?.display_hint.clone();
-                    Some((*id, hint, state.clone()))
-                })
-                .collect();
-            if let Err(e) = broadcaster.push_data_update(&with_hints).await {
-                warn!(error = %e, "failed to push update");
-            }
-            info!(source = %source.name, count = changed.len(), "pushed widget updates");
-        }
-    }
+    application::polling_service::run(config, broadcaster, projection, poller).await;
+    Ok(())
 }

crates/client-application/src/client_app.rs

@@ -1,24 +1,24 @@
+use crate::conversions::{wire_to_display_hint, wire_to_layout, wire_to_widget_state};
 use client_domain::{BoundingBox, Color, LayoutEngine, RenderTree, ThemeConfig};
-use domain::LayoutNode;
-use protocol::{
-    ServerMessage, WidgetDescriptor, WireColor, WireDisplayHint, WireLayoutNode, WireWidgetState,
-};
+use domain::{DisplayHint, Value, WidgetError, WidgetState};
+use protocol::{ServerMessage, WidgetDescriptor, WireColor, WireLayoutNode};
 use std::collections::HashMap;
 
 pub struct ClientApp {
     screen: BoundingBox,
     render_tree: Option<RenderTree>,
-    widget_states: HashMap<u16, (WireDisplayHint, WireWidgetState)>,
+    widget_states: HashMap<u16, (DisplayHint, WidgetState)>,
     theme: ThemeConfig,
     theme_changed: bool,
 }
 
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone)]
 pub struct RepaintCommand {
     pub widget_id: u16,
     pub bounds: BoundingBox,
-    pub display_hint: WireDisplayHint,
-    pub state: WireWidgetState,
+    pub display_hint: DisplayHint,
+    pub data: Vec<(String, Value)>,
+    pub error: Option<WidgetError>,
 }
 
 impl ClientApp {
@@ -73,13 +73,14 @@ impl ClientApp {
         wire_layout: WireLayoutNode,
         widgets: Vec<WidgetDescriptor>,
     ) -> Vec<RepaintCommand> {
-        let layout: LayoutNode = wire_layout.into();
+        let layout = wire_to_layout(wire_layout);
         let new_tree = LayoutEngine::compute(&layout, self.screen);
 
         self.widget_states.clear();
-        for w in &widgets {
-            self.widget_states
-                .insert(w.id, (w.display_hint.clone(), w.state.clone()));
+        for w in widgets {
+            let hint = wire_to_display_hint(w.display_hint);
+            let state = wire_to_widget_state(w.state);
+            self.widget_states.insert(w.id, (hint, state));
         }
 
         let repaints = self.build_repaints_for_all(&new_tree);
@@ -96,21 +97,19 @@ impl ClientApp {
         let mut repaints = Vec::new();
 
         for w in widgets {
+            let hint = wire_to_display_hint(w.display_hint);
+            let state = wire_to_widget_state(w.state);
+
             let changed = self
                 .widget_states
                 .get(&w.id)
-                .is_none_or(|(_, prev_state)| *prev_state != w.state);
+                .is_none_or(|(_, prev)| *prev != state);
 
             if changed {
                 if let Some(bounds) = tree.get_widget_bounds(w.id) {
-                    repaints.push(RepaintCommand {
-                        widget_id: w.id,
-                        bounds: *bounds,
-                        display_hint: w.display_hint.clone(),
-                        state: w.state.clone(),
-                    });
+                    repaints.push(Self::make_repaint(w.id, *bounds, &hint, &state));
                 }
-                self.widget_states.insert(w.id, (w.display_hint, w.state));
+                self.widget_states.insert(w.id, (hint, state));
             }
         }
 
@@ -122,18 +121,32 @@ impl ClientApp {
 
         for (id, (hint, state)) in &self.widget_states {
             if let Some(bounds) = tree.get_widget_bounds(*id) {
-                repaints.push(RepaintCommand {
-                    widget_id: *id,
-                    bounds: *bounds,
-                    display_hint: hint.clone(),
-                    state: state.clone(),
-                });
+                repaints.push(Self::make_repaint(*id, *bounds, hint, state));
             }
         }
 
         repaints.sort_by_key(|r| r.widget_id);
         repaints
     }
+
+    fn make_repaint(
+        id: u16,
+        bounds: BoundingBox,
+        hint: &DisplayHint,
+        state: &WidgetState,
+    ) -> RepaintCommand {
+        RepaintCommand {
+            widget_id: id,
+            bounds,
+            display_hint: hint.clone(),
+            data: state
+                .data
+                .iter()
+                .map(|(k, v)| (k.clone(), v.clone()))
+                .collect(),
+            error: state.error.clone(),
+        }
+    }
 }
 
 fn wire_color(c: WireColor) -> Color {

crates/client-application/src/connection_loop.rs

@@ -0,0 +1,42 @@
+use client_domain::NetworkPort;
+use protocol::{ServerMessage, decode_server_message};
+use std::thread;
+use std::time::Duration;
+
+pub fn run_connection_loop<N: NetworkPort>(
+    net: &mut N,
+    server_addr: &str,
+    poll_interval: Duration,
+    reconnect_delay: Duration,
+    mut on_message: impl FnMut(ServerMessage),
+    mut on_connection_change: impl FnMut(bool),
+) {
+    loop {
+        if !net.is_connected() {
+            match net.connect(server_addr) {
+                Ok(()) => on_connection_change(true),
+                Err(_) => {
+                    on_connection_change(false);
+                    thread::sleep(reconnect_delay);
+                    continue;
+                }
+            }
+        }
+
+        match net.receive() {
+            Ok(Some(payload)) => {
+                if let Ok(msg) = decode_server_message(&payload) {
+                    on_message(msg);
+                }
+            }
+            Ok(None) => {
+                thread::sleep(poll_interval);
+            }
+            Err(_) => {
+                let _ = net.disconnect();
+                on_connection_change(false);
+                thread::sleep(reconnect_delay);
+            }
+        }
+    }
+}

crates/client-application/src/conversions.rs

@@ -0,0 +1,100 @@
+use domain::value_objects::{
+    AlignItems, ContainerNode, Direction, DisplayHint, DisplayHintKind, HAlign, JustifyContent,
+    LayoutChild, LayoutNode, Sizing, VAlign, Value, WidgetError, WidgetState,
+};
+use protocol::{
+    WireAlignItems, WireDirection, WireDisplayHint, WireDisplayHintKind, WireHAlign,
+    WireJustifyContent, WireLayoutNode, WireSizing, WireVAlign, WireValue, WireWidgetError,
+    WireWidgetState,
+};
+
+pub fn wire_to_value(w: WireValue) -> Value {
+    match w {
+        WireValue::Null => Value::Null,
+        WireValue::Bool(b) => Value::Bool(b),
+        WireValue::Number(n) => Value::Number(n),
+        WireValue::String(s) => Value::String(s),
+        WireValue::Array(arr) => Value::Array(arr.into_iter().map(wire_to_value).collect()),
+        WireValue::Object(map) => Value::Object(
+            map.into_iter()
+                .map(|(k, v)| (k, wire_to_value(v)))
+                .collect(),
+        ),
+    }
+}
+
+pub fn wire_to_widget_error(w: WireWidgetError) -> WidgetError {
+    match w {
+        WireWidgetError::SourceUnavailable => WidgetError::SourceUnavailable,
+        WireWidgetError::ExtractionFailed => WidgetError::ExtractionFailed,
+    }
+}
+
+pub fn wire_to_widget_state(w: WireWidgetState) -> WidgetState {
+    WidgetState {
+        data: w
+            .data
+            .into_iter()
+            .map(|kv| (kv.key, wire_to_value(kv.value)))
+            .collect(),
+        error: w.error.map(wire_to_widget_error),
+    }
+}
+
+pub fn wire_to_display_hint(w: WireDisplayHint) -> DisplayHint {
+    DisplayHint {
+        kind: match w.kind {
+            WireDisplayHintKind::IconValue => DisplayHintKind::IconValue,
+            WireDisplayHintKind::TextBlock => DisplayHintKind::TextBlock,
+            WireDisplayHintKind::KeyValue => DisplayHintKind::KeyValue,
+        },
+        h_align: match w.h_align {
+            WireHAlign::Left => HAlign::Left,
+            WireHAlign::Center => HAlign::Center,
+            WireHAlign::Right => HAlign::Right,
+        },
+        v_align: match w.v_align {
+            WireVAlign::Top => VAlign::Top,
+            WireVAlign::Middle => VAlign::Middle,
+            WireVAlign::Bottom => VAlign::Bottom,
+        },
+    }
+}
+
+pub fn wire_to_layout(w: WireLayoutNode) -> LayoutNode {
+    match w {
+        WireLayoutNode::Leaf(id) => LayoutNode::Leaf(id),
+        WireLayoutNode::Container(c) => LayoutNode::Container(ContainerNode {
+            direction: match c.direction {
+                WireDirection::Row => Direction::Row,
+                WireDirection::Column => Direction::Column,
+            },
+            gap: c.gap,
+            padding: c.padding,
+            justify_content: match c.justify_content {
+                WireJustifyContent::Start => JustifyContent::Start,
+                WireJustifyContent::Center => JustifyContent::Center,
+                WireJustifyContent::End => JustifyContent::End,
+                WireJustifyContent::SpaceBetween => JustifyContent::SpaceBetween,
+                WireJustifyContent::SpaceEvenly => JustifyContent::SpaceEvenly,
+            },
+            align_items: match c.align_items {
+                WireAlignItems::Start => AlignItems::Start,
+                WireAlignItems::Center => AlignItems::Center,
+                WireAlignItems::End => AlignItems::End,
+                WireAlignItems::Stretch => AlignItems::Stretch,
+            },
+            children: c
+                .children
+                .into_iter()
+                .map(|ch| LayoutChild {
+                    sizing: match ch.sizing {
+                        WireSizing::Fixed(px) => Sizing::Fixed(px),
+                        WireSizing::Flex(weight) => Sizing::Flex(weight),
+                    },
+                    node: wire_to_layout(ch.node),
+                })
+                .collect(),
+        }),
+    }
+}

crates/client-application/src/lib.rs

@@ -1,3 +1,6 @@
 mod client_app;
+mod connection_loop;
+pub mod conversions;
 
 pub use client_app::{ClientApp, RepaintCommand};
+pub use connection_loop::run_connection_loop;

crates/client-application/tests/client_app_tests.rs

@@ -1,4 +1,4 @@
-use client_application::{ClientApp, RepaintCommand};
+use client_application::ClientApp;
 use client_domain::BoundingBox;
 use protocol::{
     ServerMessage, WidgetDescriptor, WireAlignItems, WireContainerNode, WireDirection,
@@ -84,8 +84,8 @@ fn data_update_only_repaints_changed_widgets() {
     assert_eq!(repaints.len(), 1);
     assert_eq!(repaints[0].widget_id, 1);
     assert_eq!(
-        repaints[0].state.data[0].value,
-        WireValue::String("6.1°C".into())
+        repaints[0].data[0],
+        ("temperature".into(), domain::Value::String("6.1°C".into()))
     );
 }
 

crates/client-application/tests/conversion_tests.rs

@@ -0,0 +1,151 @@
+use client_application::conversions::{
+    wire_to_display_hint, wire_to_layout, wire_to_value, wire_to_widget_state,
+};
+use domain::{
+    AlignItems, ContainerNode, Direction, DisplayHint, DisplayHintKind, JustifyContent,
+    LayoutChild, LayoutNode, Sizing, Value, WidgetError, WidgetState,
+};
+use protocol::{
+    WireContainerNode, WireDirection, WireDisplayHint, WireKeyValue, WireLayoutChild,
+    WireLayoutNode, WireSizing, WireValue, WireWidgetError, WireWidgetState,
+};
+use std::collections::BTreeMap;
+
+fn value_to_wire(v: &Value) -> WireValue {
+    match v {
+        Value::Null => WireValue::Null,
+        Value::Bool(b) => WireValue::Bool(*b),
+        Value::Number(n) => WireValue::Number(*n),
+        Value::String(s) => WireValue::String(s.clone()),
+        Value::Array(arr) => WireValue::Array(arr.iter().map(value_to_wire).collect()),
+        Value::Object(map) => WireValue::Object(
+            map.iter()
+                .map(|(k, v)| (k.clone(), value_to_wire(v)))
+                .collect(),
+        ),
+    }
+}
+
+#[test]
+fn value_converts_to_wire_and_back() {
+    let original = Value::Object(BTreeMap::from([(
+        "items".into(),
+        Value::Array(vec![
+            Value::String("hello".into()),
+            Value::Number(42.0),
+            Value::Bool(true),
+            Value::Null,
+        ]),
+    )]));
+
+    let wire = value_to_wire(&original);
+    let roundtripped = wire_to_value(wire);
+    assert_eq!(original, roundtripped);
+}
+
+#[test]
+fn widget_state_with_error_converts_to_wire_and_back() {
+    let original = WidgetState {
+        data: BTreeMap::from([("temp".into(), Value::Number(5.4))]),
+        error: Some(WidgetError::SourceUnavailable),
+    };
+
+    let wire = WireWidgetState {
+        data: original
+            .data
+            .iter()
+            .map(|(k, v)| WireKeyValue {
+                key: k.clone(),
+                value: value_to_wire(v),
+            })
+            .collect(),
+        error: Some(WireWidgetError::SourceUnavailable),
+    };
+    let roundtripped = wire_to_widget_state(wire);
+    assert_eq!(original, roundtripped);
+}
+
+#[test]
+fn layout_tree_converts_to_wire_and_back() {
+    let original = LayoutNode::Container(ContainerNode {
+        direction: Direction::Row,
+        gap: 4,
+        padding: 2,
+        justify_content: JustifyContent::Start,
+        align_items: AlignItems::Stretch,
+        children: vec![
+            LayoutChild {
+                sizing: Sizing::Flex(1),
+                node: LayoutNode::Leaf(1),
+            },
+            LayoutChild {
+                sizing: Sizing::Fixed(100),
+                node: LayoutNode::Container(ContainerNode {
+                    direction: Direction::Column,
+                    gap: 2,
+                    padding: 0,
+                    justify_content: JustifyContent::Start,
+                    align_items: AlignItems::Stretch,
+                    children: vec![LayoutChild {
+                        sizing: Sizing::Flex(1),
+                        node: LayoutNode::Leaf(2),
+                    }],
+                }),
+            },
+        ],
+    });
+
+    let wire = WireLayoutNode::Container(WireContainerNode {
+        direction: WireDirection::Row,
+        gap: 4,
+        padding: 2,
+        justify_content: protocol::WireJustifyContent::Start,
+        align_items: protocol::WireAlignItems::Stretch,
+        children: vec![
+            WireLayoutChild {
+                sizing: WireSizing::Flex(1),
+                node: WireLayoutNode::Leaf(1),
+            },
+            WireLayoutChild {
+                sizing: WireSizing::Fixed(100),
+                node: WireLayoutNode::Container(WireContainerNode {
+                    direction: WireDirection::Column,
+                    gap: 2,
+                    padding: 0,
+                    justify_content: protocol::WireJustifyContent::Start,
+                    align_items: protocol::WireAlignItems::Stretch,
+                    children: vec![WireLayoutChild {
+                        sizing: WireSizing::Flex(1),
+                        node: WireLayoutNode::Leaf(2),
+                    }],
+                }),
+            },
+        ],
+    });
+
+    let roundtripped = wire_to_layout(wire);
+    assert_eq!(original, roundtripped);
+}
+
+#[test]
+fn display_hint_converts_to_wire_and_back() {
+    for (hint, wire_kind) in [
+        (
+            DisplayHintKind::IconValue,
+            protocol::WireDisplayHintKind::IconValue,
+        ),
+        (
+            DisplayHintKind::TextBlock,
+            protocol::WireDisplayHintKind::TextBlock,
+        ),
+        (
+            DisplayHintKind::KeyValue,
+            protocol::WireDisplayHintKind::KeyValue,
+        ),
+    ] {
+        let original = DisplayHint::new(hint);
+        let wire = WireDisplayHint::new(wire_kind);
+        let roundtripped = wire_to_display_hint(wire);
+        assert_eq!(original, roundtripped);
+    }
+}

