feat: deliver Riverside Schedule seven-day grid and school HTML import

mobile/lib/features/profile/profile_page.dart

@@ -6,7 +6,7 @@ import 'package:flutter/material.dart';
 
 import '../../app/app_controller.dart';
 import '../../app/app_theme.dart';
-import '../../data/json_schedule_import.dart';
+import '../../data/schedule_file_import.dart';
 import 'settings_page.dart';
 import 'import_preview.dart';
 
@@ -26,7 +26,7 @@ class ProfilePage extends StatelessWidget {
     try {
       final file = await FilePicker.pickFile(
         type: FileType.custom,
-        allowedExtensions: ['json'],
+        allowedExtensions: ['json', 'html', 'htm'],
       );
       if (file == null) return;
       final bytes = BytesBuilder(copy: false);
@@ -38,7 +38,7 @@ class ProfilePage extends StatelessWidget {
         }
         bytes.add(chunk);
       }
-      final draft = JsonScheduleImport.parse(utf8.decode(bytes.takeBytes()));
+      final draft = ScheduleFileImport.parse(utf8.decode(bytes.takeBytes()));
       if (!context.mounted) return;
       await showModalBottomSheet<bool>(
         context: context,
@@ -61,31 +61,16 @@ class ProfilePage extends StatelessWidget {
     return ListView(
       padding: EdgeInsets.fromLTRB(
         22,
-        26,
+        10,
         22,
         145 + MediaQuery.paddingOf(context).bottom,
       ),
       children: [
-        Text(
-          'YOUR LITTLE RIVERSIDE',
-          style: TextStyle(
-            fontSize: 10,
-            letterSpacing: 1.8,
-            color: river.withValues(alpha: 0.75),
-            fontWeight: FontWeight.w600,
-          ),
-        ),
-        const SizedBox(height: 10),
         const Text(
-          '我的河畔',
-          style: TextStyle(fontSize: 29, fontWeight: FontWeight.w700),
+          'Riverside Schedule',
+          style: TextStyle(fontSize: 22, fontWeight: FontWeight.w700),
         ),
-        const SizedBox(height: 7),
-        Text(
-          '把时间，留给真正重要的事。',
-          style: TextStyle(fontSize: 13, color: ink.withValues(alpha: 0.5)),
-        ),
-        const SizedBox(height: 26),
+        const SizedBox(height: 16),
         SurfaceCard(
           child: Column(
             crossAxisAlignment: CrossAxisAlignment.start,
@@ -207,14 +192,14 @@ class ProfilePage extends StatelessWidget {
               _tile(
                 Icons.file_download_outlined,
                 '从文件导入',
-                '先预览，再替换课表',
+                '学校 HTML / JSON · 先预览再导入',
                 () => _import(context),
               ),
               Divider(height: 1, color: ink.withValues(alpha: 0.06)),
               _tile(
                 Icons.auto_awesome_outlined,
                 '体验示例课表',
-                '无需登录，看看河畔的样子',
+                '无需登录，预览课表样式',
                 controller.showDemo,
               ),
             ],
@@ -225,7 +210,7 @@ class ProfilePage extends StatelessWidget {
           child: Column(
             children: [
               const Text(
-                '河畔Everyday',
+                'Riverside Schedule',
                 style: TextStyle(fontSize: 13, fontWeight: FontWeight.w600),
               ),
               const SizedBox(height: 6),