feat(tablet): clamp remaining screens - settings, queue lists, wizard

- SettingsGroup centers itself at 720dp via its incoming constraint
  (not screen width, so groups inside clamped sheets are never
  over-inset; unbounded-width contexts guarded); priority scaffold,
  bespoke hero cards, and donate page get the same inset - all 18+
  settings pages clamp from shared widgets
- queue list-mode, local/downloaded album track lists, favorite
  artists, home recent-access, and extension detail sections adopt
  wideListInset like the screens fixed earlier
- track metadata content clamped at 720dp, which also tames the
  width-derived spectrogram height
- announcement dialog capped at 480dp wide; setup wizard and
  tutorial content at 560dp with a 400dp action button

lib/widgets/app_announcement_dialog.dart

@@ -101,7 +101,7 @@ class AppAnnouncementDialog extends StatelessWidget {
           ],
         ),
         content: ConstrainedBox(
-          constraints: const BoxConstraints(maxHeight: 260),
+          constraints: const BoxConstraints(maxHeight: 260, maxWidth: 480),
           child: SingleChildScrollView(
             child: Text(
               announcement.message,

lib/widgets/priority_settings_scaffold.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:spotiflac_android/l10n/l10n.dart';
+import 'package:spotiflac_android/utils/adaptive_layout.dart';
 import 'package:spotiflac_android/widgets/settings_sliver_app_bar.dart';
 
 class PrioritySettingsScaffold extends StatelessWidget {
@@ -40,6 +41,7 @@ class PrioritySettingsScaffold extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
+    final wideInset = wideListInset(context);
 
     return PopScope(
       canPop: !hasChanges,
@@ -70,7 +72,9 @@ class PrioritySettingsScaffold extends StatelessWidget {
             ),
             SliverToBoxAdapter(
               child: Padding(
-                padding: descriptionPadding,
+                padding: descriptionPadding.add(
+                  EdgeInsets.symmetric(horizontal: wideInset),
+                ),
                 child: Text(
                   description,
                   style: Theme.of(context).textTheme.bodyMedium?.copyWith(
@@ -82,7 +86,12 @@ class PrioritySettingsScaffold extends StatelessWidget {
             ...slivers,
             SliverToBoxAdapter(
               child: Padding(
-                padding: const EdgeInsets.all(16),
+                padding: EdgeInsets.fromLTRB(
+                  16 + wideInset,
+                  16,
+                  16 + wideInset,
+                  16,
+                ),
                 child: Container(
                   padding: const EdgeInsets.all(12),
                   decoration: BoxDecoration(

lib/widgets/settings_group.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:spotiflac_android/utils/adaptive_layout.dart';
 
 /// Background fill for grouped cards, matching the Settings group look. Blends a
 /// translucent overlay over the surface so it stays visible on AMOLED (pure
@@ -28,19 +29,42 @@ class SettingsGroup extends StatelessWidget {
     final cardColor = settingsGroupColor(context);
     final colorScheme = Theme.of(context).colorScheme;
 
-    return Container(
-      margin: margin ?? const EdgeInsets.symmetric(horizontal: 16, vertical: 4),
-      decoration: BoxDecoration(
-        color: cardColor,
-        borderRadius: BorderRadius.circular(20),
-        border: Border.all(
-          color: colorScheme.outlineVariant.withValues(alpha: 0.5),
-        ),
+    final decoration = BoxDecoration(
+      color: cardColor,
+      borderRadius: BorderRadius.circular(20),
+      border: Border.all(
+        color: colorScheme.outlineVariant.withValues(alpha: 0.5),
       ),
-      clipBehavior: Clip.antiAlias,
-      child: Material(
-        color: Colors.transparent,
-        child: Column(mainAxisSize: MainAxisSize.min, children: children),
+    );
+    final child = Material(
+      color: Colors.transparent,
+      child: Column(mainAxisSize: MainAxisSize.min, children: children),
+    );
+
+    // Explicit caller margin wins as-is. Otherwise center on wide surfaces
+    // using the incoming constraint (not screen width) so groups nested in an
+    // already clamped box, e.g. a bottom sheet, are not over-inset.
+    if (margin != null) {
+      return Container(
+        margin: margin,
+        decoration: decoration,
+        clipBehavior: Clip.antiAlias,
+        child: child,
+      );
+    }
+    return LayoutBuilder(
+      builder: (context, constraints) => Container(
+        margin: EdgeInsets.symmetric(
+          horizontal:
+              16 +
+              (constraints.hasBoundedWidth
+                  ? wideInsetForWidth(constraints.maxWidth)
+                  : 0),
+          vertical: 4,
+        ),
+        decoration: decoration,
+        clipBehavior: Clip.antiAlias,
+        child: child,
       ),
     );
   }