Fix WebTorrent client race condition and silence legacy avatar warning

- Added a null check for `this.client` in `js/webtorrent.js` after `await this.init()` to prevent `TypeError` when cleanup occurs during initialization.
- Updated `js/utils/profileMedia.js` to silently ignore the legacy `images/robot.png` path, preventing "Unsupported media URL" warnings.

Co-authored-by: PR0M3TH3AN <[email protected]>

js/utils/profileMedia.js

@@ -46,6 +46,10 @@ export function sanitizeProfileMediaUrl(value) {
     return trimmed;
   }
 
+  if (trimmed === "images/robot.png") {
+    return "";
+  }
+
   if (/^ipfs:\/\//i.test(trimmed)) {
     return normalizeIpfsGatewayUrl(trimmed);
   }

js/webtorrent.js

@@ -873,6 +873,11 @@ export class TorrentClient {
       emit("torrent-stream-start", { magnet: magnetURI });
       // 1) Make sure we have a WebTorrent client and a valid SW registration.
       const initResult = await this.init();
+
+      if (!this.client) {
+        throw new Error("Client destroyed during initialization");
+      }
+
       const serviceWorkerReady =
         !!(initResult?.serviceWorkerReady && this.swRegistration);