Merge branch 'claude/kind-darwin-906785' into main

升级 flutter_markdown → flutter_markdown_plus，重写笔记编辑器界面

lib/pages/note/note_detail_page.dart

@@ -1,6 +1,6 @@
 import 'dart:io';
 import 'package:flutter/material.dart';
-import 'package:flutter_markdown/flutter_markdown.dart';
+import 'package:flutter_markdown_plus/flutter_markdown_plus.dart';
 import 'package:provider/provider.dart';
 import '../../providers/app_provider.dart';
 import '../../models/data_models.dart';