address mobile review feedback

Signed-off-by: kenny lopez <klopez4212@gmail.com>

mobile/lib/features/channels/channels_page/community.dart

@@ -143,13 +143,29 @@ class _CommunitySwitcherSheet extends HookConsumerWidget {
                                         Navigator.of(context).pop();
                                       }
                                     },
-                              onRemove: () => _confirmRemoveCommunity(
-                                context,
-                                ref,
-                                communities[index],
-                                closeSheetAfterRemoval:
-                                    communities[index].id == activeId,
-                              ),
+                              onRemove: () {
+                                final community = communities[index];
+                                final nextCommunity = community.id == activeId
+                                    ? communities
+                                          .where(
+                                            (candidate) =>
+                                                candidate.id != community.id,
+                                          )
+                                          .firstOrNull
+                                    : null;
+                                unawaited(
+                                  _confirmRemoveCommunity(
+                                    context,
+                                    ref,
+                                    community,
+                                    closeSheetAfterRemoval:
+                                        community.id == activeId,
+                                    nextCommunityId: nextCommunity?.id,
+                                    onCommunitySwitchStart:
+                                        onCommunitySwitchStart,
+                                  ),
+                                );
+                              },
                             ),
                           ],
                           if (communities.isNotEmpty)
@@ -447,6 +463,8 @@ Future<void> _confirmRemoveCommunity(
   WidgetRef ref,
   Community community, {
   required bool closeSheetAfterRemoval,
+  required String? nextCommunityId,
+  ValueChanged<String?>? onCommunitySwitchStart,
 }) async {
   final confirmed = await showDialog<bool>(
     context: context,
@@ -473,6 +491,7 @@ Future<void> _confirmRemoveCommunity(
   if (confirmed != true || !context.mounted) return;
 
   final messenger = ScaffoldMessenger.of(context);
+  onCommunitySwitchStart?.call(nextCommunityId);
   try {
     await ref
         .read(communityListProvider.notifier)
@@ -481,6 +500,7 @@ Future<void> _confirmRemoveCommunity(
       Navigator.of(context).pop();
     }
   } catch (e) {
+    onCommunitySwitchStart?.call(null);
     messenger.showSnackBar(
       SnackBar(content: Text('Failed to remove community: $e')),
     );

mobile/lib/shared/widgets/frosted_app_bar.dart

@@ -4,30 +4,12 @@ import 'package:flutter/material.dart';
 import 'package:lucide_icons_flutter/lucide_icons.dart';
 
 import '../theme/theme.dart';
+import 'frosted_header_scroll_state.dart';
 
 /// Minimum height of the frosted app bar content area below the safe area.
 const _kBarContentMinHeight = Grid.xxs + 32 + Grid.xxs; // 48
 const _kBottomBorderWidth = 1.0;
 
-/// Shares the scroll elevation state from [FrostedScaffold] with its header.
-/// Keeping this separate lets all of the existing page bodies continue to own
-/// their scroll views.
-class FrostedHeaderScrollState extends InheritedNotifier<ValueNotifier<bool>> {
-  const FrostedHeaderScrollState({
-    required super.notifier,
-    required super.child,
-    super.key,
-  });
-
-  static bool isScrolledOf(BuildContext context) {
-    return context
-            .dependOnInheritedWidgetOfExactType<FrostedHeaderScrollState>()
-            ?.notifier
-            ?.value ??
-        false;
-  }
-}
-
 TextStyle _effectiveTitleStyle(BuildContext context, TextStyle? titleStyle) {
   final baseStyle =
       context.textTheme.titleMedium ??

mobile/lib/shared/widgets/frosted_header_scroll_state.dart

@@ -0,0 +1,20 @@
+import 'package:flutter/material.dart';
+
+/// Shares the scroll elevation state from [FrostedScaffold] with its header.
+/// Keeping this separate lets all of the existing page bodies continue to own
+/// their scroll views.
+class FrostedHeaderScrollState extends InheritedNotifier<ValueNotifier<bool>> {
+  const FrostedHeaderScrollState({
+    required super.notifier,
+    required super.child,
+    super.key,
+  });
+
+  static bool isScrolledOf(BuildContext context) {
+    return context
+            .dependOnInheritedWidgetOfExactType<FrostedHeaderScrollState>()
+            ?.notifier
+            ?.value ??
+        false;
+  }
+}

mobile/lib/shared/widgets/frosted_scaffold.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
 
 import 'frosted_app_bar.dart';
+import 'frosted_header_scroll_state.dart';
 
 /// A convenience [Scaffold] that overlays a [FrostedAppBar] on top of its body.
 ///