opt.: display err if home widget fails (#659)

lib/core/chan.dart

@@ -0,0 +1,25 @@
+import 'package:flutter/services.dart';
+import 'package:server_box/data/res/misc.dart';
+
+abstract final class MethodChans {
+  static const _channel = MethodChannel('${Miscs.pkgName}/main_chan');
+
+  static void moveToBg() {
+    _channel.invokeMethod('sendToBackground');
+  }
+
+  /// TODO: try fix the fn, then uncomment it and [stopService]
+  /// Issues #639
+  static void startService() {
+    // _channel.invokeMethod('startService');
+  }
+
+  static void stopService() {
+    // _channel.invokeMethod('stopService');
+  }
+
+  static void updateHomeWidget() async {
+    //if (!Stores.setting.autoUpdateHomeWidget.fetch()) return;
+    await _channel.invokeMethod('updateHomeWidget');
+  }
+}