feat: add right-click and keyboard delete for batch table reference thumbnails

- Right-click on reference thumbnail shows context menu with 删除素材
- Delete/Backspace key removes the hovered reference cell
- Both actions only work within the batch table, on the specific thumbnail

fix_shared.py

@@ -0,0 +1,10 @@
+path = r"D:\yingce\open-ai-canvas-main\web\src\pages\canvas\shared.tsx"
+with open(path, "r", encoding="utf-8") as f:
+    content = f.read()
+content = content.replace(
+    'onUploadReference={() => {}} onConnectStart={() => {}}',
+    'onUploadReference={() => {}} onRemoveReference={() => {}} onConnectStart={() => {}}'
+)
+with open(path, "w", encoding="utf-8") as f:
+    f.write(content)
+print("done")