fix(ui): center modals on large screens, modernize edit-metadata + convert sheets, themed badges, fix artist skeleton and format-editor crash

- app: clear displayFeatures so bottom sheets/dialogs center on large/foldable screens

- edit metadata sheet: card sections, modern label-above inputs, elegant collapsible headers, removed title icon

- convert + batch convert: modern card-based sheets; shared BatchConvertSheet widget

- queue: keep selection toolbar hidden until modal close animation finishes

- 24-bit and In Library badges now use primary dynamic color

- artist skeleton: remove duplicate name/listeners lines, keep cover placeholder

- files settings: own filename-format controller in a StatefulWidget to fix use-after-dispose crash

lib/screens/queue_tab_widgets.dart

@@ -89,6 +89,8 @@ class _FilterChip extends StatelessWidget {
       selected: isSelected,
       onSelected: (_) => onTap(),
       showCheckmark: false,
+      backgroundColor: settingsGroupColor(context),
+      side: BorderSide(color: colorScheme.outlineVariant.withValues(alpha: 0.6)),
     );
   }
 }