crates/client-desktop/src/main.rs

@@ -1,14 +1,25 @@
-use client_application::ClientApp;
-use client_domain::NetworkPort;
-use client_domain::{BoundingBox, DisplayPort, FontMetrics, RenderEngine, ThemeConfig};
+use client_application::{ClientApp, RepaintCommand, run_connection_loop};
+use client_domain::{
+    BoundingBox, DisplayPort, FontMetrics, RenderEngine, RepaintRequest, ThemeConfig,
+    WidgetRenderer,
+};
 use display_terminal::TerminalDisplay;
-use domain::DisplayHint;
-use protocol::decode_server_message;
+use protocol::ServerMessage;
 use std::sync::mpsc;
 use std::thread;
-use std::time::Duration;
+use std::time::{Duration, Instant};
 use tcp_client::StdTcpClient;
 
+fn to_request(cmd: &RepaintCommand) -> RepaintRequest {
+    RepaintRequest {
+        widget_id: cmd.widget_id,
+        bounds: cmd.bounds,
+        display_hint: cmd.display_hint.clone(),
+        data: cmd.data.clone(),
+        error: cmd.error.clone(),
+    }
+}
+
 fn main() {
     let screen = BoundingBox::screen(240, 320);
     let mut app = ClientApp::new(screen);
@@ -18,52 +29,33 @@ fn main() {
         large: (10, 20),
     };
     let mut engine = RenderEngine::new(metrics, ThemeConfig::default());
+    let mut renderer = WidgetRenderer::new();
 
     println!("=== K-Frame Desktop Client ===");
     println!("Screen: {}x{}", screen.width, screen.height);
 
-    let (tx, rx) = mpsc::channel();
+    let (tx, rx) = mpsc::channel::<ServerMessage>();
 
     thread::spawn(move || {
-        let server_addr = "127.0.0.1:2699";
         let mut net = StdTcpClient::new();
-
-        loop {
-            if !net.is_connected() {
-                println!("[NET] Connecting to {server_addr}...");
-                match net.connect(server_addr) {
-                    Ok(()) => println!("[NET] Connected!"),
-                    Err(e) => {
-                        println!("[NET] Connection failed: {e}, retrying in 2s...");
-                        thread::sleep(Duration::from_secs(2));
-                        continue;
-                    }
-                }
-            }
-
-            match net.receive() {
-                Ok(Some(payload)) => match decode_server_message(&payload) {
-                    Ok(msg) => {
-                        let _ = tx.send(msg);
-                    }
-                    Err(e) => println!("[NET] Decode error: {e}"),
-                },
-                Ok(None) => {
-                    thread::sleep(Duration::from_millis(50));
-                }
-                Err(e) => {
-                    println!("[NET] Receive error: {e}, reconnecting...");
-                    let _ = net.disconnect();
-                    thread::sleep(Duration::from_secs(2));
-                }
-            }
-        }
+        let tx_clone = tx.clone();
+        run_connection_loop(
+            &mut net,
+            "127.0.0.1:2699",
+            Duration::from_millis(50),
+            Duration::from_secs(2),
+            move |msg| {
+                let _ = tx_clone.send(msg);
+            },
+            |_connected| {},
+        );
     });
 
     println!("[RENDER] Render loop started");
+    let mut last_tick = Instant::now();
 
     loop {
-        match rx.recv_timeout(Duration::from_millis(100)) {
+        match rx.recv_timeout(Duration::from_millis(50)) {
             Ok(msg) => {
                 let repaints = app.handle_message(msg);
 
@@ -73,20 +65,13 @@ fn main() {
 
                 if !repaints.is_empty() {
                     println!("\n--- Repaint ({} widgets) ---", repaints.len());
+
+                    let requests: Vec<_> = repaints.iter().map(to_request).collect();
                     let bg = engine.theme().background;
-                    for cmd in &repaints {
-                        display.fill_rect(cmd.bounds, bg).unwrap();
-
-                        let hint: DisplayHint = cmd.display_hint.clone().into();
-                        let data: Vec<(String, domain::Value)> = cmd
-                            .state
-                            .data
-                            .iter()
-                            .map(|kv| (kv.key.clone(), kv.value.clone().into()))
-                            .collect();
-
-                        let draw_cmds = engine.render_widget(&hint, &data, cmd.bounds, 0);
-                        for dc in &draw_cmds {
+                    let updates = renderer.apply_repaints(&engine, requests);
+                    for update in &updates {
+                        display.fill_rect(update.bounds, bg).unwrap();
+                        for dc in &update.commands {
                             display
                                 .draw_text_span(&dc.text, dc.x, dc.y, dc.color, dc.font)
                                 .unwrap();
@@ -98,5 +83,23 @@ fn main() {
             Err(mpsc::RecvTimeoutError::Timeout) => {}
             Err(mpsc::RecvTimeoutError::Disconnected) => break,
         }
+
+        let now = Instant::now();
+        let elapsed = now.duration_since(last_tick);
+        last_tick = now;
+
+        let scroll_updates = renderer.tick_scroll(&engine, elapsed);
+        if !scroll_updates.is_empty() {
+            let bg = engine.theme().background;
+            for update in &scroll_updates {
+                display.fill_rect(update.bounds, bg).unwrap();
+                for dc in &update.commands {
+                    display
+                        .draw_text_span(&dc.text, dc.x, dc.y, dc.color, dc.font)
+                        .unwrap();
+                }
+            }
+            display.flush().unwrap();
+        }
     }
 }

crates/client-domain/src/lib.rs

@@ -10,6 +10,7 @@ mod render_tree;
 mod scroll;
 mod text_layout;
 mod theme;
+mod widget_renderer;
 
 pub use alignment::align_offset;
 pub use bounding_box::BoundingBox;
@@ -18,9 +19,10 @@ pub use domain::{AlignItems, DisplayHintKind, HAlign, JustifyContent, VAlign};
 pub use font::{FontMetrics, FontSize};
 pub use layout_engine::LayoutEngine;
 pub use markup::{TextSpan, parse_markup};
-pub use ports::{ClientConfig, DisplayPort, NetworkPort, StoragePort};
+pub use ports::{DisplayPort, NetworkPort};
 pub use render_engine::{DrawCommand, RenderEngine};
 pub use render_tree::RenderTree;
 pub use scroll::ScrollState;
 pub use text_layout::wrap_lines;
 pub use theme::ThemeConfig;
+pub use widget_renderer::{RenderUpdate, RepaintRequest, WidgetRenderer};

crates/client-domain/src/ports/mod.rs

@@ -1,7 +1,5 @@
 mod display;
 mod network;
-mod storage;
 
 pub use display::DisplayPort;
 pub use network::NetworkPort;
-pub use storage::{ClientConfig, StoragePort};

crates/client-domain/src/ports/storage.rs

@@ -1,11 +0,0 @@
-pub struct ClientConfig {
-    pub wifi_ssid: String,
-    pub wifi_password: String,
-    pub server_addr: String,
-}
-
-pub trait StoragePort {
-    type Error;
-
-    fn load_config(&self) -> Result<ClientConfig, Self::Error>;
-}

crates/client-domain/src/render_engine.rs

@@ -2,7 +2,7 @@ use crate::{
     BoundingBox, Color, FontMetrics, FontSize, ThemeConfig, alignment::align_offset,
     markup::parse_markup, text_layout::wrap_lines,
 };
-use domain::{DisplayHint, DisplayHintKind, HAlign, VAlign, Value};
+use domain::{DisplayHint, DisplayHintKind, HAlign, VAlign, Value, WidgetError};
 
 #[derive(Debug, Clone, PartialEq)]
 pub struct DrawCommand {
@@ -92,26 +92,38 @@ impl RenderEngine {
         data: &[(String, Value)],
         bounds: BoundingBox,
         scroll_offset: u16,
+        error: Option<&WidgetError>,
     ) -> Vec<DrawCommand> {
-        let text = self.format_widget(hint, data);
+        let mut text = self.format_widget(hint, data);
+        if error.is_some() {
+            text = format!("{{accent}}[offline]{{/}}\n{text}");
+        }
         let mut cmds = self.render_text(&text, bounds, hint.h_align, hint.v_align);
 
         if scroll_offset > 0 {
             for cmd in &mut cmds {
                 cmd.y = cmd.y.saturating_sub(scroll_offset);
             }
-            // Drop commands that scrolled above bounds
-            cmds.retain(|cmd| {
-                cmd.y + self.metrics.char_height(cmd.font) > bounds.y
-                    && cmd.y < bounds.y + bounds.height
-            });
         }
+        cmds.retain(|cmd| {
+            let line_h = self.metrics.char_height(cmd.font);
+            cmd.y >= bounds.y && cmd.y + line_h <= bounds.y + bounds.height
+        });
 
         cmds
     }
 
-    pub fn content_height(&self, hint: &DisplayHint, data: &[(String, Value)], width: u16) -> u16 {
-        let text = self.format_widget(hint, data);
+    pub fn content_height(
+        &self,
+        hint: &DisplayHint,
+        data: &[(String, Value)],
+        width: u16,
+        error: Option<&WidgetError>,
+    ) -> u16 {
+        let mut text = self.format_widget(hint, data);
+        if error.is_some() {
+            text = format!("{{accent}}[offline]{{/}}\n{text}");
+        }
         let plain: String = parse_markup(&text, &self.theme)
             .iter()
             .map(|s| s.text.as_str())

crates/client-domain/src/scroll.rs

@@ -1,7 +1,7 @@
 use std::time::Duration;
 
-const PAUSE_DURATION: Duration = Duration::from_secs(2);
-const SCROLL_SPEED_PX_PER_SEC: f32 = 30.0;
+const PAUSE_DURATION: Duration = Duration::from_secs(3);
+const SCROLL_SPEED_PX_PER_SEC: f32 = 15.0;
 
 #[derive(Debug)]
 pub struct ScrollState {

crates/client-domain/src/widget_renderer.rs

@@ -0,0 +1,113 @@
+use crate::{BoundingBox, DrawCommand, RenderEngine, ScrollState};
+use domain::{DisplayHint, Value, WidgetError};
+use std::collections::HashMap;
+use std::time::Duration;
+
+pub struct RenderUpdate {
+    pub bounds: BoundingBox,
+    pub commands: Vec<DrawCommand>,
+}
+
+struct WidgetCache {
+    hint: DisplayHint,
+    data: Vec<(String, Value)>,
+    error: Option<WidgetError>,
+    bounds: BoundingBox,
+    scroll: ScrollState,
+}
+
+pub struct RepaintRequest {
+    pub widget_id: u16,
+    pub bounds: BoundingBox,
+    pub display_hint: DisplayHint,
+    pub data: Vec<(String, Value)>,
+    pub error: Option<WidgetError>,
+}
+
+pub struct WidgetRenderer {
+    widgets: HashMap<u16, WidgetCache>,
+}
+
+impl Default for WidgetRenderer {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl WidgetRenderer {
+    pub fn new() -> Self {
+        Self {
+            widgets: HashMap::new(),
+        }
+    }
+
+    pub fn apply_repaints(
+        &mut self,
+        engine: &RenderEngine,
+        repaints: Vec<RepaintRequest>,
+    ) -> Vec<RenderUpdate> {
+        let mut updates = Vec::new();
+        for req in repaints {
+            let content_h = engine.content_height(
+                &req.display_hint,
+                &req.data,
+                req.bounds.width,
+                req.error.as_ref(),
+            );
+            let scroll = ScrollState::new(req.bounds.height, content_h);
+
+            let cmds = engine.render_widget(
+                &req.display_hint,
+                &req.data,
+                req.bounds,
+                scroll.offset(),
+                req.error.as_ref(),
+            );
+
+            updates.push(RenderUpdate {
+                bounds: req.bounds,
+                commands: cmds,
+            });
+
+            self.widgets.insert(
+                req.widget_id,
+                WidgetCache {
+                    hint: req.display_hint,
+                    data: req.data,
+                    error: req.error,
+                    bounds: req.bounds,
+                    scroll,
+                },
+            );
+        }
+        updates
+    }
+
+    pub fn tick_scroll(&mut self, engine: &RenderEngine, elapsed: Duration) -> Vec<RenderUpdate> {
+        let mut updates = Vec::new();
+        for cache in self.widgets.values_mut() {
+            if cache.scroll.tick(elapsed) {
+                let cmds = engine.render_widget(
+                    &cache.hint,
+                    &cache.data,
+                    cache.bounds,
+                    cache.scroll.offset(),
+                    cache.error.as_ref(),
+                );
+                updates.push(RenderUpdate {
+                    bounds: cache.bounds,
+                    commands: cmds,
+                });
+            }
+        }
+        updates
+    }
+
+    pub fn has_active_scrollers(&self) -> bool {
+        self.widgets.values().any(|c| c.scroll.is_active())
+    }
+
+    pub fn clear(&mut self) {
+        self.widgets.clear();
+    }
+}

crates/client-esp32/Cargo.lock

@@ -238,17 +238,13 @@ dependencies = [
  "client-domain",
  "domain",
  "embedded-graphics",
- "embedded-hal-bus",
- "embedded-text",
  "embuild",
  "esp-idf-hal",
  "esp-idf-svc",
  "esp-idf-sys",
  "log",
  "mipidsi",
- "postcard",
  "protocol",
- "serde",
 ]
 
 [[package]]
@@ -489,16 +485,6 @@ dependencies = [
  "embedded-hal 1.0.0",
 ]
 
