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/capabilities/default.json

@@ -55,6 +55,7 @@
         }
       ]
     },
-    "sql:default"
+    "sql:default",
+    "sql:allow-execute"
   ]
 }