v0.2.0: VSCode内置Diff + QuickPick总览 + EditRecord粒度 + Bug修复

新增:
- VSCode内置Diff编辑器 (diffViewer.ts) 替代Webview,零保存提示
- EditRecord独立追踪: 每次Edit/Write不合并,支持逐次编辑Accept/Reject
- QuickPick文件列表总览,含Accept All / Reject All
- 智能Auto-Advance: Accept/Reject后自动推进,同文件多编辑智能停留
- 状态栏常驻显示  AI Diff,Diff模式下切换为操作按钮

修复:
- Accept后同文件再编辑不触发选项 (pending-priority匹配)
- Accept All / Reject All写入与状态顺序修复
- acceptFile/rejectFile改为先写入成功再标记状态
- 同文件多个FileChange孤儿编辑问题

变更:
- ChangeSetManager重构为EditRecord[] + FileChange聚合
- HookHandler精简,QuickPick移入hookHandler
- 移除InlineDecorator/CodeLens (主流程),ReviewPanel降级为备用
- package.json: publisher=YonHao Guo, repository, v0.2.0, 新配置项/快捷键

测试: 13/13通过 (7 diffEngine + 6 changeSetManager回归)

package.json

@@ -3,7 +3,11 @@
   "displayName": "AI Code Diff Preview",
   "description": "类 Cursor 的 AI 代码差异预览插件，使用 VSCode 内置 Diff 编辑器 + 浮动 Accept/Reject 标签",
   "version": "0.2.0",
-  "publisher": "your-publisher-name",
+  "publisher": "Gmaker689",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/Gmaker689/ai-diff-preview"
+  },
   "engines": {
     "vscode": "^1.85.0"
   },