refactor(ui): standardize modal sheets

lib/screens/home_tab.dart

@@ -2,6 +2,9 @@ import 'dart:async';
 import 'dart:io';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
+import 'package:spotiflac_android/theme/app_tokens.dart';
+import 'package:spotiflac_android/widgets/app_bottom_sheet.dart';
+import 'package:spotiflac_android/widgets/app_sliver_header.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:spotiflac_android/l10n/l10n.dart';
@@ -21,7 +24,6 @@ import 'package:spotiflac_android/screens/home_search_logic.dart';
 import 'package:spotiflac_android/services/csv_import_service.dart';
 import 'package:spotiflac_android/services/downloaded_embedded_cover_resolver.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
-import 'package:spotiflac_android/utils/app_bar_layout.dart';
 import 'package:spotiflac_android/utils/adaptive_layout.dart';
 import 'package:spotiflac_android/utils/nav_bar_inset.dart';
 import 'package:spotiflac_android/utils/file_access.dart';
@@ -747,7 +749,6 @@ class _HomeTabState extends ConsumerState<HomeTab>
       trackProvider.select((s) => s.isShowingRecentAccess),
     );
     final screenHeight = MediaQuery.sizeOf(context).height;
-    final topPadding = normalizedHeaderTopPadding(context);
     final bottomInset = context.navBarBottomInset;
     final hasHistoryItems = ref.watch(
       _homeHistoryPreviewProvider.select((items) => items.isNotEmpty),
@@ -840,38 +841,7 @@ class _HomeTabState extends ConsumerState<HomeTab>
           child: CustomScrollView(
             keyboardDismissBehavior: ScrollViewKeyboardDismissBehavior.onDrag,
             slivers: [
-              SliverAppBar(
-                expandedHeight: 120 + topPadding,
-                collapsedHeight: kToolbarHeight,
-                floating: false,
-                pinned: true,
-                backgroundColor: colorScheme.surface,
-                surfaceTintColor: Colors.transparent,
-                automaticallyImplyLeading: false,
-                flexibleSpace: LayoutBuilder(
-                  builder: (context, constraints) {
-                    final maxHeight = 120 + topPadding;
-                    final minHeight = kToolbarHeight + topPadding;
-                    final expandRatio =
-                        ((constraints.maxHeight - minHeight) /
-                                (maxHeight - minHeight))
-                            .clamp(0.0, 1.0);
-
-                    return FlexibleSpaceBar(
-                      expandedTitleScale: 1.0,
-                      titlePadding: const EdgeInsets.only(left: 24, bottom: 16),
-                      title: Text(
-                        context.l10n.homeTitle,
-                        style: TextStyle(
-                          fontSize: 20 + (14 * expandRatio),
-                          fontWeight: FontWeight.bold,
-                          color: colorScheme.onSurface,
-                        ),
-                      ),
-                    );
-                  },
-                ),
-              ),
+              AppSliverHeader.tabRoot(title: context.l10n.homeTitle),
 
               SliverToBoxAdapter(
                 child: AnimatedSize(

lib/screens/home_tab_explore.dart

@@ -354,22 +354,11 @@ extension _HomeTabExploreUI on _HomeTabState {
       context: context,
       useRootNavigator: true,
       backgroundColor: colorScheme.surface,
-      shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
-      ),
       builder: (context) => SafeArea(
         child: Column(
           mainAxisSize: MainAxisSize.min,
           children: [
-            Container(
-              margin: const EdgeInsets.only(top: 12),
-              width: 40,
-              height: 4,
-              decoration: BoxDecoration(
-                color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4),
-                borderRadius: BorderRadius.circular(2),
-              ),
-            ),
+            const AppSheetHandle(),
             Padding(
               padding: const EdgeInsets.all(16),
               child: Row(

lib/screens/setup_screen.dart

@@ -320,9 +320,6 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
       context: context,
       useRootNavigator: true,
       backgroundColor: colorScheme.surfaceContainerHigh,
-      shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
-      ),
       builder: (ctx) => SafeArea(
         child: Column(
           mainAxisSize: MainAxisSize.min,

