chore(i18n): localize folder-access download errors, drop em dashes

The two folder-access failure messages are stored on items as fixed
English sentinels so code can match on them; translate the known
sentinels at display time (error dialog and failed-row message) via new
downloadErrorSafPermissionLost / downloadErrorFolderAccessLost keys.
Also replace em dashes in recently added comments.

lib/l10n/app_localizations.dart

@@ -5353,6 +5353,18 @@ abstract class AppLocalizations {
   /// **'Re-select folder'**
   String get downloadFolderReselect;
 
+  /// Error shown on downloads that failed because the persisted Android SAF folder grant is no longer valid
+  ///
+  /// In en, this message translates to:
+  /// **'SAF permission invalid or revoked. Please reconfigure download location in Settings.'**
+  String get downloadErrorSafPermissionLost;
+
+  /// Error shown on downloads that failed because the iOS download folder bookmark could not be opened
+  ///
+  /// In en, this message translates to:
+  /// **'Download folder access lost. Please re-select your download folder in Settings.'**
+  String get downloadErrorFolderAccessLost;
+
   /// Description shown in filename format editor
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_ar.dart

@@ -3139,6 +3139,14 @@ class AppLocalizationsAr extends AppLocalizations {
   @override
   String get downloadFolderReselect => 'Re-select folder';
 
+  @override
+  String get downloadErrorSafPermissionLost =>
+      'SAF permission invalid or revoked. Please reconfigure download location in Settings.';
+
+  @override
+  String get downloadErrorFolderAccessLost =>
+      'Download folder access lost. Please re-select your download folder in Settings.';
+
   @override
   String downloadFilenameDescription(
     Object album,

lib/l10n/app_localizations_de.dart

@@ -3179,6 +3179,14 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get downloadFolderReselect => 'Re-select folder';
 
+  @override
+  String get downloadErrorSafPermissionLost =>
+      'SAF permission invalid or revoked. Please reconfigure download location in Settings.';
+
+  @override
+  String get downloadErrorFolderAccessLost =>
+      'Download folder access lost. Please re-select your download folder in Settings.';
+
   @override
   String downloadFilenameDescription(
     Object album,

lib/l10n/app_localizations_en.dart

@@ -3139,6 +3139,14 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get downloadFolderReselect => 'Re-select folder';
 
+  @override
+  String get downloadErrorSafPermissionLost =>
+      'SAF permission invalid or revoked. Please reconfigure download location in Settings.';
+
+  @override
+  String get downloadErrorFolderAccessLost =>
+      'Download folder access lost. Please re-select your download folder in Settings.';
+
   @override
   String downloadFilenameDescription(
     Object album,

lib/l10n/app_localizations_es.dart

@@ -3139,6 +3139,14 @@ class AppLocalizationsEs extends AppLocalizations {
   @override
   String get downloadFolderReselect => 'Re-select folder';
 
+  @override
+  String get downloadErrorSafPermissionLost =>
+      'SAF permission invalid or revoked. Please reconfigure download location in Settings.';
+
+  @override
+  String get downloadErrorFolderAccessLost =>
+      'Download folder access lost. Please re-select your download folder in Settings.';
+
   @override
   String downloadFilenameDescription(
     Object album,

lib/l10n/app_localizations_fr.dart

@@ -3223,6 +3223,14 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get downloadFolderReselect => 'Re-select folder';
 
+  @override
+  String get downloadErrorSafPermissionLost =>
+      'SAF permission invalid or revoked. Please reconfigure download location in Settings.';
+
+  @override
+  String get downloadErrorFolderAccessLost =>
+      'Download folder access lost. Please re-select your download folder in Settings.';
+
   @override
   String downloadFilenameDescription(
     Object album,

lib/l10n/app_localizations_hi.dart

@@ -3139,6 +3139,14 @@ class AppLocalizationsHi extends AppLocalizations {
   @override
   String get downloadFolderReselect => 'Re-select folder';
 
