fix(queue, settings): persist saveDownloadHistory and move queue actions to overflow menu

Add saveDownloadHistory to settings.g.dart fromJson/toJson so the toggle
persists across sessions. Replace standalone retry-failed and clear-all
buttons with a single overflow menu to avoid pushing buttons off screen.

Author: Amonoman

lib/models/settings.g.dart

@@ -3035,9 +3035,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                 const Spacer(),
                 _buildPauseResumeButton(context, ref, colorScheme),
                 const SizedBox(width: 4),
-                _buildRetryAllFailedButton(context, ref, colorScheme),
-                const SizedBox(width: 4),
-                _buildClearAllButton(context, ref, colorScheme),
+                _buildQueueOverflowMenu(context, ref, colorScheme),
               ],
             ),
           ),
@@ -3993,24 +3991,51 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     );
   }
 
-  Widget _buildRetryAllFailedButton(
+  Widget _buildQueueOverflowMenu(
     BuildContext context,
     WidgetRef ref,
     ColorScheme colorScheme,
   ) {
     final failedCount = ref.watch(
       downloadQueueProvider.select((s) => s.failedCount),
     );
-    if (failedCount == 0) return const SizedBox.shrink();
-    return TextButton.icon(
-      onPressed: () =>
-          ref.read(downloadQueueProvider.notifier).retryAllFailed(),
-      icon: const Icon(Icons.replay_rounded, size: 18),
-      label: Text(context.l10n.queueRetryAllFailed(failedCount)),
-      style: TextButton.styleFrom(
-        visualDensity: VisualDensity.compact,
-        foregroundColor: colorScheme.error,
-      ),
+    return PopupMenuButton<String>(
+      icon: const Icon(Icons.more_vert),
+      tooltip: MaterialLocalizations.of(context).moreButtonTooltip,
+      itemBuilder: (ctx) => [
+        if (failedCount > 0)
+          PopupMenuItem(
+            value: 'retry_failed',
+            child: ListTile(
+              leading: const Icon(Icons.replay_rounded),
+              title: Text(context.l10n.queueRetryAllFailed(failedCount)),
+              dense: true,
+              contentPadding: EdgeInsets.zero,
+            ),
+          ),
+        PopupMenuItem(
+          value: 'clear_all',
+          child: ListTile(
+            leading: Icon(Icons.clear_all, color: colorScheme.error),
+            title: Text(
+              context.l10n.queueClearAll,
+              style: TextStyle(color: colorScheme.error),
+            ),
+            dense: true,
+            contentPadding: EdgeInsets.zero,
+          ),
+        ),
+      ],
+      onSelected: (value) {
+        switch (value) {
+          case 'retry_failed':
+            ref.read(downloadQueueProvider.notifier).retryAllFailed();
+            break;
+          case 'clear_all':
+            _showClearAllDialog(context, ref, colorScheme);
+            break;
+        }
+      },
     );
   }