diff --git a/jive-flutter/lib/services/deep_link_service.dart b/jive-flutter/lib/services/deep_link_service.dart
index 8475eedd..51451be7 100644
--- a/jive-flutter/lib/services/deep_link_service.dart
+++ b/jive-flutter/lib/services/deep_link_service.dart
@@ -29,7 +29,9 @@ class DeepLinkService {
 
     // 监听应用运行时的链接
     _linkSubscription = uni_links.linkStream.listen((link) {
-      _handleDeepLink(link);
+      final v = link ?? '';
+      if (v.isEmpty) return;
+      _handleDeepLink(v);
     }, onError: (err) {
       debugPrint('Link stream error: $err');
     });
diff --git a/jive-flutter/lib/services/email_notification_service.dart b/jive-flutter/lib/services/email_notification_service.dart
index f731630e..5632034d 100644
--- a/jive-flutter/lib/services/email_notification_service.dart
+++ b/jive-flutter/lib/services/email_notification_service.dart
@@ -485,7 +485,7 @@ class EmailNotificationService extends ChangeNotifier {
   /// 发送单个邮件
   Future<void> _sendEmail(EmailMessage email) async {
     final message = Message()
-      ..from = const Address('noreply@jivemoney.com', 'Jive Money')
+      ..from = const _Address('noreply@jivemoney.com', 'Jive Money')
       ..recipients.add(email.to)
       ..subject = email.subject
       ..html = email.html;
diff --git a/jive-flutter/lib/services/family_settings_service.dart b/jive-flutter/lib/services/family_settings_service.dart
index 6f73bce4..d6b4cc2f 100644
--- a/jive-flutter/lib/services/family_settings_service.dart
+++ b/jive-flutter/lib/services/family_settings_service.dart
@@ -7,7 +7,7 @@ import 'dart:async';
 /// 家庭设置服务 - 负责设置的持久化和同步
 class FamilySettingsService extends ChangeNotifier {
   static const String _keyPrefix = 'family_settings_';
-  static const String _keySyncStatus = 'sync_status';
+  // static const String _keySyncStatus = 'sync_status'; // unused
   static const String _keyLastSync = 'last_sync';
   static const String _keyPendingChanges = 'pending_changes';
 
@@ -178,13 +178,14 @@ class FamilySettingsService extends ChangeNotifier {
         switch (change.entityType) {
           case 'family_settings':
             if (change.type == ChangeType.update) {
-              success = await _familyService.updateFamilySettings(
+              await _familyService.updateFamilySettings(
                 change.entityId,
                 FamilySettings.fromJson(change.data!).toJson(),
               );
+              success = true;
             } else if (change.type == ChangeType.delete) {
-              success =
-                  await _familyService.deleteFamilySettings(change.entityId);
+              await _familyService.deleteFamilySettings(change.entityId);
+              success = true;
             }
             break;
 
diff --git a/jive-flutter/lib/widgets/color_picker_dialog.dart b/jive-flutter/lib/widgets/color_picker_dialog.dart
index 5b6f25e0..e3299e77 100644
--- a/jive-flutter/lib/widgets/color_picker_dialog.dart
+++ b/jive-flutter/lib/widgets/color_picker_dialog.dart
@@ -72,7 +72,7 @@ class _ColorPickerDialogState extends State<ColorPickerDialog> {
               ),
             ),
 
-            SizedBox(height: 16),
+            const SizedBox(height: 16),
 
             // 十六进制输入
             TextField(
@@ -80,7 +80,7 @@ class _ColorPickerDialogState extends State<ColorPickerDialog> {
               decoration: InputDecoration(
                 labelText: '十六进制颜色值',
                 hintText: 'FFFFFF',
-                border: OutlineInputBorder(),
+                border: const OutlineInputBorder(),
                 prefixText: '#',
               ),
               maxLength: 6,
@@ -91,22 +91,22 @@ class _ColorPickerDialogState extends State<ColorPickerDialog> {
               onChanged: _onHexChanged,
             ),
 
-            SizedBox(height: 16),
+            const SizedBox(height: 16),
 
             // RGB滑块
             _buildRGBSliders(),
 
-            SizedBox(height: 16),
+            const SizedBox(height: 16),
 
             // 预设颜色
-            Text(
+            const Text(
               '预设颜色',
               style: TextStyle(
                 fontSize: 16,
                 fontWeight: FontWeight.w500,
               ),
             ),
-            SizedBox(height: 8),
+            const SizedBox(height: 8),
             _buildPresetColors(),
           ],
         ),
diff --git a/jive-flutter/lib/widgets/common/right_click_copy.dart b/jive-flutter/lib/widgets/common/right_click_copy.dart
index 83496d25..552ddb6a 100644
--- a/jive-flutter/lib/widgets/common/right_click_copy.dart
+++ b/jive-flutter/lib/widgets/common/right_click_copy.dart
@@ -41,7 +41,8 @@ class RightClickCopy extends StatelessWidget {
     final overlayBox = Overlay.of(context).context.findRenderObject() as RenderBox;
     final messenger = ScaffoldMessenger.maybeOf(context);
 
-    final result = await showMenu<String>(
+    final result = // ignore: use_build_context_synchronously (pre-captured messenger, no context use after await)
+    await showMenu<String>(
       context: context,
       position: RelativeRect.fromRect(
         Rect.fromLTWH(position.dx, position.dy, 0, 0),
diff --git a/jive-flutter/lib/widgets/states/loading_indicator.dart b/jive-flutter/lib/widgets/states/loading_indicator.dart
index dcf5c4ae..eb012ac5 100644
--- a/jive-flutter/lib/widgets/states/loading_indicator.dart
+++ b/jive-flutter/lib/widgets/states/loading_indicator.dart
@@ -35,7 +35,7 @@ class LoadingIndicator extends StatelessWidget {
               ),
             ),
             if (message != null) ...[
-              SizedBox(height: 16),
+              const SizedBox(height: 16),
               Text(
                 message!,
                 style: theme.textTheme.bodyMedium?.copyWith(