lib/screens/track_metadata_actions.dart

@@ -54,9 +54,6 @@ extension _TrackMetadataFileActions on _TrackMetadataScreenState {
       useRootNavigator: true,
       isScrollControlled: true,
       backgroundColor: colorScheme.surface,
-      shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
-      ),
       builder: (sheetContext) => _EditMetadataSheet(
         colorScheme: colorScheme,
         initialValues: initialValues,

lib/screens/track_metadata_convert.dart

@@ -235,9 +235,6 @@ extension _TrackMetadataConvertAndCueSplit on _TrackMetadataScreenState {
       context: context,
       useRootNavigator: true,
       isScrollControlled: true,
-      shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
-      ),
       builder: (sheetContext) => BatchConvertSheet(
         formats: formats,
         title: context.l10n.trackConvertTitle,
@@ -337,9 +334,6 @@ extension _TrackMetadataConvertAndCueSplit on _TrackMetadataScreenState {
         context: this.context,
         useRootNavigator: true,
         isScrollControlled: true,
-        shape: const RoundedRectangleBorder(
-          borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
-        ),
         builder: (sheetContext) {
           final colorScheme = Theme.of(sheetContext).colorScheme;
           return SafeArea(
@@ -349,18 +343,7 @@ extension _TrackMetadataConvertAndCueSplit on _TrackMetadataScreenState {
                 mainAxisSize: MainAxisSize.min,
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
-                  Center(
-                    child: Container(
-                      width: 40,
-                      height: 4,
-                      decoration: BoxDecoration(
-                        color: colorScheme.onSurfaceVariant.withValues(
-                          alpha: 0.4,
-                        ),
-                        borderRadius: BorderRadius.circular(2),
-                      ),
-                    ),
-                  ),
+                  const AppSheetHandle(),
                   const SizedBox(height: 16),
                   Text(
                     sheetContext.l10n.cueSplitTitle,

lib/screens/track_metadata_edit_sheet.dart

@@ -108,9 +108,6 @@ class _EditMetadataSheetState extends State<_EditMetadataSheet> {
       isScrollControlled: true,
       showDragHandle: true,
       backgroundColor: Theme.of(context).colorScheme.surfaceContainerHigh,
-      shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
-      ),
       builder: (sheetContext) {
         final cs = Theme.of(sheetContext).colorScheme;
         final currentId =
@@ -1547,14 +1544,7 @@ class _EditMetadataSheetState extends State<_EditMetadataSheet> {
               children: [
                 Padding(
                   padding: const EdgeInsets.only(top: 12, bottom: 8),
-                  child: Container(
-                    width: 40,
-                    height: 4,
-                    decoration: BoxDecoration(
-                      color: cs.onSurfaceVariant.withValues(alpha: 0.4),
-                      borderRadius: BorderRadius.circular(2),
-                    ),
-                  ),
+                  child: const AppSheetHandle(),
                 ),
                 Padding(
                   padding: const EdgeInsets.fromLTRB(20, 4, 20, 12),

lib/screens/track_metadata_screen.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:io';
 import 'dart:ui' show ImageFilter;
 import 'package:flutter/material.dart';
+import 'package:spotiflac_android/widgets/app_bottom_sheet.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:file_picker/file_picker.dart';

lib/screens/track_metadata_screen_menu.dart

@@ -12,9 +12,6 @@ extension _TrackMetadataMenu on _TrackMetadataScreenState {
       context: screenContext,
       useRootNavigator: true,
       backgroundColor: colorScheme.surfaceContainerHigh,
-      shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
-      ),
       isScrollControlled: true,
       builder: (sheetContext) {
         final l10n = sheetContext.l10n;
@@ -115,19 +112,7 @@ extension _TrackMetadataMenu on _TrackMetadataScreenState {
               child: Column(
                 mainAxisSize: MainAxisSize.min,
                 children: [
-                  const SizedBox(height: 8),
-                  Center(
-                    child: Container(
-                      width: 40,
-                      height: 4,
-                      decoration: BoxDecoration(
-                        color: colorScheme.onSurfaceVariant.withValues(
-                          alpha: 0.4,
-                        ),
-                        borderRadius: BorderRadius.circular(2),
-                      ),
-                    ),
-                  ),
+                  const AppSheetHandle(),
                   Padding(
                     padding: const EdgeInsets.fromLTRB(16, 12, 16, 12),
                     child: Row(

