Add feedback service, reminder diagnostics and smooth week transitions

mobile/lib/features/profile/profile_page.dart

@@ -6,7 +6,10 @@ import 'package:flutter/material.dart';
 
 import '../../app/app_controller.dart';
 import '../../app/app_theme.dart';
+import '../../app/app_version.dart';
 import '../../data/schedule_file_import.dart';
+import '../feedback/feedback_page.dart';
+import '../feedback/feedback_submission.dart';
 import 'settings_page.dart';
 import 'import_preview.dart';
 
@@ -19,12 +22,14 @@ class ProfilePage extends StatelessWidget {
     this.onLogout,
     this.logoutLabel = '退出学校登录',
     this.onUpdateTerm,
+    this.feedbackSender = const UnconfiguredFeedbackSender(),
   });
   final AppController controller;
   final VoidCallback onLogin;
   final VoidCallback? onLogout;
   final VoidCallback? onUpdateTerm;
   final String authStatus, logoutLabel;
+  final FeedbackSender feedbackSender;
   Future<void> _import(BuildContext context) async {
     try {
       final file = await FilePicker.pickFile(
@@ -212,6 +217,18 @@ class ProfilePage extends StatelessWidget {
                 '无需登录，预览课表样式',
                 controller.showDemo,
               ),
+              Divider(height: 1, color: ink.withValues(alpha: 0.06)),
+              _tile(
+                Icons.chat_bubble_outline_rounded,
+                '反馈与共建',
+                '反馈问题和建议 · 我要参与开发',
+                () => Navigator.push(
+                  context,
+                  MaterialPageRoute<void>(
+                    builder: (_) => FeedbackPage(sender: feedbackSender),
+                  ),
+                ),
+              ),
             ],
           ),
         ),
@@ -224,6 +241,14 @@ class ProfilePage extends StatelessWidget {
                 style: TextStyle(fontSize: 13, fontWeight: FontWeight.w600),
               ),
               const SizedBox(height: 6),
+              Text(
+                '版本 $appVersion',
+                style: TextStyle(
+                  fontSize: 11,
+                  color: ink.withValues(alpha: 0.45),
+                ),
+              ),
+              const SizedBox(height: 6),
               Text(
                 '今天也有值得期待的小事。',
                 style: TextStyle(