-[[package]]
-name = "embedded-hal-bus"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "513e0b3a8fb7d3013a8ae17a834283f170deaf7d0eeab0a7c1a36ad4dd356d22"
-dependencies = [
- "critical-section",
- "embedded-hal 1.0.0",
-]
-
 [[package]]
 name = "embedded-hal-nb"
 version = "1.0.0"
@@ -561,17 +547,6 @@ dependencies = [
  "strum 0.27.2",
 ]
 
-[[package]]
-name = "embedded-text"
-version = "0.7.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6cf5c72c52db2f7dbe4a9c1ed81cd21301e8d66311b194fa41c04fb4f71843ba"
-dependencies = [
- "az",
- "embedded-graphics",
- "object-chain",
-]
-
 [[package]]
 name = "embuild"
 version = "0.33.1"
@@ -1126,12 +1101,6 @@ dependencies = [
  "syn 2.0.118",
 ]
 
-[[package]]
-name = "object-chain"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41af26158b0f5530f7b79955006c2727cd23d0d8e7c3109dc316db0a919784dd"
-
 [[package]]
 name = "once_cell"
 version = "1.21.4"

crates/client-esp32/Cargo.toml

@@ -15,16 +15,18 @@ esp-idf-sys = "0.37"
 
 mipidsi = "0.10"
 embedded-graphics = "0.8"
-embedded-text = "0.7"
-embedded-hal-bus = "0.3"
-
-serde = { version = "1.0", default-features = false, features = [
-    "derive",
-    "alloc",
-] }
-postcard = { version = "1.1", default-features = false, features = ["alloc"] }
 
 log = "0.4"
 
+[profile.release]
+opt-level = "s"
+lto = true
+strip = true
+panic = "abort"
+codegen-units = 1
+
+[profile.dev]
+panic = "abort"
+
 [build-dependencies]
 embuild = "0.33"

crates/client-esp32/sdkconfig.defaults

@@ -19,3 +19,13 @@ CONFIG_PARTITION_TABLE_SINGLE_APP_LARGE=y
 CONFIG_ESP_TASK_WDT_TIMEOUT_S=30
 CONFIG_ESP_TASK_WDT_CHECK_IDLE_TASK_CPU0=n
 CONFIG_ESP_TASK_WDT_CHECK_IDLE_TASK_CPU1=n
+
+# Disable Bluetooth (unused)
+CONFIG_BT_ENABLED=n
+
+# Disable ESP-MESH (unused)
+CONFIG_ESP_WIFI_MESH_SUPPORT=n
+
+# Reduce log verbosity
+CONFIG_LOG_DEFAULT_LEVEL_INFO=y
+CONFIG_LOG_MAXIMUM_LEVEL_INFO=y

crates/client-esp32/src/boot/logo.rs

@@ -41,12 +41,6 @@ fn fill_triangles<D: DrawTarget<Color = Rgb565>>(
     }
 }
 
-// Outer hexagon vertices (150x150 viewBox)
-const OUTER_HEX: [(f32, f32); 6] = [
-    (75.0, 0.0), (150.0, 37.5), (150.0, 112.5),
-    (75.0, 150.0), (0.0, 112.5), (0.0, 37.5),
-];
-
 // Converted from SVG: (150,75)(112.5,150)(37.5,150)(0,75)(37.5,0)(112.5,0)
 // Reordered to start from top for cleaner fan
 const OUTER_HEX_SVG: [(f32, f32); 6] = [

crates/client-esp32/src/tasks/network.rs

@@ -1,56 +1,26 @@
 use std::sync::mpsc;
 use std::thread;
-use client_domain::NetworkPort;
-use protocol::decode_server_message;
+use client_application::run_connection_loop;
 use super::RenderEvent;
 use crate::config::{NET_THREAD_STACK_SIZE, NET_POLL_INTERVAL, NET_RECONNECT_DELAY};
 use crate::adapters::network::Esp32Network;
-use log::*;
 
 pub fn spawn(server_addr: String, tx: mpsc::Sender<RenderEvent>) {
     thread::Builder::new()
         .stack_size(NET_THREAD_STACK_SIZE)
         .name("net".into())
-        .spawn(move || run(server_addr, tx))
+        .spawn(move || {
+            let mut net = Esp32Network::new();
+            let tx_msg = tx.clone();
+            let tx_status = tx.clone();
+            run_connection_loop(
+                &mut net,
+                &server_addr,
+                NET_POLL_INTERVAL,
+                NET_RECONNECT_DELAY,
+                move |msg| { let _ = tx_msg.send(RenderEvent::Server(msg)); },
+                move |connected| { let _ = tx_status.send(RenderEvent::ConnectionStatus(connected)); },
+            );
+        })
         .expect("failed to spawn network thread");
 }
-
-fn run(server_addr: String, tx: mpsc::Sender<RenderEvent>) {
-    let mut net = Esp32Network::new();
-
-    loop {
-        if !net.is_connected() {
-            info!("Connecting to server {server_addr}...");
-            match net.connect(&server_addr) {
-                Ok(()) => {
-                    info!("Server connected");
-                    let _ = tx.send(RenderEvent::ConnectionStatus(true));
-                }
-                Err(e) => {
-                    error!("Connection failed: {e}, retrying...");
-                    let _ = tx.send(RenderEvent::ConnectionStatus(false));
-                    thread::sleep(NET_RECONNECT_DELAY);
-                    continue;
-                }
-            }
-        }
-
-        match net.receive() {
-            Ok(Some(payload)) => {
-                match decode_server_message(&payload) {
-                    Ok(msg) => { let _ = tx.send(RenderEvent::Server(msg)); }
-                    Err(e) => error!("Decode error: {e}"),
-                }
-            }
-            Ok(None) => {
-                thread::sleep(NET_POLL_INTERVAL);
-            }
-            Err(e) => {
-                error!("Receive error: {e}, reconnecting...");
-                let _ = net.disconnect();
-                let _ = tx.send(RenderEvent::ConnectionStatus(false));
-                thread::sleep(NET_RECONNECT_DELAY);
-            }
-        }
-    }
-}

crates/client-esp32/src/tasks/render.rs

@@ -1,11 +1,12 @@
 use std::sync::mpsc;
 use std::time::{Duration, Instant};
-use std::collections::HashMap;
+
+use client_application::RepaintCommand;
 use client_domain::{
-    BoundingBox, Color, DisplayPort, FontMetrics, RenderEngine, ScrollState, ThemeConfig,
+    BoundingBox, Color, DisplayPort, FontMetrics, RenderEngine, RepaintRequest, ThemeConfig,
+    WidgetRenderer,
 };
-use client_application::{ClientApp, RepaintCommand};
-use domain::{DisplayHint, Value};
+use client_application::ClientApp;
 use protocol::ServerMessage;
 use super::RenderEvent;
 use crate::config::RENDER_POLL_INTERVAL;
@@ -18,11 +19,14 @@ const INDICATOR_MARGIN: u16 = 4;
 const COLOR_CONNECTED: Color = Color(0, 200, 0);
 const COLOR_DISCONNECTED: Color = Color(200, 0, 0);
 
-struct WidgetCache {
-    hint: DisplayHint,
-    data: Vec<(String, Value)>,
-    bounds: BoundingBox,
-    scroll: ScrollState,
+fn to_request(cmd: &RepaintCommand) -> RepaintRequest {
+    RepaintRequest {
+        widget_id: cmd.widget_id,
+        bounds: cmd.bounds,
+        display_hint: cmd.display_hint.clone(),
+        data: cmd.data.clone(),
+        error: cmd.error.clone(),
+    }
 }
 
 pub fn run(
@@ -36,7 +40,7 @@ pub fn run(
     };
     let mut engine = RenderEngine::new(metrics, ThemeConfig::default());
     let mut app = ClientApp::new(screen);
-    let mut widgets: HashMap<u16, WidgetCache> = HashMap::new();
+    let mut renderer = WidgetRenderer::new();
     let mut first_update = true;
     let mut last_tick = Instant::now();
     let mut connected = false;
@@ -46,7 +50,12 @@ pub fn run(
     display.flush().unwrap();
 
     loop {
-        let timeout = RENDER_POLL_INTERVAL.min(SCROLL_TICK);
+        let has_scrollers = renderer.has_active_scrollers();
+        let timeout = if has_scrollers {
+            SCROLL_TICK
+        } else {
+            RENDER_POLL_INTERVAL
+        };
         match rx.recv_timeout(timeout) {
             Ok(RenderEvent::ConnectionStatus(status)) => {
                 if status != connected {
@@ -69,14 +78,19 @@ pub fn run(
                     display.fill_rect(screen, bg).unwrap();
                     first_update = false;
                 }
-                for cmd in &repaints {
-                    let cache = update_cache(&engine, cmd);
-                    display.fill_rect(cache.bounds, bg).unwrap();
-                    draw_widget(&engine, &mut display, &cache);
-                    widgets.insert(cmd.widget_id, cache);
+
+                let requests: Vec<_> = repaints.iter().map(to_request).collect();
+                let updates = renderer.apply_repaints(&engine, requests);
+                for update in &updates {
+                    display.fill_rect(update.bounds, bg).unwrap();
+                    for dc in &update.commands {
+                        display
+                            .draw_text_span(&dc.text, dc.x, dc.y, dc.color, dc.font)
+                            .unwrap();
+                    }
                 }
 
-                if !repaints.is_empty() {
+                if !updates.is_empty() {
                     draw_indicator(&mut display, screen, connected);
                     display.flush().unwrap();
                 }
@@ -92,16 +106,17 @@ pub fn run(
         let elapsed = now.duration_since(last_tick);
         last_tick = now;
 
-        let mut needs_flush = false;
-        for cache in widgets.values_mut() {
-            if cache.scroll.tick(elapsed) {
-                let bg = engine.theme().background;
-                display.fill_rect(cache.bounds, bg).unwrap();
-                draw_widget(&engine, &mut display, cache);
-                needs_flush = true;
+        let scroll_updates = renderer.tick_scroll(&engine, elapsed);
+        if !scroll_updates.is_empty() {
+            let bg = engine.theme().background;
+            for update in &scroll_updates {
+                display.fill_rect(update.bounds, bg).unwrap();
+                for dc in &update.commands {
+                    display
+                        .draw_text_span(&dc.text, dc.x, dc.y, dc.color, dc.font)
+                        .unwrap();
+                }
             }
-        }
-        if needs_flush {
             draw_indicator(&mut display, screen, connected);
             display.flush().unwrap();
         }
@@ -109,43 +124,14 @@ pub fn run(
 }
 
 fn draw_indicator(display: &mut Esp32DisplayAdapter, screen: BoundingBox, connected: bool) {
-    let color = if connected { COLOR_CONNECTED } else { COLOR_DISCONNECTED };
+    let color = if connected {
+        COLOR_CONNECTED
+    } else {
+        COLOR_DISCONNECTED
+    };
     let x = screen.x + screen.width - INDICATOR_DIAMETER - INDICATOR_MARGIN;
     let y = screen.y + screen.height - INDICATOR_DIAMETER - INDICATOR_MARGIN;
-    display.fill_circle(x, y, INDICATOR_DIAMETER, color).unwrap();
-}
-
-fn update_cache(engine: &RenderEngine, cmd: &RepaintCommand) -> WidgetCache {
-    let hint: DisplayHint = cmd.display_hint.clone().into();
-    let data: Vec<(String, Value)> = cmd.state.data
-        .iter()
-        .map(|kv| (kv.key.clone(), kv.value.clone().into()))
-        .collect();
-
-    let content_h = engine.content_height(&hint, &data, cmd.bounds.width);
-    let scroll = ScrollState::new(cmd.bounds.height, content_h);
-
-    WidgetCache {
-        hint,
-        data,
-        bounds: cmd.bounds,
-        scroll,
-    }
-}
-
-fn draw_widget(
-    engine: &RenderEngine,
-    display: &mut Esp32DisplayAdapter,
-    cache: &WidgetCache,
-) {
-    let draw_cmds = engine.render_widget(
-        &cache.hint,
-        &cache.data,
-        cache.bounds,
-        cache.scroll.offset(),
-    );
-
-    for dc in &draw_cmds {
-        display.draw_text_span(&dc.text, dc.x, dc.y, dc.color, dc.font).unwrap();
-    }
+    display
+        .fill_circle(x, y, INDICATOR_DIAMETER, color)
+        .unwrap();
 }

crates/domain/Cargo.toml

@@ -3,6 +3,10 @@ name = "domain"
 version = "0.1.0"
 edition = "2024"
 
+[features]
+json = ["serde_json"]
+
 [dependencies]
+serde_json = { workspace = true, optional = true }
 
 [dev-dependencies]

crates/domain/src/lib.rs

@@ -12,7 +12,8 @@ pub use entities::{
 pub use events::DomainEvent;
 pub use ports::{
     AuthPort, BroadcastPort, ClientRegistry, ConfigRepository, ConnectedClient, DataSourcePort,
-    EventPublisher, PasswordHashPort, SecretStore, WidgetStateReader,
+    EventPublisher, PasswordHashPort, SecretStore, UserRepository, WidgetStateCache,
+    WidgetStateReader,
 };
 pub use value_objects::{
     AlignItems, ContainerNode, Direction, DisplayHint, DisplayHintKind, HAlign, JustifyContent,

crates/domain/src/ports/config_repository.rs

@@ -1,5 +1,5 @@
 use crate::entities::{
-    DataSource, DataSourceId, LayoutPreset, LayoutPresetId, User, WidgetConfig, WidgetId,
+    DataSource, DataSourceId, LayoutPreset, LayoutPresetId, WidgetConfig, WidgetId,
 };
 use crate::value_objects::{Layout, ThemeConfig};
 use std::future::Future;
@@ -56,11 +56,4 @@ pub trait ConfigRepository {
         &self,
         theme: &ThemeConfig,
     ) -> impl Future<Output = Result<(), Self::Error>> + Send;
-
-    fn get_user_by_username(
-        &self,
-        username: &str,
-    ) -> impl Future<Output = Result<Option<User>, Self::Error>> + Send;
-    fn save_user(&self, user: &User) -> impl Future<Output = Result<(), Self::Error>> + Send;
-    fn count_users(&self) -> impl Future<Output = Result<u32, Self::Error>> + Send;
 }

crates/domain/src/ports/mod.rs

@@ -5,6 +5,8 @@ mod config_repository;
 mod data_source_port;
 mod event;
 mod secret_store;
+mod user_repository;
+mod widget_state_cache;
 mod widget_state_reader;
 
 pub use auth::{AuthPort, PasswordHashPort};
@@ -14,4 +16,6 @@ pub use config_repository::ConfigRepository;
 pub use data_source_port::DataSourcePort;
 pub use event::EventPublisher;
 pub use secret_store::SecretStore;
+pub use user_repository::UserRepository;
+pub use widget_state_cache::WidgetStateCache;
 pub use widget_state_reader::WidgetStateReader;

crates/domain/src/ports/user_repository.rs

@@ -0,0 +1,13 @@
+use crate::entities::User;
+use std::future::Future;
+
+pub trait UserRepository {
+    type Error;
+
+    fn get_user_by_username(
+        &self,
+        username: &str,
+    ) -> impl Future<Output = Result<Option<User>, Self::Error>> + Send;
+    fn save_user(&self, user: &User) -> impl Future<Output = Result<(), Self::Error>> + Send;
+    fn count_users(&self) -> impl Future<Output = Result<u32, Self::Error>> + Send;
+}

crates/domain/src/ports/widget_state_cache.rs

@@ -0,0 +1,15 @@
+use crate::entities::WidgetId;
+use crate::value_objects::WidgetState;
+use std::future::Future;
+
+pub trait WidgetStateCache {
+    type Error;
+
+    fn save_widget_states(
+        &self,
+        states: &[(WidgetId, WidgetState)],
+    ) -> impl Future<Output = Result<(), Self::Error>> + Send;
+    fn load_widget_states(
+        &self,
+    ) -> impl Future<Output = Result<Vec<(WidgetId, WidgetState)>, Self::Error>> + Send;
+}

crates/domain/src/value_objects/value.rs

@@ -1,5 +1,39 @@
 use std::collections::BTreeMap;
 