lib/services/batch_track_actions.dart

@@ -96,9 +96,6 @@ Future<void> showBatchConvertSheet(
     context: modalContext,
     useRootNavigator: true,
     isScrollControlled: true,
-    shape: const RoundedRectangleBorder(
-      borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
-    ),
     builder: (sheetContext) => BatchConvertSheet(
       formats: formats,
       title: sheetTitle,

lib/widgets/app_bottom_sheet.dart

@@ -0,0 +1,167 @@
+import 'package:flutter/material.dart';
+import 'package:spotiflac_android/theme/app_tokens.dart';
+
+/// The drag handle shown at the top of every modal sheet.
+///
+/// Seventeen copies of this container existed across the app in two sizes
+/// (40x4 tinted `onSurfaceVariant`, 32x4 tinted `outlineVariant`) with four
+/// different margins. Sheets that opt into Material's own `showDragHandle`
+/// get an equivalent affordance from the framework and should not add this.
+class AppSheetHandle extends StatelessWidget {
+  const AppSheetHandle({super.key, this.margin});
+
+  /// Overrides the default spacing around the handle. Sheets whose first row
+  /// already carries top padding pass [EdgeInsets.zero].
+  final EdgeInsetsGeometry? margin;
+
+  static const double _width = 40;
+  static const double _height = 4;
+
+  @override
+  Widget build(BuildContext context) {
+    final tokens = context.tokens;
+    return ExcludeSemantics(
+      child: Center(
+        child: Container(
+          width: _width,
+          height: _height,
+          margin:
+              margin ??
+              EdgeInsets.only(top: tokens.gapMd, bottom: tokens.gapSm),
+          decoration: BoxDecoration(
+            color: Theme.of(
+              context,
+            ).colorScheme.onSurfaceVariant.withValues(alpha: 0.4),
+            borderRadius: BorderRadius.circular(_height / 2),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+/// Standard chrome for modal sheet content: drag handle, optional title block,
+/// height cap, keyboard inset and bottom safe area, so each sheet only supplies
+/// its own body.
+class AppBottomSheet extends StatelessWidget {
+  const AppBottomSheet({
+    super.key,
+    required this.child,
+    this.showHandle = true,
+    this.title,
+    this.subtitle,
+    this.maxHeightFactor,
+  });
+
+  final Widget child;
+  final bool showHandle;
+
+  /// Leading title row. Rendered with the app's single sheet-title style
+  /// instead of the three variants that had accumulated across sheets.
+  final String? title;
+
+  /// Secondary line under [title], e.g. the track a sheet is acting on.
+  final String? subtitle;
+
+  /// Caps the sheet at this fraction of the screen height.
+  final double? maxHeightFactor;
+
+  @override
+  Widget build(BuildContext context) {
+    final tokens = context.tokens;
+    final theme = Theme.of(context);
+
+    Widget content = Column(
+      mainAxisSize: MainAxisSize.min,
+      crossAxisAlignment: CrossAxisAlignment.stretch,
+      children: [
+        if (showHandle) const AppSheetHandle(),
+        if (title != null)
+          Padding(
+            padding: EdgeInsets.fromLTRB(
+              tokens.gapXl,
+              tokens.gapLg,
+              tokens.gapXl,
+              subtitle == null ? tokens.gapSm : tokens.gapXs,
+            ),
+            child: Text(
+              title!,
+              style: theme.textTheme.titleMedium?.copyWith(
+                fontWeight: FontWeight.w600,
+              ),
+            ),
+          ),
+        if (subtitle != null)
+          Padding(
+            padding: EdgeInsets.fromLTRB(
+              tokens.gapXl,
+              0,
+              tokens.gapXl,
+              tokens.gapMd,
+            ),
+            child: Text(
+              subtitle!,
+              maxLines: 1,
+              overflow: TextOverflow.ellipsis,
+              style: theme.textTheme.bodyMedium?.copyWith(
+                color: theme.colorScheme.onSurfaceVariant,
+              ),
+            ),
+          ),
+        Flexible(child: child),
+      ],
+    );
+
+    if (maxHeightFactor != null) {
+      content = ConstrainedBox(
+        constraints: BoxConstraints(
+          maxHeight: MediaQuery.sizeOf(context).height * maxHeightFactor!,
+        ),
+        child: content,
+      );
+    }
+
+    // Sheets containing text fields must lift above the keyboard; doing it here
+    // means no call site has to remember `viewInsets`.
+    final keyboardInset = MediaQuery.viewInsetsOf(context).bottom;
+    return Padding(
+      padding: EdgeInsets.only(bottom: keyboardInset),
+      child: SafeArea(top: false, child: content),
+    );
+  }
+}
+
+/// Opens a modal bottom sheet wrapped in [AppBottomSheet].
+///
+/// The shape comes from `ThemeData.bottomSheetTheme`, which is derived from
+/// [AppTokens.radiusSheet]; call sites no longer pass a `shape` and therefore
+/// cannot drift from the scale.
+Future<T?> showAppBottomSheet<T>({
+  required BuildContext context,
+  required WidgetBuilder builder,
+  String? title,
+  String? subtitle,
+  double? maxHeightFactor,
+  bool isScrollControlled = true,
+  bool isDismissible = true,
+  bool enableDrag = true,
+  bool useRootNavigator = false,
+  bool showHandle = true,
+  Color? backgroundColor,
+}) {
+  return showModalBottomSheet<T>(
+    context: context,
+    isScrollControlled: isScrollControlled,
+    isDismissible: isDismissible,
+    enableDrag: enableDrag,
+    useRootNavigator: useRootNavigator,
+    backgroundColor: backgroundColor,
+    builder: (sheetContext) => AppBottomSheet(
+      showHandle: showHandle,
+      title: title,
+      subtitle: subtitle,
+      maxHeightFactor: maxHeightFactor,
+      child: builder(sheetContext),
+    ),
+  );
+}

