feat(queue): add download-next action on queued items

Queued rows get a skip-next button that reinserts the item ahead of all
other queued items, so the next free slot picks it up. During an active
native worker run the current batch keeps its order; the new order
applies from the next run.

lib/l10n/app_localizations.dart

@@ -6220,6 +6220,12 @@ abstract class AppLocalizations {
   /// **'Finalizing download'**
   String get queueFinalizingDownload;
 
+  /// Tooltip on a queued download row; moves the item to the front of the queue so the next free slot downloads it
+  ///
+  /// In en, this message translates to:
+  /// **'Download next'**
+  String get queueDownloadNext;
+
   /// Accessibility label when a downloaded file is missing from disk
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_ar.dart

@@ -3739,6 +3739,9 @@ class AppLocalizationsAr extends AppLocalizations {
   @override
   String get queueFinalizingDownload => 'Finalizing download';
 
+  @override
+  String get queueDownloadNext => 'Download next';
+
   @override
   String get queueDownloadedFileMissing => 'Downloaded file missing';
 

lib/l10n/app_localizations_de.dart

@@ -3785,6 +3785,9 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get queueFinalizingDownload => 'Download wird abgeschlossen';
 
+  @override
+  String get queueDownloadNext => 'Download next';
+
   @override
   String get queueDownloadedFileMissing => 'Heruntergeladene Datei fehlt';
 

lib/l10n/app_localizations_en.dart

@@ -3739,6 +3739,9 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get queueFinalizingDownload => 'Finalizing download';
 
+  @override
+  String get queueDownloadNext => 'Download next';
+
   @override
   String get queueDownloadedFileMissing => 'Downloaded file missing';
 

lib/l10n/app_localizations_es.dart

@@ -3733,6 +3733,9 @@ class AppLocalizationsEs extends AppLocalizations {
   @override
   String get queueFinalizingDownload => 'Finalizing download';
 
+  @override
+  String get queueDownloadNext => 'Download next';
+
   @override
   String get queueDownloadedFileMissing => 'Downloaded file missing';
 

lib/l10n/app_localizations_fr.dart

@@ -3839,6 +3839,9 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get queueFinalizingDownload => 'Téléchargement en cours';
 
+  @override
+  String get queueDownloadNext => 'Download next';
+
   @override
   String get queueDownloadedFileMissing => 'Fichier téléchargé manquant';
 

lib/l10n/app_localizations_hi.dart

@@ -3739,6 +3739,9 @@ class AppLocalizationsHi extends AppLocalizations {
   @override
   String get queueFinalizingDownload => 'Finalizing download';
 
+  @override
+  String get queueDownloadNext => 'Download next';
+
   @override
   String get queueDownloadedFileMissing => 'Downloaded file missing';
 

lib/l10n/app_localizations_id.dart

@@ -3742,6 +3742,9 @@ class AppLocalizationsId extends AppLocalizations {
   @override
   String get queueFinalizingDownload => 'Finalizing download';
 
+  @override
+  String get queueDownloadNext => 'Download next';
+
   @override
   String get queueDownloadedFileMissing => 'Downloaded file missing';
 

lib/l10n/app_localizations_ja.dart

@@ -3728,6 +3728,9 @@ class AppLocalizationsJa extends AppLocalizations {
   @override
   String get queueFinalizingDownload => 'Finalizing download';
 
+  @override
+  String get queueDownloadNext => 'Download next';
+
   @override
   String get queueDownloadedFileMissing => 'Downloaded file missing';
 

lib/l10n/app_localizations_ko.dart

@@ -3630,6 +3630,9 @@ class AppLocalizationsKo extends AppLocalizations {
   @override
   String get queueFinalizingDownload => '다운로드를 마무리하는 중';
 
+  @override
+  String get queueDownloadNext => 'Download next';
+
   @override
   String get queueDownloadedFileMissing => '다운로드한 파일이 없음';
 

lib/l10n/app_localizations_nl.dart

@@ -3739,6 +3739,9 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get queueFinalizingDownload => 'Finalizing download';
 
+  @override
+  String get queueDownloadNext => 'Download next';
+
   @override
   String get queueDownloadedFileMissing => 'Downloaded file missing';
 

lib/l10n/app_localizations_pt.dart

@@ -3733,6 +3733,9 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get queueFinalizingDownload => 'Finalizing download';
 
+  @override
+  String get queueDownloadNext => 'Download next';
+
   @override
   String get queueDownloadedFileMissing => 'Downloaded file missing';
 

lib/l10n/app_localizations_ru.dart

@@ -3770,6 +3770,9 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get queueFinalizingDownload => 'Finalizing download';
 
