KyteShelf: download ældre versioner

[修復與穩定性] 修復從網頁瀏覽器拖曳圖片時因 OLE 虛擬檔案誤判與剪貼簿衝突導致當掉的問題
[非同步載入] 網頁遠端圖片全面採用背景非同步執行緒下載，UI 主執行緒零卡頓零凍結
[圖片支援] 支援 Base64 Data URL 圖片解析解碼入架，支援多種圖片二進位點陣圖格式",
[Fix & Stability] Fixed freeze/crash when dragging images from web browsers due to OLE descriptor collision and clipboard lock
[Async Download] Asynchronous background downloading for remote web images, completely non-blocking UI
[Image Support] Added Base64 Data URL decoding support and native binary image drop handling",

1. [拖曳修復] 修正從檔案總管拖曳本機檔案時，因 FileGroupDescriptorW 重疊而誤抓 Ctrl+C 剪貼簿檔案的問題
2. [虛擬檔案隔離] 拖放事件改由 QMimeData 獨立提取虛擬檔案，徹底與系統剪貼簿解耦
3. [穩定性強化] 拖放本機檔案後即時持久化儲存工作階段
4. [Drag & Drop Fix] Fixed an issue where dragging local files from File Explorer could mistakenly grab Ctrl+C clipboard files
5. [Virtual File Isolation] Decoupled drag-and-drop virtual file extraction from the system clipboard
6. [Reliability] Immediately persist session state after dropping local files",