lib/widgets/batch_convert_sheet.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:spotiflac_android/widgets/app_bottom_sheet.dart';
 import 'package:spotiflac_android/l10n/l10n.dart';
 import 'package:spotiflac_android/utils/audio_conversion_utils.dart';
 import 'package:spotiflac_android/widgets/settings_group.dart';
@@ -100,16 +101,7 @@ class _BatchConvertSheetState extends State<BatchConvertSheet> {
               mainAxisSize: MainAxisSize.min,
               crossAxisAlignment: CrossAxisAlignment.start,
               children: [
-                Center(
-                  child: Container(
-                    width: 40,
-                    height: 4,
-                    decoration: BoxDecoration(
-                      color: cs.onSurfaceVariant.withValues(alpha: 0.4),
-                      borderRadius: BorderRadius.circular(2),
-                    ),
-                  ),
-                ),
+                const AppSheetHandle(),
                 const SizedBox(height: 18),
                 Text(
                   widget.title,

lib/widgets/cross_extension_share_sheet.dart

@@ -1,6 +1,7 @@
 import 'dart:io';
 
 import 'package:flutter/material.dart';
+import 'package:spotiflac_android/widgets/app_bottom_sheet.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:spotiflac_android/l10n/l10n.dart';
@@ -30,14 +31,13 @@ class CrossExtensionShareSheet extends ConsumerStatefulWidget {
     required String sourceExtensionId,
   }) {
     final colorScheme = Theme.of(context).colorScheme;
-    return showModalBottomSheet<void>(
+    return showAppBottomSheet<void>(
       context: context,
       useRootNavigator: true,
-      isScrollControlled: true,
       backgroundColor: colorScheme.surfaceContainerHigh,
-      shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
-      ),
+      title: context.l10n.openInOtherServices,
+      subtitle: artists.isNotEmpty ? '$name - $artists' : name,
+      maxHeightFactor: 0.82,
       builder: (_) => CrossExtensionShareSheet(
         name: name,
         artists: artists,
@@ -93,93 +93,44 @@ class _CrossExtensionShareSheetState
     final colorScheme = Theme.of(context).colorScheme;
     final textTheme = Theme.of(context).textTheme;
 