+#[cfg(feature = "json")]
+impl From<serde_json::Value> for Value {
+    fn from(json: serde_json::Value) -> Self {
+        match json {
+            serde_json::Value::Null => Value::Null,
+            serde_json::Value::Bool(b) => Value::Bool(b),
+            serde_json::Value::Number(n) => Value::Number(n.as_f64().unwrap_or(0.0)),
+            serde_json::Value::String(s) => Value::String(s),
+            serde_json::Value::Array(arr) => {
+                Value::Array(arr.into_iter().map(Into::into).collect())
+            }
+            serde_json::Value::Object(map) => {
+                Value::Object(map.into_iter().map(|(k, v)| (k, v.into())).collect())
+            }
+        }
+    }
+}
+
+#[cfg(feature = "json")]
+impl From<&Value> for serde_json::Value {
+    fn from(v: &Value) -> Self {
+        match v {
+            Value::Null => serde_json::Value::Null,
+            Value::Bool(b) => serde_json::Value::Bool(*b),
+            Value::Number(n) => serde_json::json!(*n),
+            Value::String(s) => serde_json::Value::String(s.clone()),
+            Value::Array(arr) => serde_json::Value::Array(arr.iter().map(Into::into).collect()),
+            Value::Object(map) => {
+                serde_json::Value::Object(map.iter().map(|(k, v)| (k.clone(), v.into())).collect())
+            }
+        }
+    }
+}
+
 #[derive(Debug, Clone, PartialEq)]
 pub enum Value {
     Null,

crates/protocol/Cargo.toml

@@ -4,7 +4,6 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-domain.workspace = true
 serde.workspace = true
 postcard.workspace = true
 

crates/protocol/src/wire.rs

@@ -1,7 +1,3 @@
-use domain::value_objects::{
-    AlignItems, ContainerNode, Direction, DisplayHint, DisplayHintKind, HAlign, JustifyContent,
-    LayoutChild, LayoutNode, Sizing, VAlign, Value, WidgetError, WidgetState,
-};
 use serde::{Deserialize, Serialize};
 use std::collections::BTreeMap;
 
@@ -15,60 +11,12 @@ pub enum WireValue {
     Object(BTreeMap<String, WireValue>),
 }
 
-impl From<&Value> for WireValue {
-    fn from(v: &Value) -> Self {
-        match v {
-            Value::Null => WireValue::Null,
-            Value::Bool(b) => WireValue::Bool(*b),
-            Value::Number(n) => WireValue::Number(*n),
-            Value::String(s) => WireValue::String(s.clone()),
-            Value::Array(arr) => WireValue::Array(arr.iter().map(Into::into).collect()),
-            Value::Object(map) => {
-                WireValue::Object(map.iter().map(|(k, v)| (k.clone(), v.into())).collect())
-            }
-        }
-    }
-}
-
-impl From<WireValue> for Value {
-    fn from(w: WireValue) -> Self {
-        match w {
-            WireValue::Null => Value::Null,
-            WireValue::Bool(b) => Value::Bool(b),
-            WireValue::Number(n) => Value::Number(n),
-            WireValue::String(s) => Value::String(s),
-            WireValue::Array(arr) => Value::Array(arr.into_iter().map(Into::into).collect()),
-            WireValue::Object(map) => {
-                Value::Object(map.into_iter().map(|(k, v)| (k, v.into())).collect())
-            }
-        }
-    }
-}
-
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub enum WireWidgetError {
     SourceUnavailable,
     ExtractionFailed,
 }
 
-impl From<&WidgetError> for WireWidgetError {
-    fn from(e: &WidgetError) -> Self {
-        match e {
-            WidgetError::SourceUnavailable => WireWidgetError::SourceUnavailable,
-            WidgetError::ExtractionFailed => WireWidgetError::ExtractionFailed,
-        }
-    }
-}
-
-impl From<WireWidgetError> for WidgetError {
-    fn from(w: WireWidgetError) -> Self {
-        match w {
-            WireWidgetError::SourceUnavailable => WidgetError::SourceUnavailable,
-            WireWidgetError::ExtractionFailed => WidgetError::ExtractionFailed,
-        }
-    }
-}
-
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub struct WireKeyValue {
     pub key: String,
@@ -81,35 +29,6 @@ pub struct WireWidgetState {
     pub error: Option<WireWidgetError>,
 }
 
-impl From<&WidgetState> for WireWidgetState {
-    fn from(s: &WidgetState) -> Self {
-        WireWidgetState {
-            data: s
-                .data
-                .iter()
-                .map(|(k, v)| WireKeyValue {
-                    key: k.clone(),
-                    value: v.into(),
-                })
-                .collect(),
-            error: s.error.as_ref().map(Into::into),
-        }
-    }
-}
-
-impl From<WireWidgetState> for WidgetState {
-    fn from(w: WireWidgetState) -> Self {
-        WidgetState {
-            data: w
-                .data
-                .into_iter()
-                .map(|kv| (kv.key, kv.value.into()))
-                .collect(),
-            error: w.error.map(Into::into),
-        }
-    }
-}
-
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub enum WireDisplayHintKind {
     IconValue,
@@ -148,134 +67,18 @@ impl WireDisplayHint {
     }
 }
 
-impl From<&DisplayHintKind> for WireDisplayHintKind {
-    fn from(k: &DisplayHintKind) -> Self {
-        match k {
-            DisplayHintKind::IconValue => WireDisplayHintKind::IconValue,
-            DisplayHintKind::TextBlock => WireDisplayHintKind::TextBlock,
-            DisplayHintKind::KeyValue => WireDisplayHintKind::KeyValue,
-        }
-    }
-}
-
-impl From<WireDisplayHintKind> for DisplayHintKind {
-    fn from(w: WireDisplayHintKind) -> Self {
-        match w {
-            WireDisplayHintKind::IconValue => DisplayHintKind::IconValue,
-            WireDisplayHintKind::TextBlock => DisplayHintKind::TextBlock,
-            WireDisplayHintKind::KeyValue => DisplayHintKind::KeyValue,
-        }
-    }
-}
-
-impl From<&HAlign> for WireHAlign {
-    fn from(h: &HAlign) -> Self {
-        match h {
-            HAlign::Left => WireHAlign::Left,
-            HAlign::Center => WireHAlign::Center,
-            HAlign::Right => WireHAlign::Right,
-        }
-    }
-}
-
-impl From<WireHAlign> for HAlign {
-    fn from(w: WireHAlign) -> Self {
-        match w {
-            WireHAlign::Left => HAlign::Left,
-            WireHAlign::Center => HAlign::Center,
-            WireHAlign::Right => HAlign::Right,
-        }
-    }
-}
-
-impl From<&VAlign> for WireVAlign {
-    fn from(v: &VAlign) -> Self {
-        match v {
-            VAlign::Top => WireVAlign::Top,
-            VAlign::Middle => WireVAlign::Middle,
-            VAlign::Bottom => WireVAlign::Bottom,
-        }
-    }
-}
-
-impl From<WireVAlign> for VAlign {
-    fn from(w: WireVAlign) -> Self {
-        match w {
-            WireVAlign::Top => VAlign::Top,
-            WireVAlign::Middle => VAlign::Middle,
-            WireVAlign::Bottom => VAlign::Bottom,
-        }
-    }
-}
-
-impl From<&DisplayHint> for WireDisplayHint {
-    fn from(h: &DisplayHint) -> Self {
-        WireDisplayHint {
-            kind: (&h.kind).into(),
-            h_align: (&h.h_align).into(),
-            v_align: (&h.v_align).into(),
-        }
-    }
-}
-
-impl From<WireDisplayHint> for DisplayHint {
-    fn from(w: WireDisplayHint) -> Self {
-        DisplayHint {
-            kind: w.kind.into(),
-            h_align: w.h_align.into(),
-            v_align: w.v_align.into(),
-        }
-    }
-}
-
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub enum WireSizing {
     Fixed(u16),
     Flex(u8),
 }
 
-impl From<&Sizing> for WireSizing {
-    fn from(s: &Sizing) -> Self {
-        match s {
-            Sizing::Fixed(px) => WireSizing::Fixed(*px),
-            Sizing::Flex(w) => WireSizing::Flex(*w),
-        }
-    }
-}
-
-impl From<WireSizing> for Sizing {
-    fn from(w: WireSizing) -> Self {
-        match w {
-            WireSizing::Fixed(px) => Sizing::Fixed(px),
-            WireSizing::Flex(weight) => Sizing::Flex(weight),
-        }
-    }
-}
-
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub enum WireDirection {
     Row,
     Column,
 }
 
-impl From<&Direction> for WireDirection {
-    fn from(d: &Direction) -> Self {
-        match d {
-            Direction::Row => WireDirection::Row,
-            Direction::Column => WireDirection::Column,
-        }
-    }
-}
-
-impl From<WireDirection> for Direction {
-    fn from(w: WireDirection) -> Self {
-        match w {
-            WireDirection::Row => Direction::Row,
-            WireDirection::Column => Direction::Column,
-        }
-    }
-}
-
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub enum WireJustifyContent {
     Start,
@@ -285,30 +88,6 @@ pub enum WireJustifyContent {
     SpaceEvenly,
 }
 
-impl From<&JustifyContent> for WireJustifyContent {
-    fn from(j: &JustifyContent) -> Self {
-        match j {
-            JustifyContent::Start => WireJustifyContent::Start,
-            JustifyContent::Center => WireJustifyContent::Center,
-            JustifyContent::End => WireJustifyContent::End,
-            JustifyContent::SpaceBetween => WireJustifyContent::SpaceBetween,
-            JustifyContent::SpaceEvenly => WireJustifyContent::SpaceEvenly,
-        }
-    }
-}
-
-impl From<WireJustifyContent> for JustifyContent {
-    fn from(w: WireJustifyContent) -> Self {
-        match w {
-            WireJustifyContent::Start => JustifyContent::Start,
-            WireJustifyContent::Center => JustifyContent::Center,
-            WireJustifyContent::End => JustifyContent::End,
-            WireJustifyContent::SpaceBetween => JustifyContent::SpaceBetween,
-            WireJustifyContent::SpaceEvenly => JustifyContent::SpaceEvenly,
-        }
-    }
-}
-
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub enum WireAlignItems {
     Start,
@@ -317,28 +96,6 @@ pub enum WireAlignItems {
     Stretch,
 }
 
-impl From<&AlignItems> for WireAlignItems {
-    fn from(a: &AlignItems) -> Self {
-        match a {
-            AlignItems::Start => WireAlignItems::Start,
-            AlignItems::Center => WireAlignItems::Center,
-            AlignItems::End => WireAlignItems::End,
-            AlignItems::Stretch => WireAlignItems::Stretch,
-        }
-    }
-}
-
-impl From<WireAlignItems> for AlignItems {
-    fn from(w: WireAlignItems) -> Self {
-        match w {
-            WireAlignItems::Start => AlignItems::Start,
-            WireAlignItems::Center => AlignItems::Center,
-            WireAlignItems::End => AlignItems::End,
-            WireAlignItems::Stretch => AlignItems::Stretch,
-        }
-    }
-}
-
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub struct WireContainerNode {
     pub direction: WireDirection,
@@ -360,49 +117,3 @@ pub enum WireLayoutNode {
     Container(WireContainerNode),
     Leaf(u16),
 }
-
-impl From<&LayoutNode> for WireLayoutNode {
-    fn from(n: &LayoutNode) -> Self {
-        match n {
-            LayoutNode::Leaf(id) => WireLayoutNode::Leaf(*id),
-            LayoutNode::Container(c) => WireLayoutNode::Container(WireContainerNode {
-                direction: (&c.direction).into(),
-                gap: c.gap,
-                padding: c.padding,
-                justify_content: (&c.justify_content).into(),
-                align_items: (&c.align_items).into(),
-                children: c
-                    .children
-                    .iter()
-                    .map(|ch| WireLayoutChild {
-                        sizing: (&ch.sizing).into(),
-                        node: (&ch.node).into(),
-                    })
-                    .collect(),
-            }),
-        }
-    }
-}
-
-impl From<WireLayoutNode> for LayoutNode {
-    fn from(w: WireLayoutNode) -> Self {
-        match w {
-            WireLayoutNode::Leaf(id) => LayoutNode::Leaf(id),
-            WireLayoutNode::Container(c) => LayoutNode::Container(ContainerNode {
-                direction: c.direction.into(),
-                gap: c.gap,
-                padding: c.padding,
-                justify_content: c.justify_content.into(),
-                align_items: c.align_items.into(),
-                children: c
-                    .children
-                    .into_iter()
-                    .map(|ch| LayoutChild {
-                        sizing: ch.sizing.into(),
-                        node: ch.node.into(),
-                    })
-                    .collect(),
-            }),
-        }
-    }
-}

