feat: drag file to chatbot to upload 拖动以上传文件 (#1396)

* feat: 拖动以上传文件

* 上传文件过程中转圈圈

* fix: 解决仅在第一次上传时才有上传动画的问题

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Co-authored-by: 505030475 <qingxu.fu@outlook.com>

main.py

@@ -292,7 +292,9 @@ def main():
             cancel_handles.append(click_handle)
         # 文件上传区，接收文件后与chatbot的互动
         file_upload.upload(on_file_uploaded, [file_upload, chatbot, txt, txt2, checkboxes, cookies], [chatbot, txt, txt2, cookies])
+        file_upload.upload(None, None, None,   _js=r"()=>{toast_push('上传完毕, 请等待文件清单展现后继续操作 ...'); cancel_loading_status();}")
         file_upload_2.upload(on_file_uploaded, [file_upload_2, chatbot, txt, txt2, checkboxes, cookies], [chatbot, txt, txt2, cookies])
+        file_upload_2.upload(None, None, None, _js=r"()=>{toast_push('上传完毕, 请等待文件清单展现后继续操作 ...'); cancel_loading_status();}")
         # 函数插件-固定按钮区
         for k in plugins:
             if not plugins[k].get("AsButton", True): continue