feat(library): add sqlite-backed library sync and stats

BREAKING CHANGE: Library data is now stored in a database and will require an initial sync. Existing in-memory library data is no longer used.

src-tauri/Cargo.toml

@@ -26,5 +26,5 @@ tauri-plugin-fs = "2"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 tauri-plugin-http = { version = "2", features = ["unsafe-headers"] }
-tauri-plugin-sql = "2"
+tauri-plugin-sql = { version = "2", features = ["sqlite"] }