fix(mobile): confirm before starting a Huddle from the header

mobile/ios/Runner/NativeConfirmationDialog.swift

@@ -1,7 +1,7 @@
 import Flutter
 import UIKit
 
-/// Owns a destructive UIKit alert until dismissal and replies exactly once.
+/// Owns a UIKit confirmation alert until dismissal and replies exactly once.
 final class NativeConfirmationDialogCoordinator: NSObject {
   private let channel: FlutterMethodChannel
   private weak var parent: UIViewController?
@@ -46,7 +46,8 @@ final class NativeConfirmationDialogCoordinator: NSObject {
     alert.addAction(UIAlertAction(title: cancelLabel, style: .cancel) { [weak self] _ in
       self?.cancel()
     })
-    alert.addAction(UIAlertAction(title: confirmLabel, style: .destructive) { [weak self] _ in
+    let destructive = data["destructive"] as? Bool ?? true
+    alert.addAction(UIAlertAction(title: confirmLabel, style: destructive ? .destructive : .default) { [weak self] _ in
       self?.finish(true)
     })
     pendingResult = result

mobile/lib/features/channels/channel_detail_page.dart

@@ -6,6 +6,7 @@ import 'bestie_welcome.dart';
 import 'bestie_welcome_storage.dart';
 import 'agent_reply_handoff.dart';
 import 'huddle_timeline.dart';
+import '../../shared/widgets/confirmation_dialog.dart';
 import '../../shared/widgets/modal_presentation.dart';
 import '../../shared/widgets/ios_scroll_to_top.dart';
 import 'message_footer_layout.dart';

mobile/lib/features/channels/channel_detail_page/huddle_sheet.dart

@@ -243,6 +243,15 @@ IosNavigationAction _huddleNavigationAction(
               );
               return;
             }
+            // The header button is easy to hit by accident, so a new call asks first.
+            final confirmed = await showConfirmation(
+              context: context,
+              title: 'Start a Huddle?',
+              message:
+                  'Your microphone will turn on, and others in this conversation can join.',
+              confirmLabel: 'Start Huddle',
+            );
+            if (!confirmed || !context.mounted) return;
             try {
               await ref
                   .read(mobileHuddleControllerProvider.notifier)

mobile/lib/shared/widgets/confirmation_dialog.dart

@@ -12,6 +12,22 @@ Future<bool> showDestructiveConfirmation({
   required String title,
   required String message,
   required String confirmLabel,
+}) => showConfirmation(
+  context: context,
+  title: title,
+  message: message,
+  confirmLabel: confirmLabel,
+  destructive: true,
+);
+
+/// Confirms an action using a UIKit alert on iOS.
+/// Returns true only when the person explicitly chooses the confirm action.
+Future<bool> showConfirmation({
+  required BuildContext context,
+  required String title,
+  required String message,
+  required String confirmLabel,
+  bool destructive = false,
 }) async {
   if (!kIsWeb && defaultTargetPlatform == TargetPlatform.iOS) {
     return await const MethodChannel(
@@ -21,6 +37,7 @@ Future<bool> showDestructiveConfirmation({
           'message': message,
           'confirmLabel': confirmLabel,
           'cancelLabel': 'Cancel',
+          'destructive': destructive,
           'dark': context.theme.brightness == Brightness.dark,
         }) ==
         true;
@@ -37,9 +54,11 @@ Future<bool> showDestructiveConfirmation({
             ),
             FilledButton(
               onPressed: () => Navigator.of(dialogContext).pop(true),
-              style: FilledButton.styleFrom(
-                backgroundColor: context.colors.error,
-              ),
+              style: destructive
+                  ? FilledButton.styleFrom(
+                      backgroundColor: context.colors.error,
+                    )
+                  : null,
               child: Text(confirmLabel),
             ),
           ],

mobile/test/features/channels/channel_detail_page_test.dart

@@ -9529,7 +9529,19 @@ void main() {
         );
         await tester.pumpAndSettle();
 
+        // A stray tap asks first; Cancel leaves no Huddle behind.
         await tester.tap(find.byKey(const ValueKey('channel-huddle-button')));
+        await tester.pumpAndSettle();
+        expect(find.text('Start a Huddle?'), findsOneWidget);
+        await tester.tap(find.widgetWithText(TextButton, 'Cancel'));
+        await tester.pumpAndSettle();
+        expect(find.text('Start a Huddle?'), findsNothing);
+        expect(relaySession.huddleCreatePublishStarted.isCompleted, isFalse);
+
+        await tester.tap(find.byKey(const ValueKey('channel-huddle-button')));
+        await tester.pumpAndSettle();
+        await tester.tap(find.widgetWithText(FilledButton, 'Start Huddle'));
+        await tester.pump();
         await relaySession.huddleCreatePublishStarted.future;
         var transitionCompleted = false;
         final transition =

mobile/test/features/channels/channel_member_profile_actions_test.dart

@@ -200,6 +200,7 @@ void main() {
         );
         expect(calls.single.arguments, containsPair('confirmLabel', 'Remove'));
         expect(calls.single.arguments, containsPair('cancelLabel', 'Cancel'));
+        expect(calls.single.arguments, containsPair('destructive', true));
         expect(find.byType(AlertDialog), findsNothing);
         expect(actions.calls, isEmpty);
         response.complete(confirmed);