fix: retry verification browser launch and failed searches

lib/screens/home_tab.dart

@@ -372,6 +372,10 @@ class _HomeTabState extends ConsumerState<HomeTab>
   }
 
   void _onTrackStateChanged(TrackState? previous, TrackState next) {
+    if (next.error != null) {
+      // Failed requests must remain retryable without changing the search text.
+      _lastSearchQuery = null;
+    }
     if (!identical(previous?.tracks, next.tracks)) {
       // Home stays alive across tabs. Empty/loading/error branches can skip
       // result building, so release the previous search's derived lists here.

lib/utils/extension_auth_launcher.dart

@@ -480,9 +480,16 @@ Future<bool> _launchVerificationUrl(Uri uri, String browserMode) async {
       ? LaunchMode.externalApplication
       : LaunchMode.inAppBrowserView;
 
-  var launched = await launchUrl(uri, mode: firstMode);
-  if (!launched) {
-    launched = await launchUrl(uri, mode: fallbackMode);
+  for (final mode in [firstMode, fallbackMode]) {
+    try {
+      if (await launchUrl(uri, mode: mode)) return true;
+    } on PlatformException catch (error) {
+      // Android reports some launch failures as exceptions rather than false.
+      // Keep the other mode and manual verification help available in both cases.
+      _log.w(
+        'Verification browser launch failed (${mode.name}): ${error.code}',
+      );
+    }
   }
-  return launched;
+  return false;
 }