feat: alphabet list, change Layout etc

lib/l10n/app_localizations_helpers.dart

@@ -1,4 +1,5 @@
 import '../models/app_error.dart';
+import '../models/update_failure.dart';
 import 'app_localizations.dart';
 
 extension AppLocalizationsHelpers on AppLocalizations {
@@ -44,47 +45,18 @@ extension AppLocalizationsHelpers on AppLocalizations {
     };
   }
 
-  /// Update messages still come from the OTA plugin as plain strings.
-  String _updateMessage(String? message) {
-    return switch (message) {
-      'Update failed' => updateFailed,
-      'Download failed' => downloadFailed,
-      'Installation failed' => installationFailed,
-      'Update already in progress' => updateAlreadyInProgress,
-      _ => message ?? genericError,
+  String updateFailureText(UpdateFailure? failure) {
+    return switch (failure) {
+      UpdateFailure.download => updateDownloadFailed,
+      UpdateFailure.checksum => updateChecksumFailed,
+      UpdateFailure.permission => updatePermissionDenied,
+      UpdateFailure.install => updateInstallFailed,
+      UpdateFailure.alreadyRunning => updateAlreadyInProgress,
+      UpdateFailure.simulated => simulatedDownloadError,
+      UpdateFailure.unknown || null => updateFailed,
     };
   }
 
-  String updateStatus(String status) {
-    if (status.startsWith('Downloading ')) {
-      return downloading(status.substring('Downloading '.length));
-    }
-
-    return switch (status) {
-      'Preparing download…' => preparingDownload,
-      'Download failed' => downloadFailed,
-      'Installing update…' => installingUpdate,
-      'Update installed! Restarting…' => updateInstalledRestarting,
-      'Installation failed' => installationFailed,
-      'Update already running' => updateAlreadyRunning,
-      _ => status,
-    };
-  }
-
-  String updateError(String? message) {
-    if (message == null) return updateFailed;
-    if (message.startsWith('Download failed')) return downloadFailedWithDetail;
-    if (message.startsWith('Installation failed')) {
-      return installationFailedWithDetail;
-    }
-    if (message == 'Simulated download error (network timeout)') {
-      return simulatedDownloadError;
-    }
-    if (message == 'Update already in progress') return updateAlreadyInProgress;
-
-    return _updateMessage(message);
-  }
-
   String devAction(String? message) {
     if (message == null) return '';