crates/protocol/tests/conversion_tests.rs

@@ -1,86 +0,0 @@
-use domain::{
-    AlignItems, ContainerNode, Direction, DisplayHint, DisplayHintKind, JustifyContent,
-    LayoutChild, LayoutNode, Sizing, Value, WidgetError, WidgetState,
-};
-use protocol::{
-    WireContainerNode, WireDirection, WireDisplayHint, WireKeyValue, WireLayoutChild,
-    WireLayoutNode, WireSizing, WireValue, WireWidgetError, WireWidgetState,
-};
-use std::collections::BTreeMap;
-
-#[test]
-fn value_converts_to_wire_and_back() {
-    let original = Value::Object(BTreeMap::from([(
-        "items".into(),
-        Value::Array(vec![
-            Value::String("hello".into()),
-            Value::Number(42.0),
-            Value::Bool(true),
-            Value::Null,
-        ]),
-    )]));
-
-    let wire: WireValue = (&original).into();
-    let roundtripped: Value = wire.into();
-    assert_eq!(original, roundtripped);
-}
-
-#[test]
-fn widget_state_with_error_converts_to_wire_and_back() {
-    let original = WidgetState {
-        data: BTreeMap::from([("temp".into(), Value::Number(5.4))]),
-        error: Some(WidgetError::SourceUnavailable),
-    };
-
-    let wire: WireWidgetState = (&original).into();
-    let roundtripped: WidgetState = wire.into();
-    assert_eq!(original, roundtripped);
-}
-
-#[test]
-fn layout_tree_converts_to_wire_and_back() {
-    let original = LayoutNode::Container(ContainerNode {
-        direction: Direction::Row,
-        gap: 4,
-        padding: 2,
-        justify_content: JustifyContent::Start,
-        align_items: AlignItems::Stretch,
-        children: vec![
-            LayoutChild {
-                sizing: Sizing::Flex(1),
-                node: LayoutNode::Leaf(1),
-            },
-            LayoutChild {
-                sizing: Sizing::Fixed(100),
-                node: LayoutNode::Container(ContainerNode {
-                    direction: Direction::Column,
-                    gap: 2,
-                    padding: 0,
-                    justify_content: JustifyContent::Start,
-                    align_items: AlignItems::Stretch,
-                    children: vec![LayoutChild {
-                        sizing: Sizing::Flex(1),
-                        node: LayoutNode::Leaf(2),
-                    }],
-                }),
-            },
-        ],
-    });
-
-    let wire: WireLayoutNode = (&original).into();
-    let roundtripped: LayoutNode = wire.into();
-    assert_eq!(original, roundtripped);
-}
-
-#[test]
-fn display_hint_converts_to_wire_and_back() {
-    for hint in [
-        DisplayHint::new(DisplayHintKind::IconValue),
-        DisplayHint::new(DisplayHintKind::TextBlock),
-        DisplayHint::new(DisplayHintKind::KeyValue),
-    ] {
-        let wire: WireDisplayHint = (&hint).into();
-        let roundtripped: DisplayHint = wire.into();
-        assert_eq!(hint, roundtripped);
-    }
-}

spa/src/components/layout-preview.tsx

@@ -1,6 +1,7 @@
 import { useMemo, useRef } from "react"
 import type { LayoutNode, ThemeConfig, Widget } from "@/api/types"
 import { computeLayout } from "@/lib/layout-engine"
+import { useWidgetPreview } from "@/api/widgets"
 
 interface LayoutPreviewProps {
   layout: LayoutNode
@@ -19,6 +20,91 @@ function collectWidgetIds(node: LayoutNode): number[] {
   return (node.children ?? []).flatMap((c) => collectWidgetIds(c.node))
 }
 
+function formatPreviewData(
+  kind: string,
+  data: Record<string, unknown> | undefined,
+): string {
+  if (!data) return ""
+  const entries = Object.entries(data)
+  if (entries.length === 0) return ""
+
+  switch (kind) {
+    case "key_value":
+      return entries.map(([k, v]) => `${k}: ${v}`).join("\n")
+    case "text_block":
+      return entries.map(([, v]) => String(v ?? "")).join("\n")
+    case "icon_value":
+      return entries.map(([, v]) => String(v ?? "")).join(" ")
+    default:
+      return entries.map(([, v]) => String(v ?? "")).join("\n")
+  }
+}
+
+function WidgetCell({ wid, widget, scale, theme }: {
+  wid: number
+  widget: Widget | undefined
+  scale: number
+  theme: ThemeConfig
+}) {
+  const { data } = useWidgetPreview(wid, true)
+  const hAlign = widget?.display_hint?.h_align ?? "left"
+  const vAlign = widget?.display_hint?.v_align ?? "top"
+  const flexAlign = hAlign === "center" ? "center" : hAlign === "right" ? "flex-end" : "flex-start"
+  const flexJustify = vAlign === "middle" ? "center" : vAlign === "bottom" ? "flex-end" : "flex-start"
+  const textAlign = hAlign === "center" ? "center" as const : hAlign === "right" ? "right" as const : "left" as const
+
+  const kind = widget?.display_hint?.kind ?? "text_block"
+  const previewText = formatPreviewData(kind, data as Record<string, unknown> | undefined)
+  const hasData = previewText.length > 0
+
+  return (
+    <div
+      style={{
+        display: "flex",
+        flexDirection: "column",
+        alignItems: flexAlign,
+        justifyContent: flexJustify,
+        width: "100%",
+        height: "100%",
+      }}
+    >
+      {hasData ? (
+        <span
+          style={{
+            fontSize: 8 * scale,
+            color: colorToCSS(theme.text),
+            textAlign,
+            lineHeight: 1.3,
+            whiteSpace: "pre-wrap",
+            wordBreak: "break-word",
+          }}
+        >
+          {previewText}
+        </span>
+      ) : (
+        <>
+          <span
+            style={{
+              fontSize: 10 * scale,
+              color: colorToCSS(theme.text),
+              textAlign,
+              lineHeight: 1.2,
+              opacity: 0.5,
+            }}
+          >
+            {widget?.name ?? `#${wid}`}
+          </span>
+          {widget && (
+            <span style={{ fontSize: 7 * scale, color: colorToCSS(theme.accent), textAlign, opacity: 0.5 }}>
+              {kind}
+            </span>
+          )}
+        </>
+      )}
+    </div>
+  )
+}
+
 export function LayoutPreview({
   layout,
   screenWidth,
@@ -54,11 +140,6 @@ export function LayoutPreview({
           const box = bounds.get(wid)
           if (!box) return null
           const w = widgets.find((w) => w.id === wid)
-          const hAlign = w?.display_hint?.h_align ?? "left"
-          const vAlign = w?.display_hint?.v_align ?? "top"
-          const flexAlign = hAlign === "center" ? "center" : hAlign === "right" ? "flex-end" : "flex-start"
-          const flexJustify = vAlign === "middle" ? "center" : vAlign === "bottom" ? "flex-end" : "flex-start"
-          const textAlign = hAlign === "center" ? "center" as const : hAlign === "right" ? "right" as const : "left" as const
           return (
             <div
               key={wid}
@@ -70,35 +151,11 @@ export function LayoutPreview({
                 height: box.height * scale,
                 border: `1px solid ${colorToCSS(theme.secondary)}`,
                 boxSizing: "border-box",
-                display: "flex",
-                flexDirection: "column",
-                alignItems: flexAlign,
-                justifyContent: flexJustify,
                 overflow: "hidden",
                 padding: 2 * scale,
               }}
             >
-              <span
-                style={{
-                  fontSize: 10 * scale,
-                  color: colorToCSS(theme.text),
-                  textAlign,
-                  lineHeight: 1.2,
-                }}
-              >
-                {w?.name ?? `#${wid}`}
-              </span>
-              {w && (
-                <span
-                  style={{
-                    fontSize: 8 * scale,
-                    color: colorToCSS(theme.accent),
-                    textAlign,
-                  }}
-                >
-                  {w.display_hint.kind}
-                </span>
-              )}
+              <WidgetCell wid={wid} widget={w} scale={scale} theme={theme} />
             </div>
           )
         })}

spa/src/pages/data-sources.tsx

@@ -1,4 +1,4 @@
-import { useState } from "react"
+import { useState, useEffect } from "react"
 import {
   useDataSources,
   useCreateDataSource,
@@ -14,13 +14,6 @@ import {
   CardHeader,
   CardTitle,
 } from "@/components/ui/card"
-import {
-  Dialog,
-  DialogContent,
-  DialogHeader,
-  DialogTitle,
-  DialogFooter,
-} from "@/components/ui/dialog"
 import { Input } from "@/components/ui/input"
 import { Label } from "@/components/ui/label"
 import {
@@ -30,28 +23,12 @@ import {
   SelectTrigger,
   SelectValue,
 } from "@/components/ui/select"
-import {
-  AlertDialog,
-  AlertDialogAction,
-  AlertDialogCancel,
-  AlertDialogContent,
-  AlertDialogDescription,
-  AlertDialogFooter,
-  AlertDialogHeader,
-  AlertDialogTitle,
-} from "@/components/ui/alert-dialog"
 import { Badge } from "@/components/ui/badge"
-import { Plus, Pencil, Trash2, X, Eye, EyeOff } from "lucide-react"
+import { Plus, Pencil, Trash2, X, Eye, EyeOff, ChevronUp } from "lucide-react"
 import { toast } from "sonner"
 
 const SOURCE_TYPES: SourceType[] = [
-  "weather",
-  "media",
-  "rss",
-  "http_json",
-  "webhook",
-  "clock",
-  "static_text",
+  "weather", "media", "rss", "http_json", "webhook", "clock", "static_text",
 ]
 
 const EXTERNAL_TYPES: SourceType[] = ["weather", "media", "rss", "http_json", "webhook"]
@@ -70,83 +47,158 @@ const EMPTY: DataSource = {
   config: { type: "external", url: null, api_key: null, headers: [] },
 }
 
+const VALID_TIMEZONES = new Set(Intl.supportedValuesOf("timeZone"))
+
+const STRFTIME_MAP: Record<string, (d: Date) => string> = {
+  "%H": (d) => String(d.getHours()).padStart(2, "0"),
+  "%M": (d) => String(d.getMinutes()).padStart(2, "0"),
+  "%S": (d) => String(d.getSeconds()).padStart(2, "0"),
+  "%I": (d) => String(d.getHours() % 12 || 12).padStart(2, "0"),
+  "%p": (d) => (d.getHours() >= 12 ? "PM" : "AM"),
+  "%Y": (d) => String(d.getFullYear()),
+  "%m": (d) => String(d.getMonth() + 1).padStart(2, "0"),
+  "%d": (d) => String(d.getDate()).padStart(2, "0"),
+}
+
+function formatClockPreview(fmt: string, tz: string): string {
+  try {
+    const parts = new Intl.DateTimeFormat("en-US", {
+      timeZone: tz,
+      year: "numeric", month: "2-digit", day: "2-digit",
+      hour: "2-digit", minute: "2-digit", second: "2-digit",
+      hour12: false,
+    }).formatToParts(new Date())
+
+    const get = (type: string) => parts.find((p) => p.type === type)?.value ?? ""
+    const h24 = Number(get("hour"))
+    const fakeDate = new Date(2000, 0, 1, h24, Number(get("minute")), Number(get("second")))
+
+    let result = fmt
+    for (const [token, fn] of Object.entries(STRFTIME_MAP)) {
+      if (token === "%Y") result = result.replaceAll(token, get("year"))
+      else if (token === "%m") result = result.replaceAll(token, get("month"))
+      else if (token === "%d") result = result.replaceAll(token, get("day"))
+      else result = result.replaceAll(token, fn(fakeDate))
+    }
+    return result
+  } catch {
+    return "invalid timezone"
+  }
+}
+
+function isValidSave(ds: DataSource): boolean {
+  if (!ds.name) return false
+  if (EXTERNAL_TYPES.includes(ds.source_type) && ds.source_type !== "webhook" && ds.poll_interval_secs <= 0) return false
+  if (EXTERNAL_TYPES.includes(ds.source_type) && ds.source_type !== "webhook" && ds.config.type === "external" && !ds.config.url) return false
+  return true
+}
+
 export function DataSourcesPage() {
   const { data: sources = [], isLoading } = useDataSources()
   const create = useCreateDataSource()
   const update = useUpdateDataSource()
   const del = useDeleteDataSource()
 
-  const [editing, setEditing] = useState<DataSource | null>(null)
-  const [deleting, setDeleting] = useState<number | null>(null)
+  const [editingId, setEditingId] = useState<number | null>(null)
+  const [editingData, setEditingData] = useState<DataSource | null>(null)
+  const [newSource, setNewSource] = useState<DataSource | null>(null)
+  const [confirmingDelete, setConfirmingDelete] = useState<number | null>(null)
 
   function openNew() {
-    const nextId =
-      sources.length > 0 ? Math.max(...sources.map((s) => s.id)) + 1 : 1
-    setEditing({ ...EMPTY, id: nextId })
+    const nextId = sources.length > 0 ? Math.max(...sources.map((s) => s.id)) + 1 : 1
+    setNewSource({ ...EMPTY, id: nextId })
+    setEditingId(null)
   }
 
-  function openEdit(ds: DataSource) {
-    setEditing({ ...ds })
+  function startEdit(ds: DataSource) {
+    setEditingId(ds.id)
+    setEditingData({ ...ds })
+    setNewSource(null)
   }
 
-  async function save() {
-    if (!editing) return
-    const isNew = !sources.some((s) => s.id === editing.id)
+  function cancelEdit() {
+    setEditingId(null)
+    setEditingData(null)
+    setNewSource(null)
+  }
+
+  async function saveExisting() {
+    if (!editingData) return
     try {
-      if (isNew) {
-        await create.mutateAsync(editing)
-        toast.success("Data source created")
-      } else {
-        await update.mutateAsync(editing)
-        toast.success("Data source updated")
-      }
-      setEditing(null)
+      await update.mutateAsync(editingData)
+      toast.success("Data source updated")
+      setEditingId(null)
+      setEditingData(null)
     } catch (e) {
       toast.error(String(e))
     }
   }
 
-  async function confirmDelete() {
-    if (deleting == null) return
+  async function saveNew() {
+    if (!newSource) return
     try {
-      await del.mutateAsync(deleting)
+      await create.mutateAsync(newSource)
+      toast.success("Data source created")
+      setNewSource(null)
+    } catch (e) {
+      toast.error(String(e))
+    }
+  }
+
+  async function confirmDelete(id: number) {
+    try {
+      await del.mutateAsync(id)
       toast.success("Data source deleted")
     } catch (e) {
       toast.error(String(e))
     }
-    setDeleting(null)
+    setConfirmingDelete(null)
   }
 
-  if (isLoading) return <div className="text-muted-foreground p-4">Loading…</div>
+  if (isLoading) return <div className="text-muted-foreground p-4">Loading...</div>
 
   return (
     <div className="space-y-6">
       <div className="flex items-center justify-between">
         <div>
-          <h1 className="text-2xl font-semibold tracking-tight">
-            Data Sources
-          </h1>
-          <p className="text-muted-foreground text-sm">
-            Configure external data feeds
-          </p>
+          <h1 className="text-2xl font-semibold tracking-tight">Data Sources</h1>
+          <p className="text-muted-foreground text-sm">Configure data feeds</p>
         </div>
-        <Button onClick={openNew}>
+        <Button onClick={openNew} disabled={!!newSource}>
           <Plus className="mr-2 h-4 w-4" />
           Add Source
         </Button>
       </div>
 
