feat: Prevent tag transfers on folders

frontend/src/documents/features/folders/useFolderItemLogic.ts

@@ -1,4 +1,5 @@
 import React, { type DragEvent } from 'react';
+import { isTagTransferEvent } from '../tagging/tagTransfer';
 import type { DocumentViewLogic } from '../../logic/useDocumentViewLogic';
 import { useDocumentsCommandContext } from '../../context/DocumentsCommandContext';
 import { useDocumentsViewStateContext } from '../../context/DocumentsViewStateContext';
@@ -63,9 +64,26 @@ export const useFolderItemLogic = (props: UseFolderItemLogicProps) => {
             event.preventDefault();
             onFolderSelect?.(folder.id);
         },
-        onDragOver: (event: DragEvent<HTMLElement>) => onFolderDragOver?.(event, folder.id),
+        onDragOver: (event: DragEvent<HTMLElement>) => {
+            if (isTagTransferEvent(event)) {
+                event.preventDefault();
+                event.stopPropagation();
+                if (event.dataTransfer) {
+                    event.dataTransfer.dropEffect = 'none';
+                }
+                return;
+            }
+            onFolderDragOver?.(event, folder.id);
+        },
         onDragLeave: onFolderDragLeave,
-        onDrop: (event: DragEvent<HTMLElement>) => onFolderDrop?.(event, folder.id),
+        onDrop: (event: DragEvent<HTMLElement>) => {
+            if (isTagTransferEvent(event)) {
+                event.preventDefault();
+                event.stopPropagation();
+                return;
+            }
+            onFolderDrop?.(event, folder.id);
+        },
         onDragStart: (event: DragEvent<HTMLElement>) => {
             if (canDragFolder) {
                 onFolderDragStart?.(event, folder.id);