Feature/image preview zoom - #104
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$matches 是 PowerShell 内置自动变量（存储正则匹配结果）， 赋值会导致不可预期副作用。改为 $matchedLines。
## 修复了哪些问题 1. **编辑器光标不闪烁**： - TabContent 新增 caret_visible 字段，控制光标可见状态 - 点击编辑器区域时启动 CARET_TIMER_ID 定时器（530ms 周期） - on_timer_caret 中新增编辑器光标闪烁逻辑，与 AI 面板/沙盒输入框统一处理 - render_editor 中根据 caret_visible 决定是否绘制光标，实现闪烁效果 2. **文件树单击手感**： - 确认文件树已是单击打开（非双击），handle_file_tree_click 中 FileKind::File 直接打开 - 拖拽检测阈值保持 4px，避免误触发 ## 极致性能设计 - 光标闪烁使用脏矩形标记，只重绘 EditorContent 区域（非全窗口） - 定时器只在需要时启动（点击编辑器/输入框时），无输入时自动停止 - 与现有脏矩形追踪系统整合，不引入额外渲染开销
- 添加 Ctrl+滚轮缩放图片（10%-1000%） - 添加 Ctrl+= / Ctrl+- 快捷键缩放 - 添加 Ctrl+0 重置缩放 - 信息栏显示当前缩放比例 - 添加图片渲染裁剪，防止溢出编辑区域 - 添加鼠标中键拖拽平移功能 - 切换图片/标签时自动重置缩放状态
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变更内容
更新了哪些特性
修复了哪些问题
其他说明
本次更新为图片预览功能添加了完整的缩放和平移能力，用户可以：
切换图片或标签时会自动重置缩放状态，确保每次打开图片都从 100% 开始。