fix: improve WebRTC loading indicator

web/src/pages/desktop/screen/h264-webrtc.tsx

@@ -1,4 +1,5 @@
 import { useEffect, useRef, useState } from 'react';
+import { Spin } from 'antd';
 import clsx from 'clsx';
 import { useAtom, useAtomValue } from 'jotai';
 import { w3cwebsocket as W3cWebSocket } from 'websocket';
@@ -85,12 +86,6 @@ export const H264Webrtc = () => {
         }
       };
 
-      peer.onconnectionstatechange = () => {
-        if (peer.iceConnectionState === 'connected' || peer.connectionState === 'connected') {
-          setIsLoading(false);
-        }
-      };
-
       peer.ontrack = (event) => {
         if (videoElement && event.track.kind === 'video') {
           videoElement.srcObject = new MediaStream([event.track]);
@@ -258,10 +253,8 @@ export const H264Webrtc = () => {
       </div>
 
       {isLoading && (
-        <div className="pointer-events-none absolute inset-0 flex items-center justify-center bg-black/20">
-          <div className="rounded-full bg-neutral-900/85 px-4 py-2 text-sm text-neutral-100 shadow-lg">
-            Loading
-          </div>
+        <div className="pointer-events-none absolute inset-0 z-50 flex items-center justify-center bg-black/30 backdrop-blur-[2px] transition-all duration-300">
+          <Spin size="large" />
         </div>
       )}
     </div>