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

mobile/lib/features/timetable/timetable_page.dart

@@ -33,57 +33,23 @@ class _TimetablePageState extends State<TimetablePage> {
     final sunday = monday.add(const Duration(days: 6));
     return ListView(
       padding: EdgeInsets.fromLTRB(
-        18,
-        20,
-        18,
+        8,
+        10,
+        8,
         140 + MediaQuery.paddingOf(context).bottom,
       ),
       children: [
-        Text(
-          'HEPAN  /  EVERYDAY',
+        const Text(
+          'Riverside Schedule',
           style: TextStyle(
-            fontSize: 10,
-            letterSpacing: 2.2,
-            color: river.withValues(alpha: 0.8),
+            fontSize: 22,
             fontWeight: FontWeight.w700,
+            letterSpacing: -0.5,
           ),
         ),
-        const SizedBox(height: 9),
-        Row(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            const Expanded(
-              child: Text(
-                '每一天，\n从容一点。',
-                style: TextStyle(
-                  fontSize: 27,
-                  fontWeight: FontWeight.w700,
-                  height: 1.3,
-                  letterSpacing: -0.6,
-                ),
-              ),
-            ),
-            Container(
-              margin: const EdgeInsets.only(top: 5),
-              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 9),
-              decoration: BoxDecoration(
-                color: Colors.white,
-                borderRadius: BorderRadius.circular(16),
-              ),
-              child: Text(
-                '${today.month} 月 ${today.day} 日',
-                style: const TextStyle(
-                  fontSize: 12,
-                  fontWeight: FontWeight.w600,
-                  color: river,
-                ),
-              ),
-            ),
-          ],
-        ),
-        const SizedBox(height: 22),
+        const SizedBox(height: 10),
         SurfaceCard(
-          padding: const EdgeInsets.symmetric(horizontal: 9, vertical: 12),
+          padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 0),
           child: Row(
             children: [
               IconButton(
@@ -126,7 +92,7 @@ class _TimetablePageState extends State<TimetablePage> {
             ],
           ),
         ),
-        const SizedBox(height: 14),
+        const SizedBox(height: 4),
         if (c.isDemo)
           Padding(
             padding: const EdgeInsets.only(bottom: 12),
@@ -172,7 +138,7 @@ class _TimetablePageState extends State<TimetablePage> {
           ),
           const SizedBox(height: 12),
           Text(
-            '左右滑动查看整周 · 点击课程查看详情',
+            '点击课程查看完整信息',
             textAlign: TextAlign.center,
             style: TextStyle(fontSize: 11, color: ink.withValues(alpha: 0.35)),
           ),
@@ -191,7 +157,7 @@ class _TimetablePageState extends State<TimetablePage> {
           ),
           const SizedBox(height: 12),
           Text(
-            '在「我的」设置学期并导入课程，\n或先看看河畔的示例课表。',
+            '在「我的」设置学期并导入课程，\n或先看看示例课表。',
             textAlign: TextAlign.center,
             style: TextStyle(
               fontSize: 13,