feat: add server time to obsidian connect responses and enhance error handling

- Included server_time_utc in the connect response schema for better synchronization.
- Updated obsidian_connect function to set server_time_utc during connection handling.
- Enhanced integration tests to verify the presence of server_time_utc in responses.
- Improved connectivity status recovery in the sync engine for better error management.

surfsense_obsidian/src/main.ts

@@ -149,6 +149,7 @@ export default class SurfSensePlugin extends Plugin {
 		});
 
 		const onNetChange = () => {
+			void this.engine.recoverConnectivityStatus();
 			if (this.shouldAutoSync()) void this.engine.flushQueue();
 		};
 		this.registerDomEvent(window, "online", onNetChange);