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_remove_ref.py

@@ -0,0 +1,20 @@
+path = r"D:\yingce\open-ai-canvas-main\web\src\pages\canvas\project.tsx"
+with open(path, "r", encoding="utf-8") as f:
+    content = f.read()
+
+old_upload = '                        onUploadReference={(rowId, columnIndex, file) => { void handleUploadBatchReference(contentNode.id, rowId, columnIndex, file); }}'
+new_upload = '''                        onUploadReference={(rowId, columnIndex, file) => { void handleUploadBatchReference(contentNode.id, rowId, columnIndex, file); }}
+                        onRemoveReference={(rowId, columnIndex) => {
+                            const table = nodesRef.current.find((n) => n.id === contentNode.id)?.metadata?.batchTable;
+                            if (!table) return;
+                            const row = table.rows.find((r) => r.id === rowId);
+                            if (!row) return;
+                            const newInputNodeIds = [...row.inputNodeIds];
+                            newInputNodeIds[columnIndex] = "";
+                            updateBatchRow(contentNode.id, rowId, { inputNodeIds: newInputNodeIds });
+                        }}'''
+content = content.replace(old_upload, new_upload, 1)
+
+with open(path, "w", encoding="utf-8") as f:
+    f.write(content)
+print("done")