-    return SafeArea(
-      top: false,
-      child: ConstrainedBox(
-        constraints: BoxConstraints(
-          maxHeight: MediaQuery.sizeOf(context).height * 0.82,
-        ),
-        child: Column(
-          mainAxisSize: MainAxisSize.min,
-          crossAxisAlignment: CrossAxisAlignment.stretch,
-          children: [
-            const SizedBox(height: 8),
-            Center(
-              child: Container(
-                width: 40,
-                height: 4,
-                decoration: BoxDecoration(
-                  color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4),
-                  borderRadius: BorderRadius.circular(2),
-                ),
-              ),
-            ),
-            Padding(
-              padding: const EdgeInsets.fromLTRB(24, 16, 24, 4),
+    return FutureBuilder<List<CrossExtensionShareResult>>(
+      future: _future,
+      builder: (context, snapshot) {
+        if (snapshot.connectionState != ConnectionState.done) {
+          return const SizedBox(
+            height: 180,
+            child: Center(child: CircularProgressIndicator()),
+          );
+        }
+
+        final results = snapshot.data ?? const [];
+        if (results.isEmpty) {
+          return SizedBox(
+            height: 180,
+            child: Center(
               child: Text(
-                context.l10n.openInOtherServices,
-                style: textTheme.titleMedium?.copyWith(
-                  fontWeight: FontWeight.bold,
-                ),
-              ),
-            ),
-            Padding(
-              padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
-              child: Text(
-                widget.artists.isNotEmpty
-                    ? '${widget.name} - ${widget.artists}'
-                    : widget.name,
-                maxLines: 1,
-                overflow: TextOverflow.ellipsis,
+                context.l10n.shareSheetNoExtensions,
                 style: textTheme.bodyMedium?.copyWith(
                   color: colorScheme.onSurfaceVariant,
                 ),
               ),
             ),
-            Flexible(
-              child: FutureBuilder<List<CrossExtensionShareResult>>(
-                future: _future,
-                builder: (context, snapshot) {
-                  if (snapshot.connectionState != ConnectionState.done) {
-                    return const SizedBox(
-                      height: 180,
-                      child: Center(child: CircularProgressIndicator()),
-                    );
-                  }
+          );
+        }
 
-                  final results = snapshot.data ?? const [];
-                  if (results.isEmpty) {
-                    return SizedBox(
-                      height: 180,
-                      child: Center(
-                        child: Text(
-                          context.l10n.shareSheetNoExtensions,
-                          style: textTheme.bodyMedium?.copyWith(
-                            color: colorScheme.onSurfaceVariant,
-                          ),
-                        ),
-                      ),
-                    );
-                  }
-
-                  return ListView.builder(
-                    shrinkWrap: true,
-                    padding: const EdgeInsets.only(bottom: 16, top: 4),
-                    itemBuilder: (context, index) {
-                      final result = results[index];
-                      return _CrossExtensionShareTile(
-                        result: result,
-                        iconPath: _iconPathFor(result.extensionId),
-                      );
-                    },
-                    itemCount: results.length,
-                  );
-                },
-              ),
-            ),
-          ],
-        ),
-      ),
+        return ListView.builder(
+          shrinkWrap: true,
+          padding: const EdgeInsets.only(bottom: 16, top: 4),
+          itemBuilder: (context, index) {
+            final result = results[index];
+            return _CrossExtensionShareTile(
+              result: result,
+              iconPath: _iconPathFor(result.extensionId),
+            );
+          },
+          itemCount: results.length,
+        );
+      },
     );
   }
 }