+  @override
+  String get downloadErrorSafPermissionLost =>
+      'SAF permission invalid or revoked. Please reconfigure download location in Settings.';
+
+  @override
+  String get downloadErrorFolderAccessLost =>
+      'Download folder access lost. Please re-select your download folder in Settings.';
+
   @override
   String downloadFilenameDescription(
     Object album,

lib/l10n/app_localizations_id.dart

@@ -3122,6 +3122,14 @@ class AppLocalizationsId extends AppLocalizations {
   @override
   String get downloadFolderReselect => 'Re-select folder';
 
+  @override
+  String get downloadErrorSafPermissionLost =>
+      'SAF permission invalid or revoked. Please reconfigure download location in Settings.';
+
+  @override
+  String get downloadErrorFolderAccessLost =>
+      'Download folder access lost. Please re-select your download folder in Settings.';
+
   @override
   String downloadFilenameDescription(
     Object album,

lib/l10n/app_localizations_ja.dart

@@ -3126,6 +3126,14 @@ class AppLocalizationsJa extends AppLocalizations {
   @override
   String get downloadFolderReselect => 'Re-select folder';
 
+  @override
+  String get downloadErrorSafPermissionLost =>
+      'SAF permission invalid or revoked. Please reconfigure download location in Settings.';
+
+  @override
+  String get downloadErrorFolderAccessLost =>
+      'Download folder access lost. Please re-select your download folder in Settings.';
+
   @override
   String downloadFilenameDescription(
     Object album,

lib/l10n/app_localizations_ko.dart

@@ -3124,6 +3124,14 @@ class AppLocalizationsKo extends AppLocalizations {
   @override
   String get downloadFolderReselect => 'Re-select folder';
 
+  @override
+  String get downloadErrorSafPermissionLost =>
+      'SAF permission invalid or revoked. Please reconfigure download location in Settings.';
+
+  @override
+  String get downloadErrorFolderAccessLost =>
+      'Download folder access lost. Please re-select your download folder in Settings.';
+
   @override
   String downloadFilenameDescription(
     Object album,

lib/l10n/app_localizations_nl.dart

@@ -3139,6 +3139,14 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get downloadFolderReselect => 'Re-select folder';
 
+  @override
+  String get downloadErrorSafPermissionLost =>
+      'SAF permission invalid or revoked. Please reconfigure download location in Settings.';
+
+  @override
+  String get downloadErrorFolderAccessLost =>
+      'Download folder access lost. Please re-select your download folder in Settings.';
+
   @override
   String downloadFilenameDescription(
     Object album,

lib/l10n/app_localizations_pt.dart

@@ -3139,6 +3139,14 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get downloadFolderReselect => 'Re-select folder';
 
+  @override
+  String get downloadErrorSafPermissionLost =>
+      'SAF permission invalid or revoked. Please reconfigure download location in Settings.';
+
+  @override
+  String get downloadErrorFolderAccessLost =>
+      'Download folder access lost. Please re-select your download folder in Settings.';
+
   @override
   String downloadFilenameDescription(
     Object album,

lib/l10n/app_localizations_ru.dart

@@ -3194,6 +3194,14 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get downloadFolderReselect => 'Re-select folder';
 
+  @override
+  String get downloadErrorSafPermissionLost =>
+      'SAF permission invalid or revoked. Please reconfigure download location in Settings.';
+
+  @override
+  String get downloadErrorFolderAccessLost =>
+      'Download folder access lost. Please re-select your download folder in Settings.';
+
   @override
   String downloadFilenameDescription(
     Object album,

lib/l10n/app_localizations_tr.dart

@@ -3170,6 +3170,14 @@ class AppLocalizationsTr extends AppLocalizations {
   @override
   String get downloadFolderReselect => 'Re-select folder';
 
+  @override
+  String get downloadErrorSafPermissionLost =>
+      'SAF permission invalid or revoked. Please reconfigure download location in Settings.';
+
+  @override
+  String get downloadErrorFolderAccessLost =>
+      'Download folder access lost. Please re-select your download folder in Settings.';
+
   @override
   String downloadFilenameDescription(
     Object album,

lib/l10n/app_localizations_uk.dart

@@ -3186,6 +3186,14 @@ class AppLocalizationsUk extends AppLocalizations {
   @override
   String get downloadFolderReselect => 'Re-select folder';
 