-      {sources.length === 0 ? (
-        <Card>
-          <CardContent className="py-12 text-center">
-            <p className="text-muted-foreground">
-              No data sources configured yet.
-            </p>
-          </CardContent>
-        </Card>
-      ) : (
-        <div className="grid gap-3">
-          {sources.map((ds) => (
+      <div className="grid gap-3">
+        {newSource && (
+          <Card className="border-primary">
+            <CardHeader className="py-3">
+              <CardTitle className="text-base">New Data Source</CardTitle>
+            </CardHeader>
+            <CardContent className="space-y-4">
+              <DataSourceForm value={newSource} onChange={setNewSource} />
+              <div className="flex gap-2 justify-end">
+                <Button variant="outline" size="sm" onClick={cancelEdit}>Cancel</Button>
+                <Button size="sm" onClick={saveNew} disabled={!isValidSave(newSource)}>Save</Button>
+              </div>
+            </CardContent>
+          </Card>
+        )}
+
+        {sources.length === 0 && !newSource && (
+          <Card>
+            <CardContent className="py-12 text-center">
+              <p className="text-muted-foreground">No data sources configured yet.</p>
+            </CardContent>
+          </Card>
+        )}
+
+        {sources.map((ds) => {
+          const isEditing = editingId === ds.id
+          const isDeleting = confirmingDelete === ds.id
+
+          return (
             <Card key={ds.id}>
               <CardHeader className="flex flex-row items-center justify-between py-3">
                 <div className="space-y-1">
@@ -155,91 +207,43 @@ export function DataSourcesPage() {
                     <Badge variant="secondary">{ds.source_type}</Badge>
                     {ds.poll_interval_secs > 0 && <span>every {ds.poll_interval_secs}s</span>}
                     {ds.config.type === "external" && ds.config.url && (
-                      <span className="text-muted-foreground max-w-xs truncate text-xs">
-                        {ds.config.url}
-                      </span>
+                      <span className="text-muted-foreground max-w-xs truncate text-xs">{ds.config.url}</span>
                     )}
                   </CardDescription>
                 </div>
                 <div className="flex gap-1">
-                  <Button
-                    variant="ghost"
-                    size="icon"
-                    onClick={() => openEdit(ds)}
-                  >
-                    <Pencil className="h-4 w-4" />
+                  <Button variant="ghost" size="icon" onClick={() => isEditing ? cancelEdit() : startEdit(ds)}>
+                    {isEditing ? <ChevronUp className="h-4 w-4" /> : <Pencil className="h-4 w-4" />}
                   </Button>
-                  <Button
-                    variant="ghost"
-                    size="icon"
-                    onClick={() => setDeleting(ds.id)}
-                  >
+                  <Button variant="ghost" size="icon" onClick={() => setConfirmingDelete(isDeleting ? null : ds.id)}>
                     <Trash2 className="h-4 w-4" />
                   </Button>
                 </div>
               </CardHeader>
+
+              {isDeleting && (
+                <CardContent className="pt-0">
+                  <div className="flex gap-2 items-center p-2 bg-destructive/10 rounded">
+                    <span className="text-sm flex-1">Delete? Widgets referencing it will lose their feed.</span>
+                    <Button size="sm" variant="destructive" onClick={() => confirmDelete(ds.id)}>Delete</Button>
+                    <Button size="sm" variant="ghost" onClick={() => setConfirmingDelete(null)}>Cancel</Button>
+                  </div>
+                </CardContent>
+              )}
+
+              {isEditing && editingData && (
+                <CardContent className="space-y-4 pt-0">
+                  <DataSourceForm value={editingData} onChange={setEditingData} />
+                  <div className="flex gap-2 justify-end">
+                    <Button variant="outline" size="sm" onClick={cancelEdit}>Cancel</Button>
+                    <Button size="sm" onClick={saveExisting} disabled={!isValidSave(editingData)}>Save</Button>
+                  </div>
+                </CardContent>
+              )}
             </Card>
-          ))}
-        </div>
-      )}
-
-      {/* Edit / Create Dialog */}
-      <Dialog open={!!editing} onOpenChange={(o) => !o && setEditing(null)}>
-        <DialogContent>
-          <DialogHeader>
-            <DialogTitle>
-              {editing && sources.some((s) => s.id === editing.id)
-                ? "Edit Data Source"
-                : "New Data Source"}
-            </DialogTitle>
-          </DialogHeader>
-          {editing && (
-            <DataSourceForm value={editing} onChange={setEditing} />
-          )}
-          <DialogFooter>
-            <Button variant="outline" onClick={() => setEditing(null)}>
-              Cancel
-            </Button>
-            <Button
-              onClick={save}
-              disabled={
-                !editing?.name ||
-                (EXTERNAL_TYPES.includes(editing.source_type) &&
-                  editing.source_type !== "webhook" &&
-                  editing.poll_interval_secs <= 0) ||
-                (EXTERNAL_TYPES.includes(editing.source_type) &&
-                  editing.source_type !== "webhook" &&
-                  editing.config.type === "external" &&
-                  !editing.config.url)
-              }
-            >
-              Save
-            </Button>
-          </DialogFooter>
-        </DialogContent>
-      </Dialog>
-
-      {/* Delete Confirmation */}
-      <AlertDialog
-        open={deleting != null}
-        onOpenChange={(o) => !o && setDeleting(null)}
-      >
-        <AlertDialogContent>
-          <AlertDialogHeader>
-            <AlertDialogTitle>Delete data source?</AlertDialogTitle>
-            <AlertDialogDescription>
-              This will permanently remove this data source. Widgets referencing
-              it will lose their feed.
-            </AlertDialogDescription>
-          </AlertDialogHeader>
-          <AlertDialogFooter>
-            <AlertDialogCancel>Cancel</AlertDialogCancel>
-            <AlertDialogAction onClick={confirmDelete}>
-              Delete
-            </AlertDialogAction>
-          </AlertDialogFooter>
-        </AlertDialogContent>
-      </AlertDialog>
+          )
+        })}
+      </div>
     </div>
   )
 }
@@ -251,11 +255,7 @@ function isSensitiveKey(key: string) {
 }
 
 function HeaderRow({
-  headerKey,
-  headerValue,
-  onChangeKey,
-  onChangeValue,
-  onRemove,
+  headerKey, headerValue, onChangeKey, onChangeValue, onRemove,
 }: {
   headerKey: string
   headerValue: string
@@ -268,12 +268,7 @@ function HeaderRow({
 
   return (
     <div className="flex items-center gap-2">
-      <Input
-        value={headerKey}
-        onChange={(e) => onChangeKey(e.target.value)}
-        placeholder="key"
-        className="flex-1"
-      />
+      <Input value={headerKey} onChange={(e) => onChangeKey(e.target.value)} placeholder="key" className="flex-1" />
       <div className="relative flex-1">
         <Input
           type={sensitive && !visible ? "password" : "text"}
@@ -283,17 +278,8 @@ function HeaderRow({
           className={sensitive ? "pr-9" : ""}
         />
         {sensitive && (
-          <Button
-            variant="ghost"
-            size="icon"
-            className="absolute top-0 right-0 h-full w-9"
-            onClick={() => setVisible((v) => !v)}
-          >
-            {visible ? (
-              <EyeOff className="h-3.5 w-3.5" />
-            ) : (
-              <Eye className="h-3.5 w-3.5" />
-            )}
+          <Button variant="ghost" size="icon" className="absolute top-0 right-0 h-full w-9" onClick={() => setVisible((v) => !v)}>
+            {visible ? <EyeOff className="h-3.5 w-3.5" /> : <Eye className="h-3.5 w-3.5" />}
           </Button>
         )}
       </div>
@@ -304,13 +290,28 @@ function HeaderRow({
   )
 }
 
-function DataSourceForm({
-  value,
-  onChange,
-}: {
-  value: DataSource
-  onChange: (ds: DataSource) => void
-}) {
+function ClockPreview({ format, timezone }: { format: string; timezone: string }) {
+  const [preview, setPreview] = useState("")
+
+  useEffect(() => {
+    setPreview(formatClockPreview(format, timezone))
+    const id = setInterval(() => setPreview(formatClockPreview(format, timezone)), 1000)
+    return () => clearInterval(id)
+  }, [format, timezone])
+
+  const validTz = VALID_TIMEZONES.has(timezone)
+
+  return (
+    <div className="space-y-1">
+      <p className="text-muted-foreground text-sm font-mono">{preview}</p>
+      {timezone && !validTz && (
+        <p className="text-destructive text-xs">Unknown timezone</p>
+      )}
+    </div>
+  )
+}
+
+function DataSourceForm({ value, onChange }: { value: DataSource; onChange: (ds: DataSource) => void }) {
   const set = <K extends keyof DataSource>(k: K, v: DataSource[K]) =>
     onChange({ ...value, [k]: v })
 
@@ -326,29 +327,18 @@ function DataSourceForm({
   const isStaticText = value.config.type === "static_text"
 
   return (
-    <div className="grid gap-4 py-2">
+    <div className="grid gap-4">
       <div className="grid gap-2">
         <Label>Name</Label>
-        <Input
-          value={value.name}
-          onChange={(e) => set("name", e.target.value)}
-          placeholder="e.g. weather"
-        />
+        <Input value={value.name} onChange={(e) => set("name", e.target.value)} placeholder="e.g. weather" />
       </div>
       <div className="grid gap-2">
         <Label>Source Type</Label>
-        <Select
-          value={value.source_type}
-          onValueChange={(v) => onSourceTypeChange(v as SourceType)}
-        >
-          <SelectTrigger>
-            <SelectValue />
-          </SelectTrigger>
+        <Select value={value.source_type} onValueChange={(v) => onSourceTypeChange(v as SourceType)}>
+          <SelectTrigger><SelectValue /></SelectTrigger>
           <SelectContent>
             {SOURCE_TYPES.map((t) => (
-              <SelectItem key={t} value={t}>
-                {t}
-              </SelectItem>
+              <SelectItem key={t} value={t}>{t}</SelectItem>
             ))}
           </SelectContent>
         </Select>
@@ -358,20 +348,11 @@ function DataSourceForm({
         <>
           <div className="grid gap-2">
             <Label>URL</Label>
-            <Input
-              value={value.config.url ?? ""}
-              onChange={(e) => setConfig({ url: e.target.value || null })}
-              placeholder="https://..."
-            />
+            <Input value={value.config.url ?? ""} onChange={(e) => setConfig({ url: e.target.value || null })} placeholder="https://..." />
           </div>
           <div className="grid gap-2">
             <Label>API Key</Label>
-            <Input
-              type="password"
-              value={value.config.api_key ?? ""}
-              onChange={(e) => setConfig({ api_key: e.target.value || null })}
-              placeholder="Optional"
-            />
+            <Input type="password" value={value.config.api_key ?? ""} onChange={(e) => setConfig({ api_key: e.target.value || null })} placeholder="Optional" />
           </div>
         </>
       )}
@@ -380,55 +361,33 @@ function DataSourceForm({
         <>
           <div className="grid gap-2">
             <Label>Format</Label>
-            <Input
-              value={value.config.format}
-              onChange={(e) => setConfig({ format: e.target.value })}
-              placeholder="%H:%M:%S"
-            />
+            <Input value={value.config.format} onChange={(e) => setConfig({ format: e.target.value })} placeholder="%H:%M:%S" />
           </div>
           <div className="grid gap-2">
             <Label>Timezone</Label>
-            <Input
-              value={value.config.timezone}
-              onChange={(e) => setConfig({ timezone: e.target.value })}
-              placeholder="Europe/Warsaw"
-            />
+            <Input value={value.config.timezone} onChange={(e) => setConfig({ timezone: e.target.value })} placeholder="Europe/Warsaw" />
           </div>
+          <ClockPreview format={value.config.format} timezone={value.config.timezone} />
         </>
       )}
 
       {isStaticText && (
         <div className="grid gap-2">
           <Label>Text</Label>
-          <Input
-            value={value.config.text}
-            onChange={(e) => setConfig({ text: e.target.value })}
-            placeholder="Hello world"
-          />
+          <Input value={value.config.text} onChange={(e) => setConfig({ text: e.target.value })} placeholder="Hello world" />
         </div>
       )}
 
       <div className="grid gap-2">
         <Label>Poll Interval (seconds)</Label>
-        <Input
-          type="number"
-          value={value.poll_interval_secs}
-          onChange={(e) => set("poll_interval_secs", Number(e.target.value))}
-          min={1}
-        />
+        <Input type="number" value={value.poll_interval_secs} onChange={(e) => set("poll_interval_secs", Number(e.target.value))} min={1} />
       </div>
 
       {isExternal && (
         <div className="grid gap-2">
           <div className="flex items-center justify-between">
             <Label>Headers</Label>
-            <Button
-              variant="outline"
-              size="sm"
-              onClick={() =>
-                setConfig({ headers: [...value.config.headers, ["", ""]] })
-              }
-            >
+            <Button variant="outline" size="sm" onClick={() => setConfig({ headers: [...value.config.headers, ["", ""]] })}>
               <Plus className="mr-1 h-3 w-3" />
               Add
             </Button>
@@ -448,9 +407,7 @@ function DataSourceForm({
                 next[i] = [k, newVal]
                 setConfig({ headers: next })
               }}
-              onRemove={() =>
-                setConfig({ headers: value.config.headers.filter((_, idx) => idx !== i) })
-              }
+              onRemove={() => setConfig({ headers: value.config.headers.filter((_, idx) => idx !== i) })}
             />
           ))}
         </div>

spa/src/pages/layout-builder.tsx

@@ -18,16 +18,6 @@ import {
   SelectTrigger,
   SelectValue,
 } from "@/components/ui/select"
-import {
-  AlertDialog,
-  AlertDialogAction,
-  AlertDialogCancel,
-  AlertDialogContent,
-  AlertDialogDescription,
-  AlertDialogFooter,
-  AlertDialogHeader,
-  AlertDialogTitle,
-} from "@/components/ui/alert-dialog"
 import { Input } from "@/components/ui/input"
 import { Label } from "@/components/ui/label"
 import { Badge } from "@/components/ui/badge"
@@ -287,7 +277,15 @@ export function LayoutBuilderPage() {
                 onAddContainer={(path, dir) =>
                   addChild(path, makeContainerChild(dir))
                 }
-                onRemove={() => setPendingDelete(selected)}
+                pendingDelete={pendingDelete}
+                onRequestDelete={() => setPendingDelete(selected)}
+                onConfirmDelete={() => {
+                  if (pendingDelete !== null) {
+                    removeChild(pendingDelete)
+                    setPendingDelete(null)
+                  }
+                }}
+                onCancelDelete={() => setPendingDelete(null)}
                 onUpdateSizing={(sizing) => updateSizing(selected, sizing)}
                 isRoot={selected.length === 0}
                 widgets={widgets}
@@ -296,7 +294,15 @@ export function LayoutBuilderPage() {
               <LeafProps
                 path={selected}
                 widgetId={selectedNode?.widget_id ?? 0}
-                onRemove={() => setPendingDelete(selected)}
+                pendingDelete={pendingDelete}
+                onRequestDelete={() => setPendingDelete(selected)}
+                onConfirmDelete={() => {
+                  if (pendingDelete !== null) {
+                    removeChild(pendingDelete)
+                    setPendingDelete(null)
+                  }
+                }}
+                onCancelDelete={() => setPendingDelete(null)}
                 onUpdateSizing={(sizing) => updateSizing(selected, sizing)}
                 widgets={widgets}
                 sizing={
@@ -317,39 +323,6 @@ export function LayoutBuilderPage() {
         </Card>
       </div>
 