+  @override
+  String get queueDownloadNext => 'Download next';
+
   @override
   String get queueDownloadedFileMissing => 'Downloaded file missing';
 

lib/l10n/app_localizations_tr.dart

@@ -3769,6 +3769,9 @@ class AppLocalizationsTr extends AppLocalizations {
   @override
   String get queueFinalizingDownload => 'Finalizing download';
 
+  @override
+  String get queueDownloadNext => 'Download next';
+
   @override
   String get queueDownloadedFileMissing => 'Downloaded file missing';
 

lib/l10n/app_localizations_uk.dart

@@ -3787,6 +3787,9 @@ class AppLocalizationsUk extends AppLocalizations {
   @override
   String get queueFinalizingDownload => 'Finalizing download';
 
+  @override
+  String get queueDownloadNext => 'Download next';
+
   @override
   String get queueDownloadedFileMissing => 'Downloaded file missing';
 

lib/l10n/app_localizations_zh.dart

@@ -3733,6 +3733,9 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get queueFinalizingDownload => 'Finalizing download';
 
+  @override
+  String get queueDownloadNext => 'Download next';
+
   @override
   String get queueDownloadedFileMissing => 'Downloaded file missing';
 

lib/l10n/arb/app_en.arb

@@ -4845,6 +4845,10 @@
   "@queueFinalizingDownload": {
     "description": "Accessibility label for a queue item that is finalizing"
   },
+  "queueDownloadNext": "Download next",
+  "@queueDownloadNext": {
+    "description": "Tooltip on a queued download row; moves the item to the front of the queue so the next free slot downloads it"
+  },
   "queueDownloadedFileMissing": "Downloaded file missing",
   "@queueDownloadedFileMissing": {
     "description": "Accessibility label when a downloaded file is missing from disk"

lib/providers/download_queue_provider.dart

@@ -1670,6 +1670,26 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
     }
   }
 
+  /// Reinserts a queued item ahead of all other queued items so the next
+  /// free download slot picks it up. During an active native worker run the
+  /// current batch keeps its order; the new order applies from the next run.
+  void downloadNext(String id) {
+    final items = state.items;
+    final index = items.indexWhere((item) => item.id == id);
+    if (index == -1) return;
+    final item = items[index];
+    if (item.status != DownloadStatus.queued) return;
+    final firstQueuedIndex = items.indexWhere(
+      (candidate) => candidate.status == DownloadStatus.queued,
+    );
+    if (firstQueuedIndex == index) return;
+    final reordered = List<DownloadItem>.from(items)
+      ..removeAt(index)
+      ..insert(firstQueuedIndex, item);
+    state = state.copyWith(items: reordered);
+    _saveQueueToStorage();
+  }
+
   void removeItem(String id) {
     final removedItem = state.items.where((item) => item.id == id).firstOrNull;
     _locallyCancelledItemIds.remove(id);

lib/screens/queue_tab_item_widgets.dart

@@ -486,14 +486,34 @@ extension _QueueTabItemWidgets on _QueueTabState {
   ) {
     switch (item.status) {
       case DownloadStatus.queued:
-        return IconButton(
-          onPressed: () =>
-              ref.read(downloadQueueProvider.notifier).cancelItem(item.id),
-          icon: Icon(Icons.close, color: colorScheme.error),
-          tooltip: context.l10n.dialogCancel,
-          style: IconButton.styleFrom(
-            backgroundColor: colorScheme.errorContainer.withValues(alpha: 0.3),
-          ),
+        return Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            IconButton(
+              onPressed: () => ref
+                  .read(downloadQueueProvider.notifier)
+                  .downloadNext(item.id),
+              icon: Icon(Icons.skip_next, color: colorScheme.primary),
+              tooltip: context.l10n.queueDownloadNext,
+              style: IconButton.styleFrom(
+                backgroundColor: colorScheme.primaryContainer.withValues(
+                  alpha: 0.3,
+                ),
+              ),
+            ),
+            const SizedBox(width: 4),
+            IconButton(
+              onPressed: () =>
+                  ref.read(downloadQueueProvider.notifier).cancelItem(item.id),
+              icon: Icon(Icons.close, color: colorScheme.error),
+              tooltip: context.l10n.dialogCancel,
+              style: IconButton.styleFrom(
+                backgroundColor: colorScheme.errorContainer.withValues(
+                  alpha: 0.3,
+                ),
+              ),
+            ),
+          ],
         );
       case DownloadStatus.downloading:
         return IconButton(