笔记编辑功能修复

lib/pages/note/note_detail_page.dart

@@ -12,6 +12,7 @@ import '../../utils/toast_util.dart';
 import '../../utils/image_path_helper.dart';
 import '../../utils/responsive.dart';
 import '../../widgets/vditor_editor.dart';
+import '../../widgets/tag_side_panel.dart';
 import 'note_share_page.dart';
 
 /// 笔记详情页
@@ -444,7 +445,6 @@ class _NoteDetailPageState extends State<NoteDetailPage> {
       // 标题输入
       Container(
         padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
-        decoration: BoxDecoration(border: Border(bottom: BorderSide(color: colors.outlineVariant, width: 0.5))),
         child: Center(child: ConstrainedBox(constraints: const BoxConstraints(maxWidth: 720),
           child: TextField(controller: _titleCtrl, maxLines: 1,
             style: TextStyle(fontSize: 16, fontWeight: FontWeight.w700, color: colors.onSurface, height: 1.4),
@@ -454,6 +454,13 @@ class _NoteDetailPageState extends State<NoteDetailPage> {
             onChanged: (_) => setState(() {})),
         )),
       ),
+      // 标签行 — 标题下面，靠左
+      Container(
+        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 6),
+        child: Center(child: ConstrainedBox(constraints: const BoxConstraints(maxWidth: 720),
+          child: Align(alignment: Alignment.centerLeft, child: _buildEditTagRow(colors)),
+        )),
+      ),
       // 内容编辑
       Expanded(
         child: VditorEditor(
@@ -480,6 +487,64 @@ class _NoteDetailPageState extends State<NoteDetailPage> {
     ]);
   }
 
+  Widget _buildEditTagRow(ColorScheme colors) {
+    return Wrap(
+      spacing: 6,
+      runSpacing: 4,
+      children: [
+        for (final tag in _editTags)
+          Container(
+            padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
+            decoration: BoxDecoration(
+              color: colors.surfaceContainerHighest,
+              borderRadius: BorderRadius.circular(6),
+            ),
+            child: Row(mainAxisSize: MainAxisSize.min, children: [
+              Text(tag, style: TextStyle(fontSize: 11, color: colors.onSurface.withValues(alpha: 0.6))),
+              const SizedBox(width: 3),
+              GestureDetector(
+                onTap: () => setState(() => _editTags.remove(tag)),
+                child: Icon(Icons.close, size: 10, color: colors.onSurface.withValues(alpha: 0.3)),
+              ),
+            ]),
+          ),
+        GestureDetector(
+          onTap: _showEditTagPanel,
+          child: Container(
+            padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
+            decoration: BoxDecoration(
+              borderRadius: BorderRadius.circular(6),
+              border: Border.all(color: colors.onSurface.withValues(alpha: 0.25), width: 1),
+            ),
+            child: Row(mainAxisSize: MainAxisSize.min, children: [
+              Icon(Icons.add, size: 12, color: colors.onSurface.withValues(alpha: 0.35)),
+              const SizedBox(width: 2),
+              Text('标签', style: TextStyle(fontSize: 11, color: colors.onSurface.withValues(alpha: 0.35))),
+            ]),
+          ),
+        ),
+      ],
+    );
+  }
+
+  Future<void> _showEditTagPanel() async {
+    final provider = context.read<AppProvider>();
+    final tagRows = await provider.getTags('note_tag');
+    final allTags = tagRows.map((t) => t['name'] as String).toSet();
+    for (final note in provider.notes) {
+      allTags.addAll(note.tags);
+    }
+    if (!mounted) return;
+    TagSidePanel.show(
+      context: context,
+      selectedTags: List.from(_editTags),
+      allAvailableTags: allTags.toList()..sort(),
+      onTagsChanged: (newTags) {
+        setState(() => _editTags = newTags);
+      },
+    );
+  }
+
   Widget _buildPreviewArea(ColorScheme colors, Note note) {
     return ListView(
       padding: const EdgeInsets.symmetric(vertical: 24),