refactor (v2): better arch

Co-authored-by: Copilot <copilot@github.com>

crates/application/src/lib.rs

@@ -0,0 +1,10 @@
+pub mod auth;
+pub mod config;
+pub mod context;
+pub mod notes;
+pub mod smart;
+pub mod tags;
+pub mod worker;
+
+#[cfg(test)]
+pub(crate) mod test_helpers;