feat(ui):增加设置主题成功后通知watch刷新

@@ -190,27 +190,27 @@ class WatchThemePreviewController extends GetxController {
       }
     }
 
-    var syncSuccess = false;
     try {
       final result = await _themeApi.applyTheme(themeId);
       if (result is! AppSuccess<void>) {
-        syncSuccess =
-            await AppWearEngineHostApi().syncWatchTheme(downloadedTheme);
-        isApplying.value = false;
         AppToast.show(l10n.watchThemeApplyFailed);
         return false;
       }
+
+      final syncSuccess =
+          await WearEngineHostApi().syncWatchTheme(downloadedTheme);
+      if (!syncSuccess) {
+        AppToast.show(l10n.watchThemeWatchSyncFailed);
+        return false;
+      }
+
       selectedThemeItem.value = themeItem;
-      isApplying.value = false;
       return true;
     } catch (_) {
-      // The active theme is already saved on the server.
-      syncSuccess = false;
-    }
-    isApplying.value = false;
-    if (!syncSuccess) {
-      AppToast.show(l10n.watchThemeWatchSyncFailed);
+      AppToast.show(l10n.watchThemeApplyFailed);
+      return false;
+    } finally {
+      isApplying.value = false;
     }
-    return syncSuccess;
   }
 }