lib/widgets/download_service_picker.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:io';
 import 'package:flutter/material.dart';
+import 'package:spotiflac_android/widgets/app_bottom_sheet.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:spotiflac_android/providers/extension_provider.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
@@ -40,9 +41,6 @@ class DownloadServicePicker extends ConsumerStatefulWidget {
       context: context,
       useRootNavigator: true,
       backgroundColor: colorScheme.surfaceContainerHigh,
-      shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
-      ),
       isScrollControlled: true,
       builder: (context) => DownloadServicePicker(
         trackName: trackName,
@@ -137,17 +135,7 @@ class _DownloadServicePickerState extends ConsumerState<DownloadServicePicker> {
                 color: colorScheme.outlineVariant.withValues(alpha: 0.5),
               ),
             ] else ...[
-              const SizedBox(height: 8),
-              Center(
-                child: Container(
-                  width: 40,
-                  height: 4,
-                  decoration: BoxDecoration(
-                    color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4),
-                    borderRadius: BorderRadius.circular(2),
-                  ),
-                ),
-              ),
+              const AppSheetHandle(),
             ],
 
             Padding(
@@ -517,15 +505,7 @@ class _TrackInfoHeaderState extends State<_TrackInfoHeader> {
         ),
         child: Column(
           children: [
-            const SizedBox(height: 8),
-            Container(
-              width: 40,
-              height: 4,
-              decoration: BoxDecoration(
-                color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4),
-                borderRadius: BorderRadius.circular(2),
-              ),
-            ),
+            const AppSheetHandle(),
             Padding(
               padding: const EdgeInsets.fromLTRB(16, 12, 16, 12),
               child: Row(

lib/widgets/duplicate_review_sheet.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:spotiflac_android/widgets/app_bottom_sheet.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:path/path.dart' as p;
 import 'package:spotiflac_android/l10n/l10n.dart';
@@ -18,14 +19,12 @@ class DuplicateReviewSheet extends ConsumerStatefulWidget {
 
   static Future<void> show(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
-    return showModalBottomSheet<void>(
+    return showAppBottomSheet<void>(
       context: context,
       useRootNavigator: true,
-      isScrollControlled: true,
       backgroundColor: colorScheme.surfaceContainerHigh,
-      shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
-      ),
+      title: context.l10n.duplicatesTitle,
+      maxHeightFactor: 0.85,
       builder: (_) => const DuplicateReviewSheet(),
     );
   }
@@ -154,76 +153,39 @@ class _DuplicateReviewSheetState extends ConsumerState<DuplicateReviewSheet> {
   @override
   Widget build(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
-    return SafeArea(
-      child: ConstrainedBox(
-        constraints: BoxConstraints(
-          maxHeight: MediaQuery.sizeOf(context).height * 0.85,
-        ),
-        child: Column(
-          mainAxisSize: MainAxisSize.min,
-          children: [
-            const SizedBox(height: 8),
-            Center(
-              child: Container(
-                width: 40,
-                height: 4,
-                decoration: BoxDecoration(
-                  color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4),
-                  borderRadius: BorderRadius.circular(2),
-                ),
+    return FutureBuilder<List<IsrcDuplicateGroup>>(
+      future: _groupsFuture,
+      builder: (context, snapshot) {
+        if (snapshot.connectionState != ConnectionState.done) {
+          return const Padding(
+            padding: EdgeInsets.all(32),
+            child: Center(child: CircularProgressIndicator()),
+          );
+        }
+        final groups = snapshot.data ?? const [];
+        if (groups.isEmpty) {
+          return Padding(
+            padding: const EdgeInsets.fromLTRB(24, 8, 24, 32),
+            child: Text(
+              context.l10n.duplicatesEmpty,
+              style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                color: colorScheme.onSurfaceVariant,
               ),
             ),
-            Padding(
-              padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-              child: Align(
-                alignment: Alignment.centerLeft,
-                child: Text(
-                  context.l10n.duplicatesTitle,
-                  style: Theme.of(context).textTheme.titleMedium?.copyWith(
-                    fontWeight: FontWeight.w600,
-                  ),
-                ),
-              ),
-            ),
-            Flexible(
-              child: FutureBuilder<List<IsrcDuplicateGroup>>(
-                future: _groupsFuture,
-                builder: (context, snapshot) {
-                  if (snapshot.connectionState != ConnectionState.done) {
-                    return const Padding(
-                      padding: EdgeInsets.all(32),
-                      child: Center(child: CircularProgressIndicator()),
-                    );
-                  }
-                  final groups = snapshot.data ?? const [];
-                  if (groups.isEmpty) {
-                    return Padding(
-                      padding: const EdgeInsets.fromLTRB(24, 8, 24, 32),
-                      child: Text(
-                        context.l10n.duplicatesEmpty,
-                        style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-                          color: colorScheme.onSurfaceVariant,
-                        ),
-                      ),
-                    );
-                  }
-                  // shrinkWrap keeps a small sheet compact but builds every
-                  // group eagerly; past a screenful, switch to a lazy
-                  // full-height list so a large duplicate set can't jank the
-                  // opening frame.
-                  final compact = groups.length <= 12;
-                  return ListView.builder(
-                    shrinkWrap: compact,
-                    itemCount: groups.length,
-                    itemBuilder: (context, index) =>
-                        _buildGroup(context, colorScheme, groups[index]),
-                  );
-                },
-              ),
-            ),
-          ],
-        ),
-      ),
+          );
+        }
+        // shrinkWrap keeps a small sheet compact but builds every
+        // group eagerly; past a screenful, switch to a lazy
+        // full-height list so a large duplicate set can't jank the
+        // opening frame.
+        final compact = groups.length <= 12;
+        return ListView.builder(
+          shrinkWrap: compact,
+          itemCount: groups.length,
+          itemBuilder: (context, index) =>
+              _buildGroup(context, colorScheme, groups[index]),
+        );
+      },
     );
   }
 

