fix: 全链路问题修复 — 编辑器返回/Tab导航/数据库编码/Token注入

修复内容:
- 编辑器返回按钮: 所有 context.go('/editor') 改为 context.push()，pop() 加安全守卫 fallback 到 /home
- Tab 导航: Web 平台强制使用移动端底部 TabBar 布局 (kIsWeb 守卫)
- 数据库编码: db.rs 自动追加 client_encoding=utf8 参数，修复中文 display_name 乱码
- AuthBloc token: 清理冗余 TODO，token 注入已在 AuthRepository 中正常工作
- 影响 9 个文件的编辑器导航调用点统一修改

app/lib/features/calendar/views/calendar_page.dart

@@ -385,7 +385,7 @@ class _EmptyDayView extends StatelessWidget {
           ),
           const SizedBox(height: 24),
           FilledButton.tonal(
-            onPressed: () => context.go('/editor'),
+            onPressed: () => context.push('/editor'),
             child: const Text('写一篇'),
           ),
         ],
@@ -420,7 +420,7 @@ class _DayJournalList extends StatelessWidget {
             side: BorderSide(color: colorScheme.outlineVariant),
           ),
           child: InkWell(
-            onTap: () => context.go('/editor?id=${journal.id}'),
+            onTap: () => context.push('/editor?id=${journal.id}'),
             borderRadius: BorderRadius.circular(16),
             child: Padding(
               padding: const EdgeInsets.all(16),

app/lib/features/class_/views/class_page.dart

@@ -296,7 +296,7 @@ class _DiaryWallCard extends StatelessWidget {
         side: BorderSide(color: colorScheme.outlineVariant),
       ),
       child: InkWell(
-        onTap: () => context.go('/editor?id=${journal.id}'),
+        onTap: () => context.push('/editor?id=${journal.id}'),
         borderRadius: BorderRadius.circular(16),
         child: Padding(
           padding: const EdgeInsets.all(16),
@@ -417,7 +417,7 @@ class _TopicsTab extends StatelessWidget {
             side: BorderSide(color: colorScheme.outlineVariant),
           ),
           child: InkWell(
-            onTap: () => context.go('/editor?topic=${topic.id}'),
+            onTap: () => context.push('/editor?topic=${topic.id}'),
             borderRadius: BorderRadius.circular(16),
             child: Padding(
               padding: const EdgeInsets.all(16),

app/lib/features/editor/views/editor_page.dart

@@ -50,7 +50,13 @@ class EditorPage extends StatelessWidget {
       ),
       child: _EditorView(
         journalId: journalId,
-        onSaveComplete: () => context.pop(),
+        onSaveComplete: () {
+          if (context.canPop()) {
+            context.pop();
+          } else {
+            context.go('/home');
+          }
+        },
       ),
     );
   }
@@ -202,7 +208,13 @@ class _EditorView extends StatelessWidget {
         children: [
           // 返回按钮
           IconButton(
-            onPressed: () => context.pop(),
+            onPressed: () {
+              if (context.canPop()) {
+                context.pop();
+              } else {
+                context.go('/home');
+              }
+            },
             icon: const Icon(Icons.arrow_back_rounded),
             tooltip: '返回',
           ),

app/lib/features/home/views/home_page.dart

@@ -173,7 +173,7 @@ class _QuickMoodCard extends StatelessWidget {
               children: moods.map((mood) {
                 final isTop = topMood == mood.$3;
                 return GestureDetector(
-                  onTap: () => context.go('/editor'),
+                  onTap: () => context.push('/editor'),
                   child: Column(
                     children: [
                       Container(
@@ -225,7 +225,7 @@ class _JournalList extends StatelessWidget {
             side: BorderSide(color: colorScheme.outlineVariant),
           ),
           child: InkWell(
-            onTap: () => context.go('/editor?id=${journal.id}'),
+            onTap: () => context.push('/editor?id=${journal.id}'),
             borderRadius: BorderRadius.circular(16),
             child: Padding(
               padding: const EdgeInsets.all(16),
@@ -292,7 +292,7 @@ class _EmptyJournalState extends StatelessWidget {
               style: theme.textTheme.bodyLarge?.copyWith(color: colorScheme.onSurface.withValues(alpha: 0.5))),
             const SizedBox(height: 24),
             FilledButton.icon(
-              onPressed: () => context.go('/editor'),
+              onPressed: () => context.push('/editor'),
               icon: const Icon(Icons.add_rounded),
               label: const Text('写日记'),
             ),

app/lib/features/templates/views/template_gallery_page.dart

@@ -139,7 +139,7 @@ class _TemplateCard extends StatelessWidget {
       child: InkWell(
         onTap: () {
           // 使用模板创建日记
-          context.go('/editor?template=${template.id}');
+          context.push('/editor?template=${template.id}');
         },
         borderRadius: BorderRadius.circular(16),
         child: Padding(