+  @override
+  String get downloadErrorSafPermissionLost =>
+      'SAF permission invalid or revoked. Please reconfigure download location in Settings.';
+
+  @override
+  String get downloadErrorFolderAccessLost =>
+      'Download folder access lost. Please re-select your download folder in Settings.';
+
   @override
   String downloadFilenameDescription(
     Object album,

lib/l10n/app_localizations_zh.dart

@@ -3139,6 +3139,14 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get downloadFolderReselect => 'Re-select folder';
 
+  @override
+  String get downloadErrorSafPermissionLost =>
+      'SAF permission invalid or revoked. Please reconfigure download location in Settings.';
+
+  @override
+  String get downloadErrorFolderAccessLost =>
+      'Download folder access lost. Please re-select your download folder in Settings.';
+
   @override
   String downloadFilenameDescription(
     Object album,

lib/l10n/arb/app_en.arb

@@ -4122,6 +4122,14 @@
   "@downloadFolderReselect": {
     "description": "Button that reopens the folder picker to restore download folder access"
   },
+  "downloadErrorSafPermissionLost": "SAF permission invalid or revoked. Please reconfigure download location in Settings.",
+  "@downloadErrorSafPermissionLost": {
+    "description": "Error shown on downloads that failed because the persisted Android SAF folder grant is no longer valid"
+  },
+  "downloadErrorFolderAccessLost": "Download folder access lost. Please re-select your download folder in Settings.",
+  "@downloadErrorFolderAccessLost": {
+    "description": "Error shown on downloads that failed because the iOS download folder bookmark could not be opened"
+  },
   "downloadFilenameDescription": "Use {artist}, {title}, {album}, {track}, {year}, {date}, {disc} as placeholders.",
   "@downloadFilenameDescription": {
     "description": "Description shown in filename format editor"

lib/screens/queue_tab.dart

@@ -3421,7 +3421,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     final message = isRateLimit
         ? context.l10n.queueRateLimitMessage
         : (item.errorMessage.trim().isNotEmpty
-              ? item.errorMessage
+              ? _localizedDownloadError(context, item.errorMessage)
               : context.l10n.updateDownloadFailed);
     final action = await showDialog<String>(
       context: context,
@@ -4239,7 +4239,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
         final expired =
             addedAt == null || now.difference(addedAt).inSeconds >= 6;
         if (activeDownloadIds.contains(id)) {
-          // Re-queued (retry) — the live row takes over from the bridge.
+          // Re-queued (retry): the live row takes over from the bridge.
           stale.add(id);
         } else if (hasActiveDownloads) {
           // Keep just-completed tracks pinned in the lead zone while the
@@ -6603,6 +6603,18 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     );
   }
 
+  /// Download error messages are stored as fixed English sentinels on the
+  /// item (so code can match on them); translate the known ones for display.
+  String _localizedDownloadError(BuildContext context, String raw) {
+    if (raw == safPermissionLostErrorMessage) {
+      return context.l10n.downloadErrorSafPermissionLost;
+    }
+    if (raw == downloadFolderAccessLostErrorMessage) {
+      return context.l10n.downloadErrorFolderAccessLost;
+    }
+    return raw;
+  }
+
   Widget _buildDownloadFailureMessage(
     BuildContext context,
     DownloadItem item,
@@ -6610,7 +6622,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
   ) {
     if (item.errorType != DownloadErrorType.rateLimit) {
       return Text(
-        item.errorMessage,
+        _localizedDownloadError(context, item.errorMessage),
         maxLines: 1,
         overflow: TextOverflow.ellipsis,
         style: Theme.of(

lib/services/platform_bridge.dart

@@ -2068,7 +2068,7 @@ class PlatformBridge {
 
   /// Present the native iOS folder picker. The security-scoped bookmark is
   /// created inside the picker callback while its access grant is still
-  /// active — creating it later from a bare path loses the grant.
+  /// active; creating it later from a bare path loses the grant.
   /// Returns null when the user cancels; throws on picker/bookmark failure.
   static Future<IosPickedDirectory?> pickIosDirectory() async {
     final result = await _channel.invokeMethod('pickIosDirectory');