-      <AlertDialog
-        open={pendingDelete !== null}
-        onOpenChange={(o) => !o && setPendingDelete(null)}
-      >
-        <AlertDialogContent>
-          <AlertDialogHeader>
-            <AlertDialogTitle>
-              {pendingDelete?.length === 0
-                ? "Clear entire layout?"
-                : "Remove this node?"}
-            </AlertDialogTitle>
-            <AlertDialogDescription>
-              {pendingDelete?.length === 0
-                ? "This will remove the entire layout tree. You can rebuild it afterward."
-                : "This will remove the selected node and all its children."}
-            </AlertDialogDescription>
-          </AlertDialogHeader>
-          <AlertDialogFooter>
-            <AlertDialogCancel>Cancel</AlertDialogCancel>
-            <AlertDialogAction
-              onClick={() => {
-                if (pendingDelete !== null) {
-                  removeChild(pendingDelete)
-                  setPendingDelete(null)
-                }
-              }}
-            >
-              {pendingDelete?.length === 0 ? "Clear" : "Remove"}
-            </AlertDialogAction>
-          </AlertDialogFooter>
-        </AlertDialogContent>
-      </AlertDialog>
-
       {showPreview && root && theme && (
         <Card>
           <CardHeader className="pb-3">
@@ -493,7 +466,10 @@ function ContainerProps({
   onUpdateProp,
   onAddWidget,
   onAddContainer,
-  onRemove,
+  pendingDelete,
+  onRequestDelete,
+  onConfirmDelete,
+  onCancelDelete,
   onUpdateSizing,
   isRoot,
   widgets,
@@ -503,7 +479,10 @@ function ContainerProps({
   onUpdateProp: (path: Path, prop: "gap" | "padding" | "direction" | "justify_content" | "align_items", value: number | string) => void
   onAddWidget: (path: Path, widgetId: number) => void
   onAddContainer: (path: Path, direction: Direction) => void
-  onRemove: () => void
+  pendingDelete: Path | null
+  onRequestDelete: () => void
+  onConfirmDelete: () => void
+  onCancelDelete: () => void
   onUpdateSizing: (sizing: LayoutChild["sizing"]) => void
   isRoot: boolean
   widgets: { id: number; name: string }[]
@@ -622,14 +601,37 @@ function ContainerProps({
           </Select>
         )}
       </div>
-      <Button
-        variant="destructive"
-        size="sm"
-        onClick={onRemove}
-      >
-        <Trash2 className="mr-1 h-3 w-3" />
-        {isRoot ? "Clear Layout" : "Remove"}
-      </Button>
+      {pendingDelete !== null &&
+      JSON.stringify(pendingDelete) === JSON.stringify(path) ? (
+        <div className="grid gap-2">
+          <p className="text-sm text-destructive">
+            {isRoot
+              ? "Clear entire layout? You can rebuild afterward."
+              : "Remove this node and all its children?"}
+          </p>
+          <div className="flex gap-2">
+            <Button
+              variant="destructive"
+              size="sm"
+              onClick={onConfirmDelete}
+            >
+              {isRoot ? "Clear" : "Remove"}
+            </Button>
+            <Button variant="outline" size="sm" onClick={onCancelDelete}>
+              Cancel
+            </Button>
+          </div>
+        </div>
+      ) : (
+        <Button
+          variant="destructive"
+          size="sm"
+          onClick={onRequestDelete}
+        >
+          <Trash2 className="mr-1 h-3 w-3" />
+          {isRoot ? "Clear Layout" : "Remove"}
+        </Button>
+      )}
     </div>
   )
 }
@@ -637,14 +639,20 @@ function ContainerProps({
 function LeafProps({
   path,
   widgetId,
-  onRemove,
+  pendingDelete,
+  onRequestDelete,
+  onConfirmDelete,
+  onCancelDelete,
   onUpdateSizing,
   widgets,
   sizing,
 }: {
   path: Path
   widgetId: number
-  onRemove: () => void
+  pendingDelete: Path | null
+  onRequestDelete: () => void
+  onConfirmDelete: () => void
+  onCancelDelete: () => void
   onUpdateSizing: (sizing: LayoutChild["sizing"]) => void
   widgets: { id: number; name: string }[]
   sizing?: LayoutChild["sizing"]
@@ -657,10 +665,31 @@ function LeafProps({
         <p className="text-sm">{w?.name ?? `#${widgetId}`}</p>
       </div>
       {sizing && <SizingEditor path={path} onUpdate={onUpdateSizing} sizing={sizing} />}
-      <Button variant="destructive" size="sm" onClick={onRemove}>
-        <Trash2 className="mr-1 h-3 w-3" />
-        Remove
-      </Button>
+      {pendingDelete !== null &&
+      JSON.stringify(pendingDelete) === JSON.stringify(path) ? (
+        <div className="grid gap-2">
+          <p className="text-sm text-destructive">
+            Remove this widget?
+          </p>
+          <div className="flex gap-2">
+            <Button
+              variant="destructive"
+              size="sm"
+              onClick={onConfirmDelete}
+            >
+              Remove
+            </Button>
+            <Button variant="outline" size="sm" onClick={onCancelDelete}>
+              Cancel
+            </Button>
+          </div>
+        </div>
+      ) : (
+        <Button variant="destructive" size="sm" onClick={onRequestDelete}>
+          <Trash2 className="mr-1 h-3 w-3" />
+          Remove
+        </Button>
+      )}
     </div>
   )
 }

spa/src/pages/presets.tsx

@@ -15,26 +15,8 @@ import {
   CardHeader,
   CardTitle,
 } from "@/components/ui/card"
-import {
-  Dialog,
-  DialogContent,
-  DialogHeader,
-  DialogTitle,
-  DialogFooter,
-} from "@/components/ui/dialog"
-import {
-  AlertDialog,
-  AlertDialogAction,
-  AlertDialogCancel,
-  AlertDialogContent,
-  AlertDialogDescription,
-  AlertDialogFooter,
-  AlertDialogHeader,
-  AlertDialogTitle,
-} from "@/components/ui/alert-dialog"
 import { Input } from "@/components/ui/input"
-import { Label } from "@/components/ui/label"
-import { Save, Upload, Trash2 } from "lucide-react"
+import { Save, Upload, Trash2, ChevronUp } from "lucide-react"
 import { toast } from "sonner"
 
 export function PresetsPage() {
@@ -45,22 +27,22 @@ export function PresetsPage() {
   const loadPreset = useLoadPreset()
 
   const [saving, setSaving] = useState(false)
-  const [saveName, setSaveName] = useState("")
-  const [deleting, setDeleting] = useState<number | null>(null)
+  const [presetName, setPresetName] = useState("")
+  const [confirmingDelete, setConfirmingDelete] = useState<number | null>(null)
 
   async function saveAsPreset() {
-    if (!layout || !saveName) return
+    if (!layout || !presetName) return
     const nextId =
       presets.length > 0 ? Math.max(...presets.map((p) => p.id)) + 1 : 1
     try {
       await createPreset.mutateAsync({
         id: nextId,
-        name: saveName,
+        name: presetName,
         layout,
       })
       toast.success("Preset saved")
       setSaving(false)
-      setSaveName("")
+      setPresetName("")
     } catch (e) {
       toast.error(String(e))
     }
@@ -75,15 +57,14 @@ export function PresetsPage() {
     }
   }
 
-  async function confirmDelete() {
-    if (deleting == null) return
+  async function confirmDelete(id: number) {
     try {
-      await deletePreset.mutateAsync(deleting)
+      await deletePreset.mutateAsync(id)
       toast.success("Preset deleted")
     } catch (e) {
       toast.error(String(e))
     }
-    setDeleting(null)
+    setConfirmingDelete(null)
   }
 
   function nodeCount(node: Preset["layout"]["root"]): number {
@@ -104,12 +85,50 @@ export function PresetsPage() {
             Save and restore layout configurations
           </p>
         </div>
-        <Button onClick={() => setSaving(true)} disabled={!layout}>
-          <Save className="mr-2 h-4 w-4" />
-          Save Current Layout
+        <Button
+          onClick={() => setSaving((v) => !v)}
+          disabled={!layout}
+          variant={saving ? "secondary" : "default"}
+        >
+          {saving ? (
+            <ChevronUp className="mr-2 h-4 w-4" />
+          ) : (
+            <Save className="mr-2 h-4 w-4" />
+          )}
+          {saving ? "Close" : "Save Current Layout"}
         </Button>
       </div>
 
+      {saving && (
+        <Card>
+          <CardHeader className="py-3">
+            <CardTitle className="text-base">Save Current Layout as Preset</CardTitle>
+          </CardHeader>
+          <CardContent className="flex items-center gap-2 pb-3">
+            <Input
+              value={presetName}
+              onChange={(e) => setPresetName(e.target.value)}
+              placeholder="e.g. dashboard"
+              onKeyDown={(e) => e.key === "Enter" && saveAsPreset()}
+              autoFocus
+            />
+            <Button onClick={saveAsPreset} disabled={!presetName} size="sm">
+              Save
+            </Button>
+            <Button
+              variant="outline"
+              size="sm"
+              onClick={() => {
+                setSaving(false)
+                setPresetName("")
+              }}
+            >
+              Cancel
+            </Button>
+          </CardContent>
+        </Card>
+      )}
+
       {presets.length === 0 ? (
         <Card>
           <CardContent className="py-12 text-center">
@@ -128,69 +147,47 @@ export function PresetsPage() {
                   </CardDescription>
                 </div>
                 <div className="flex gap-1">
-                  <Button variant="outline" size="sm" onClick={() => load(p.id)}>
-                    <Upload className="mr-1 h-3 w-3" />
-                    Load
-                  </Button>
-                  <Button
-                    variant="ghost"
-                    size="icon"
-                    onClick={() => setDeleting(p.id)}
-                  >
-                    <Trash2 className="h-4 w-4" />
-                  </Button>
+                  {confirmingDelete === p.id ? (
+                    <>
+                      <span className="text-sm text-muted-foreground self-center mr-1">
+                        Delete?
+                      </span>
+                      <Button
+                        variant="destructive"
+                        size="sm"
+                        onClick={() => confirmDelete(p.id)}
+                      >
+                        Delete
+                      </Button>
+                      <Button
+                        variant="outline"
+                        size="sm"
+                        onClick={() => setConfirmingDelete(null)}
+                      >
+                        Cancel
+                      </Button>
+                    </>
+                  ) : (
+                    <>
+                      <Button variant="outline" size="sm" onClick={() => load(p.id)}>
+                        <Upload className="mr-1 h-3 w-3" />
+                        Load
+                      </Button>
+                      <Button
+                        variant="ghost"
+                        size="icon"
+                        onClick={() => setConfirmingDelete(p.id)}
+                      >
+                        <Trash2 className="h-4 w-4" />
+                      </Button>
+                    </>
+                  )}
                 </div>
               </CardHeader>
             </Card>
           ))}
         </div>
       )}
-
-      <Dialog open={saving} onOpenChange={(o) => !o && setSaving(false)}>
-        <DialogContent>
-          <DialogHeader>
-            <DialogTitle>Save Current Layout as Preset</DialogTitle>
-          </DialogHeader>
-          <div className="grid gap-4 py-2">
-            <div className="grid gap-2">
-              <Label>Preset Name</Label>
-              <Input
-                value={saveName}
-                onChange={(e) => setSaveName(e.target.value)}
-                placeholder="e.g. dashboard"
-              />
-            </div>
-          </div>
-          <DialogFooter>
-            <Button variant="outline" onClick={() => setSaving(false)}>
-              Cancel
-            </Button>
-            <Button onClick={saveAsPreset} disabled={!saveName}>
-              Save
-            </Button>
-          </DialogFooter>
-        </DialogContent>
-      </Dialog>
-
-      <AlertDialog
-        open={deleting != null}
-        onOpenChange={(o) => !o && setDeleting(null)}
-      >
-        <AlertDialogContent>
-          <AlertDialogHeader>
-            <AlertDialogTitle>Delete preset?</AlertDialogTitle>
-            <AlertDialogDescription>
-              This will permanently remove this preset.
-            </AlertDialogDescription>
-          </AlertDialogHeader>
-          <AlertDialogFooter>
-            <AlertDialogCancel>Cancel</AlertDialogCancel>
-            <AlertDialogAction onClick={confirmDelete}>
-              Delete
-            </AlertDialogAction>
-          </AlertDialogFooter>
-        </AlertDialogContent>
-      </AlertDialog>
     </div>
   )
 }

spa/src/pages/widgets.tsx

@@ -16,13 +16,6 @@ import {
   CardHeader,
   CardTitle,
 } from "@/components/ui/card"
-import {
-  Dialog,
-  DialogContent,
-  DialogHeader,
-  DialogTitle,
-  DialogFooter,
-} from "@/components/ui/dialog"
 import { Input } from "@/components/ui/input"
 import { Label } from "@/components/ui/label"
 import {
@@ -32,18 +25,8 @@ import {
   SelectTrigger,
   SelectValue,
 } from "@/components/ui/select"
-import {
-  AlertDialog,
-  AlertDialogAction,
-  AlertDialogCancel,
-  AlertDialogContent,
-  AlertDialogDescription,
-  AlertDialogFooter,
-  AlertDialogHeader,
-  AlertDialogTitle,
-} from "@/components/ui/alert-dialog"
 import { Badge } from "@/components/ui/badge"
-import { Plus, Pencil, Trash2, X, Eye } from "lucide-react"
+import { Plus, Pencil, Trash2, X, Eye, ChevronUp } from "lucide-react"
 import { toast } from "sonner"
 
 const DISPLAY_HINT_KINDS: DisplayHintKind[] = ["icon_value", "text_block", "key_value"]
@@ -64,52 +47,72 @@ export function WidgetsPage() {
   const update = useUpdateWidget()
   const del = useDeleteWidget()
 
