fix(desktop): recover deep-link URL from argv on win/linux cold start

setupDeepLinks() only listened for second-instance and open-url events.
On Windows/Linux a fresh launch via `surfsense://` delivers the URL in
argv of the first instance, where it was silently dropped. Scan argv on
setup so the existing handlePendingDeepLink() pass picks it up.

surfsense_desktop/src/modules/deep-links.ts

@@ -60,6 +60,11 @@ export function setupDeepLinks(): boolean {
     app.setAsDefaultProtocolClient(PROTOCOL);
   }
 
+  // Cold-start on Windows/Linux: protocol URL arrives via argv of the
+  // first instance, not via `second-instance` or `open-url`.
+  const cold = process.argv.find((arg) => arg.startsWith(`${PROTOCOL}://`));
+  if (cold) handleDeepLink(cold);
+
   return true;
 }