lib/widgets/open_on_platform_sheet.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:spotiflac_android/widgets/app_bottom_sheet.dart';
 import 'package:flutter/services.dart';
 import 'package:spotiflac_android/l10n/l10n.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
@@ -20,13 +21,12 @@ class OpenOnPlatformSheet extends StatelessWidget {
     String isrc = '',
   }) {
     final colorScheme = Theme.of(context).colorScheme;
-    return showModalBottomSheet<void>(
+    return showAppBottomSheet<void>(
       context: context,
       useRootNavigator: true,
       backgroundColor: colorScheme.surfaceContainerHigh,
-      shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
-      ),
+      title: context.l10n.trackOpenOn,
+      maxHeightFactor: 0.7,
       builder: (_) => OpenOnPlatformSheet(spotifyId: spotifyId, isrc: isrc),
     );
   }
@@ -82,94 +82,54 @@ class OpenOnPlatformSheet extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
-    return SafeArea(
-      child: ConstrainedBox(
-        constraints: BoxConstraints(
-          maxHeight: MediaQuery.sizeOf(context).height * 0.7,
-        ),
-        child: Column(
-          mainAxisSize: MainAxisSize.min,
-          children: [
-            const SizedBox(height: 8),
-            Center(
-              child: Container(
-                width: 40,
-                height: 4,
-                decoration: BoxDecoration(
-                  color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4),
-                  borderRadius: BorderRadius.circular(2),
-                ),
-              ),
-            ),
-            Padding(
-              padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-              child: Align(
-                alignment: Alignment.centerLeft,
-                child: Text(
-                  context.l10n.trackOpenOn,
-                  style: Theme.of(context).textTheme.titleMedium?.copyWith(
-                    fontWeight: FontWeight.w600,
-                  ),
-                ),
-              ),
-            ),
-            Flexible(
-              child: FutureBuilder<Map<String, String>>(
-                future: PlatformBridge.getTrackPlatformLinks(
-                  spotifyId: spotifyId,
-                  isrc: isrc,
-                ),
-                builder: (context, snapshot) {
-                  if (snapshot.connectionState != ConnectionState.done) {
-                    return const Padding(
-                      padding: EdgeInsets.all(32),
-                      child: Center(child: CircularProgressIndicator()),
-                    );
-                  }
-                  final links = snapshot.data ?? const <String, String>{};
-                  if (links.isEmpty) {
-                    return Padding(
-                      padding: const EdgeInsets.fromLTRB(24, 8, 24, 32),
-                      child: Text(
-                        context.l10n.trackOpenOnNoLinks,
-                        style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-                          color: colorScheme.onSurfaceVariant,
-                        ),
-                      ),
-                    );
-                  }
-                  final entries = links.entries.toList()
-                    ..sort(
-                      (a, b) =>
-                          _displayName(a.key).compareTo(_displayName(b.key)),
-                    );
-                  return SingleChildScrollView(
-                    child: Column(
-                      children: [
-                        SettingsGroup(
-                          children: [
-                            for (final entry in entries)
-                              ListTile(
-                                title: Text(_displayName(entry.key)),
-                                trailing: Icon(
-                                  Icons.open_in_new,
-                                  size: 18,
-                                  color: colorScheme.onSurfaceVariant,
-                                ),
-                                onTap: () => _openLink(context, entry.value),
-                              ),
-                          ],
-                        ),
-                        const SizedBox(height: 16),
-                      ],
-                    ),
-                  );
-                },
-              ),
-            ),
-          ],
-        ),
+    return FutureBuilder<Map<String, String>>(
+      future: PlatformBridge.getTrackPlatformLinks(
+        spotifyId: spotifyId,
+        isrc: isrc,
       ),
+      builder: (context, snapshot) {
+        if (snapshot.connectionState != ConnectionState.done) {
+          return const Padding(
+            padding: EdgeInsets.all(32),
+            child: Center(child: CircularProgressIndicator()),
+          );
+        }
+        final links = snapshot.data ?? const <String, String>{};
+        if (links.isEmpty) {
+          return Padding(
+            padding: const EdgeInsets.fromLTRB(24, 8, 24, 32),
+            child: Text(
+              context.l10n.trackOpenOnNoLinks,
+              style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                color: colorScheme.onSurfaceVariant,
+              ),
+            ),
+          );
+        }
+        final entries = links.entries.toList()
+          ..sort((a, b) => _displayName(a.key).compareTo(_displayName(b.key)));
+        return SingleChildScrollView(
+          child: Column(
+            children: [
+              SettingsGroup(
+                children: [
+                  for (final entry in entries)
+                    ListTile(
+                      title: Text(_displayName(entry.key)),
+                      trailing: Icon(
+                        Icons.open_in_new,
+                        size: 18,
+                        color: colorScheme.onSurfaceVariant,
+                      ),
+                      onTap: () => _openLink(context, entry.value),
+                    ),
+                ],
+              ),
+              const SizedBox(height: 16),
+            ],
+          ),
+        );
+      },
     );
   }
 }

