Piston Scanner

# 更新日志 / Changelog — v3.0 → v4.0.0
## 新功能 / New Features
### 红石储存库文件夹系统 / Redstone Repository Folder System
- 新增文件夹管理：可新建、重命名、移动方块至文件夹
- 收藏夹文件夹不可删除
- 文件夹数量实时显示其中的方块数
- Added folder management: create, rename, move blocks into folders
- Favorite folder is protected from deletion
- Folder counts reflect real-time block count
### 扁平列表 & 搜索 / Flat List & Search
- 移除旧的分类树结构，改为按方块名称分组的扁平列表
- 新增搜索框，支持按方块名称、坐标、维度搜索
- 搜索状态在 GUI 关闭/重开后持久化保留
- Removed the old category tree structure; replaced with a flat list grouped by block name
- Added search bar supporting name, coordinate, and dimension lookup
- Search state persists across GUI open/close cycles
### 键盘滚动 / Keyboard Scrolling
- 方向键↑↓滚动一行，Page Up/Down 滚动一屏，Home/End 跳到首尾
- Arrow keys ↑↓ scroll one row, Page Up/Down scroll one screen, Home/End jump to top/bottom
### 可视化滚动条 / Visual Scrollbar
- 列表右侧新增滚动条，滑块位置指示当前浏览位置
- Added a scrollbar on the right side of the list, showing current scroll position