-  const [editing, setEditing] = useState<Widget | null>(null)
-  const [deleting, setDeleting] = useState<number | null>(null)
-  const [previewing, setPreviewing] = useState<number | null>(null)
+  const [editingId, setEditingId] = useState<number | null>(null)
+  const [editingData, setEditingData] = useState<Widget | null>(null)
+  const [newWidget, setNewWidget] = useState<Widget | null>(null)
+  const [confirmingDelete, setConfirmingDelete] = useState<number | null>(null)
+  const [previewingId, setPreviewingId] = useState<number | null>(null)
 
   function openNew() {
     const nextId =
       widgets.length > 0 ? Math.max(...widgets.map((w) => w.id)) + 1 : 1
-    setEditing({
-      ...EMPTY,
-      id: nextId,
-      data_source_id: sources[0]?.id ?? 0,
-    })
+    setNewWidget({ ...EMPTY, id: nextId, data_source_id: sources[0]?.id ?? 0 })
+    setEditingId(null)
   }
 
-  async function save() {
-    if (!editing) return
-    const isNew = !widgets.some((w) => w.id === editing.id)
+  function startEdit(w: Widget) {
+    setEditingId(w.id)
+    setEditingData({ ...w })
+    setNewWidget(null)
+  }
+
+  function cancelEdit() {
+    setEditingId(null)
+    setEditingData(null)
+    setNewWidget(null)
+  }
+
+  async function saveExisting() {
+    if (!editingData) return
     try {
-      if (isNew) {
-        await create.mutateAsync(editing)
-        toast.success("Widget created")
-      } else {
-        await update.mutateAsync(editing)
-        toast.success("Widget updated")
-      }
-      setEditing(null)
+      await update.mutateAsync(editingData)
+      toast.success("Widget updated")
+      setEditingId(null)
+      setEditingData(null)
     } catch (e) {
       toast.error(String(e))
     }
   }
 
-  async function confirmDelete() {
-    if (deleting == null) return
+  async function saveNew() {
+    if (!newWidget) return
     try {
-      await del.mutateAsync(deleting)
+      await create.mutateAsync(newWidget)
+      toast.success("Widget created")
+      setNewWidget(null)
+    } catch (e) {
+      toast.error(String(e))
+    }
+  }
+
+  async function confirmDelete(id: number) {
+    try {
+      await del.mutateAsync(id)
       toast.success("Widget deleted")
     } catch (e) {
       toast.error(String(e))
     }
-    setDeleting(null)
+    setConfirmingDelete(null)
+  }
+
+  function togglePreview(id: number) {
+    setPreviewingId(previewingId === id ? null : id)
   }
 
   const sourceName = (id: number) =>
     sources.find((s) => s.id === id)?.name ?? `#${id}`
 
-  if (isLoading) return <div className="text-muted-foreground p-4">Loading…</div>
+  if (isLoading) return <div className="text-muted-foreground p-4">Loading...</div>
 
   return (
     <div className="space-y-6">
@@ -120,21 +123,42 @@ export function WidgetsPage() {
             Display primitives bound to data sources
           </p>
         </div>
-        <Button onClick={openNew}>
+        <Button onClick={openNew} disabled={!!newWidget}>
           <Plus className="mr-2 h-4 w-4" />
           Add Widget
         </Button>
       </div>
 
-      {widgets.length === 0 ? (
-        <Card>
-          <CardContent className="py-12 text-center">
-            <p className="text-muted-foreground">No widgets configured yet.</p>
-          </CardContent>
-        </Card>
-      ) : (
-        <div className="grid gap-3">
-          {widgets.map((w) => (
+      <div className="grid gap-3">
+        {newWidget && (
+          <Card className="border-primary">
+            <CardHeader className="py-3">
+              <CardTitle className="text-base">New Widget</CardTitle>
+            </CardHeader>
+            <CardContent className="space-y-4">
+              <WidgetForm value={newWidget} onChange={setNewWidget} sources={sources} />
+              <div className="flex gap-2 justify-end">
+                <Button variant="outline" size="sm" onClick={cancelEdit}>Cancel</Button>
+                <Button size="sm" onClick={saveNew} disabled={!newWidget.name || !newWidget.data_source_id}>Save</Button>
+              </div>
+            </CardContent>
+          </Card>
+        )}
+
+        {widgets.length === 0 && !newWidget && (
+          <Card>
+            <CardContent className="py-12 text-center">
+              <p className="text-muted-foreground">No widgets configured yet.</p>
+            </CardContent>
+          </Card>
+        )}
+
+        {widgets.map((w) => {
+          const isEditing = editingId === w.id
+          const isDeleting = confirmingDelete === w.id
+          const isPreviewing = previewingId === w.id
+
+          return (
             <Card key={w.id}>
               <CardHeader className="flex flex-row items-center justify-between py-3">
                 <div className="space-y-1">
@@ -142,143 +166,65 @@ export function WidgetsPage() {
                   <CardDescription className="flex items-center gap-2">
                     <Badge variant="secondary">{w.display_hint.kind}</Badge>
                     <span>source: {sourceName(w.data_source_id)}</span>
-                    <span>{w.mappings.length} mapping(s)</span>
+                    {w.mappings.length > 0 && <span>{w.mappings.length} mapping(s)</span>}
                   </CardDescription>
                 </div>
                 <div className="flex gap-1">
-                  <Button
-                    variant="ghost"
-                    size="icon"
-                    onClick={() => setPreviewing(w.id)}
-                    title="Preview current data"
-                  >
-                    <Eye className="h-4 w-4" />
+                  <Button variant="ghost" size="icon" onClick={() => togglePreview(w.id)} title="Preview data">
+                    {isPreviewing ? <ChevronUp className="h-4 w-4" /> : <Eye className="h-4 w-4" />}
                   </Button>
-                  <Button
-                    variant="ghost"
-                    size="icon"
-                    onClick={() => setEditing({ ...w })}
-                  >
-                    <Pencil className="h-4 w-4" />
+                  <Button variant="ghost" size="icon" onClick={() => isEditing ? cancelEdit() : startEdit(w)}>
+                    {isEditing ? <ChevronUp className="h-4 w-4" /> : <Pencil className="h-4 w-4" />}
                   </Button>
-                  <Button
-                    variant="ghost"
-                    size="icon"
-                    onClick={() => setDeleting(w.id)}
-                  >
+                  <Button variant="ghost" size="icon" onClick={() => setConfirmingDelete(isDeleting ? null : w.id)}>
                     <Trash2 className="h-4 w-4" />
                   </Button>
                 </div>
               </CardHeader>
+
+              {isDeleting && (
+                <CardContent className="pt-0">
+                  <div className="flex gap-2 items-center p-2 bg-destructive/10 rounded">
+                    <span className="text-sm flex-1">Delete this widget? Layout references will become dangling.</span>
+                    <Button size="sm" variant="destructive" onClick={() => confirmDelete(w.id)}>Delete</Button>
+                    <Button size="sm" variant="ghost" onClick={() => setConfirmingDelete(null)}>Cancel</Button>
+                  </div>
+                </CardContent>
+              )}
+
+              {isPreviewing && !isEditing && (
+                <CardContent className="pt-0">
+                  <WidgetPreviewInline widgetId={w.id} />
+                </CardContent>
+              )}
+
+              {isEditing && editingData && (
+                <CardContent className="space-y-4 pt-0">
+                  <WidgetForm value={editingData} onChange={setEditingData} sources={sources} />
+                  <div className="flex gap-2 justify-end">
+                    <Button variant="outline" size="sm" onClick={cancelEdit}>Cancel</Button>
+                    <Button size="sm" onClick={saveExisting} disabled={!editingData.name || !editingData.data_source_id}>Save</Button>
+                  </div>
+                </CardContent>
+              )}
             </Card>
-          ))}
-        </div>
-      )}
-
-      <Dialog open={!!editing} onOpenChange={(o) => !o && setEditing(null)}>
-        <DialogContent className="max-w-lg">
-          <DialogHeader>
-            <DialogTitle>
-              {editing && widgets.some((w) => w.id === editing.id)
-                ? "Edit Widget"
-                : "New Widget"}
-            </DialogTitle>
-          </DialogHeader>
-          {editing && (
-            <WidgetForm
-              value={editing}
-              onChange={setEditing}
-              sources={sources}
-            />
-          )}
-          <DialogFooter>
-            <Button variant="outline" onClick={() => setEditing(null)}>
-              Cancel
-            </Button>
-            <Button
-              onClick={save}
-              disabled={
-                !editing?.name ||
-                !editing.data_source_id
-              }
-            >
-              Save
-            </Button>
-          </DialogFooter>
-        </DialogContent>
-      </Dialog>
-
-      <AlertDialog
-        open={deleting != null}
-        onOpenChange={(o) => !o && setDeleting(null)}
-      >
-        <AlertDialogContent>
-          <AlertDialogHeader>
-            <AlertDialogTitle>Delete widget?</AlertDialogTitle>
-            <AlertDialogDescription>
-              This will permanently remove this widget. Layout references will
-              become dangling.
-            </AlertDialogDescription>
-          </AlertDialogHeader>
-          <AlertDialogFooter>
-            <AlertDialogCancel>Cancel</AlertDialogCancel>
-            <AlertDialogAction onClick={confirmDelete}>
-              Delete
-            </AlertDialogAction>
-          </AlertDialogFooter>
-        </AlertDialogContent>
-      </AlertDialog>
-
-      {previewing != null && (
-        <WidgetPreviewDialog
-          widgetId={previewing}
-          widgetName={widgets.find((w) => w.id === previewing)?.name ?? ""}
-          onClose={() => setPreviewing(null)}
-        />
-      )}
+          )
+        })}
+      </div>
     </div>
   )
 }
 
-function WidgetPreviewDialog({
-  widgetId,
-  widgetName,
-  onClose,
-}: {
-  widgetId: number
-  widgetName: string
-  onClose: () => void
-}) {
+function WidgetPreviewInline({ widgetId }: { widgetId: number }) {
   const { data, isLoading, isError } = useWidgetPreview(widgetId, true)
 
+  if (isLoading) return <p className="text-muted-foreground text-sm">Loading...</p>
+  if (isError) return <p className="text-muted-foreground text-sm">No data yet</p>
+
   return (
-    <Dialog open onOpenChange={(o) => !o && onClose()}>
-      <DialogContent>
-        <DialogHeader>
-          <DialogTitle>Preview: {widgetName}</DialogTitle>
-        </DialogHeader>
-        <div className="py-2">
-          {isLoading && (
-            <p className="text-muted-foreground text-sm">Loading…</p>
-          )}
-          {isError && (
-            <p className="text-muted-foreground text-sm">
-              No data yet — widget hasn't been polled
-            </p>
-          )}
-          {data && (
-            <pre className="bg-muted rounded-md p-3 text-xs">
-              {JSON.stringify(data, null, 2)}
-            </pre>
-          )}
-        </div>
-        <DialogFooter>
-          <Button variant="outline" onClick={onClose}>
-            Close
-          </Button>
-        </DialogFooter>
-      </DialogContent>
-    </Dialog>
+    <pre className="bg-muted rounded-md p-3 text-xs">
+      {JSON.stringify(data, null, 2)}
+    </pre>
   )
 }
 
@@ -312,7 +258,7 @@ function WidgetForm({
   }
 
   return (
-    <div className="grid gap-4 py-2">
+    <div className="grid gap-4">
       <div className="grid gap-2">
         <Label>Name</Label>
         <Input
@@ -327,14 +273,10 @@ function WidgetForm({
           value={value.display_hint.kind}
           onValueChange={(v) => set("display_hint", { ...value.display_hint, kind: v as DisplayHintKind })}
         >
-          <SelectTrigger>
-            <SelectValue />
-          </SelectTrigger>
+          <SelectTrigger><SelectValue /></SelectTrigger>
           <SelectContent>
             {DISPLAY_HINT_KINDS.map((h) => (
-              <SelectItem key={h} value={h}>
-                {h}
-              </SelectItem>
+              <SelectItem key={h} value={h}>{h}</SelectItem>
             ))}
           </SelectContent>
         </Select>
@@ -346,9 +288,7 @@ function WidgetForm({
             value={value.display_hint.h_align}
             onValueChange={(v) => set("display_hint", { ...value.display_hint, h_align: v as HAlign })}
           >
-            <SelectTrigger>
-              <SelectValue />
-            </SelectTrigger>
+            <SelectTrigger><SelectValue /></SelectTrigger>
             <SelectContent>
               <SelectItem value="left">Left</SelectItem>
               <SelectItem value="center">Center</SelectItem>
@@ -362,9 +302,7 @@ function WidgetForm({
             value={value.display_hint.v_align}
             onValueChange={(v) => set("display_hint", { ...value.display_hint, v_align: v as VAlign })}
           >
-            <SelectTrigger>
-              <SelectValue />
-            </SelectTrigger>
+            <SelectTrigger><SelectValue /></SelectTrigger>
             <SelectContent>
               <SelectItem value="top">Top</SelectItem>
               <SelectItem value="middle">Middle</SelectItem>
@@ -379,14 +317,10 @@ function WidgetForm({
           value={String(value.data_source_id)}
           onValueChange={(v) => set("data_source_id", Number(v))}
         >
-          <SelectTrigger>
-            <SelectValue />
-          </SelectTrigger>
+          <SelectTrigger><SelectValue /></SelectTrigger>
           <SelectContent>
             {sources.map((s) => (
-              <SelectItem key={s.id} value={String(s.id)}>
-                {s.name}
-              </SelectItem>
+              <SelectItem key={s.id} value={String(s.id)}>{s.name}</SelectItem>
             ))}
           </SelectContent>
         </Select>
@@ -412,26 +346,18 @@ function WidgetForm({
           <div key={i} className="flex items-center gap-2">
             <Input
               value={m.source_path}
-              onChange={(e) =>
-                updateMapping(i, { ...m, source_path: e.target.value })
-              }
+              onChange={(e) => updateMapping(i, { ...m, source_path: e.target.value })}
               placeholder="$.path.to.value"
               className="flex-1"
             />
-            <span className="text-muted-foreground text-sm">→</span>
+            <span className="text-muted-foreground text-sm">&rarr;</span>
             <Input
               value={m.target_key}
-              onChange={(e) =>
-                updateMapping(i, { ...m, target_key: e.target.value })
-              }
+              onChange={(e) => updateMapping(i, { ...m, target_key: e.target.value })}
               placeholder="target_key"
               className="flex-1"
             />
-            <Button
-              variant="ghost"
-              size="icon"
-              onClick={() => removeMapping(i)}
-            >
+            <Button variant="ghost" size="icon" onClick={() => removeMapping(i)}>
               <X className="h-3 w-3" />
             </Button>
           </div>