lib/widgets/track_collection_quick_actions.dart

@@ -1,5 +1,6 @@
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:flutter/material.dart';
+import 'package:spotiflac_android/widgets/app_bottom_sheet.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:spotiflac_android/l10n/l10n.dart';
 import 'package:spotiflac_android/models/track.dart';
@@ -34,9 +35,6 @@ class TrackCollectionQuickActions extends ConsumerWidget {
       useRootNavigator: true,
       isScrollControlled: true,
       backgroundColor: colorScheme.surfaceContainerHigh,
-      shape: const RoundedRectangleBorder(
-        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
-      ),
       builder: (sheetContext) => _TrackOptionsSheet(
         track: track,
         hasLocalPlaybackCandidate: hasLocalPlaybackCandidate,
@@ -62,7 +60,7 @@ class TrackCollectionQuickActions extends ConsumerWidget {
         hasLocalPlaybackCandidate: hasLocalPlaybackCandidate,
       ),
       padding: const EdgeInsets.only(left: 12),
-      constraints: const BoxConstraints(minWidth: 36, minHeight: 36),
+      constraints: const BoxConstraints(minWidth: 48, minHeight: 48),
     );
   }
 }
@@ -105,17 +103,7 @@ class _TrackOptionsSheet extends ConsumerWidget {
             children: [
               Column(
                 children: [
-                  const SizedBox(height: 8),
-                  Container(
-                    width: 40,
-                    height: 4,
-                    decoration: BoxDecoration(
-                      color: colorScheme.onSurfaceVariant.withValues(
-                        alpha: 0.4,
-                      ),
-                      borderRadius: BorderRadius.circular(2),
-                    ),
-                  ),
+                  const AppSheetHandle(),
                   Padding(
                     padding: const EdgeInsets.fromLTRB(16, 12, 16, 12),
                     child: Row(