Fix warnings and update tracability

src/lib/services/syncService.ts

@@ -38,6 +38,20 @@ export type SyncOperation =
  * for queueing and managing sync operations.
  */
 class SyncService {
+  /**
+   * Start the sync service (lifecycle managed by Rust backend)
+   */
+  start(): void {
+    console.log("[SyncService] Started");
+  }
+
+  /**
+   * Stop the sync service (lifecycle managed by Rust backend)
+   */
+  stop(): void {
+    console.log("[SyncService] Stopped");
+  }
+
   /**
    * Queue a mutation for sync to server
    *