fix(mobile): simplify notification settings (#8199)

Keep notification settings as a separate card with a single
“Notifications” toggle. Remove the section heading, bell, all subtitles
(including permission/capability and pending opt-out messages), and the
iOS settings button.

Toggle callbacks, capability visibility, persisted opt-in/out, and relay
synchronization are unchanged. The disable failure is being investigated
separately. This intentionally removes the pending warning rather than
claiming to fix synchronization. Tom explicitly requested removal of the
immediate opt-out synchronization warning and all other status text;
this is an intentional exception to the pending-feedback guidance in
VISION_MOBILE.md. [Codex’s finding is answered against that agreed
scope](https://github.com/block/buzz/pull/8199#discussion_r4225426842).

No new tests. Delete tests for the removed permission/settings UI and
remove obsolete display assertions from existing recovery tests while
preserving their opt-out synchronization coverage.

Closest related issue:
[#7826](https://github.com/block/buzz/issues/7826). No duplicate cleanup
PR found.

### Validation

Mobile formatting/static analysis passed. The full existing mobile suite
passed (3,216 tests; 4 skipped), plus the three unconfigured-build tests
and gateway recipe checks. Existing opt-out recovery tests exercised the
switch, persisted tombstone, snapshot synchronization, and successful
relay retry.

Before/after renders use the existing Flutter widget fixture with
synthetic data and mocked native navigation. No simulator or TestFlight
run was performed. After merge, validate the settings row and on/off
flow in the next iOS candidate; remote disable failure remains a
separate investigation.

GitHub CI also passed the mobile tests, unconfigured-build tests, and
gateway recipe checks. The [security
review](https://github.com/block/buzz/actions/runs/37863885299)
completed successfully. The [Android
build](https://github.com/block/buzz/actions/runs/37863554077/job/113605025305)
passed. The iOS simulator build, native accessibility checks, and
unsigned iOS release build passed. [All required CI
checks](https://github.com/block/buzz/actions/runs/37863554077) are
green.

### Before and after

Headless Flutter widget fixture, with synthetic data and mocked native
navigation.

| Before | After |
| --- | --- |
| ![Notification settings
before](https://raw.githubusercontent.com/block/buzz/8334767435a2896656df7bcc497dcb64a1846d92/pr-8199--before.png)
| ![Notification settings
after](https://raw.githubusercontent.com/block/buzz/8334767435a2896656df7bcc497dcb64a1846d92/pr-8199--after.png)
|

Signed-off-by: Tom Brow <tomb@block.xyz>

mobile/test/features/settings/notification_recovery_test.dart

@@ -61,7 +61,6 @@ void main() {
       final pending = Completer<BuzzPushLeaseDescriptor?>();
       final snapshots = <List<Community>>[];
       final tombstones = <int?>[];
-      var settingsOpened = 0;
       var relayAvailable = false;
       await tester.pumpWidget(
         ProviderScope(
@@ -90,12 +89,6 @@ void main() {
             buzzPushAuthorizationStatusReaderProvider.overrideWithValue(
               () async => BuzzPushAuthorizationStatus.denied,
             ),
-            buzzPushNotificationSettingsOpenerProvider.overrideWithValue(
-              () async {
-                settingsOpened++;
-                return true;
-              },
-            ),
           ],
           child: MaterialApp(
             theme: AppTheme.light(),
@@ -117,17 +110,6 @@ void main() {
             '${container.read(activeCommunityProvider)} / ${container.read(communityListProvider)}',
       );
       expect(tester.widget<Switch>(find.byType(Switch)).value, isTrue);
-      expect(
-        find.text(
-          'Push support unavailable; you can still turn notifications off',
-        ),
-        findsOneWidget,
-      );
-      await tester.tap(
-        find.byKey(const ValueKey('push-notifications-open-settings')),
-      );
-      await tester.pump();
-      expect(settingsOpened, 1);
       await tester.tap(find.byType(Switch));
       await tester.pumpAndSettle();
       final stored = (await storage.loadAll()).single;
@@ -135,18 +117,9 @@ void main() {
       expect(stored.pushSubscriptionState.pendingTombstoneGeneration, 8);
       expect(tombstones, [8]);
       expect(snapshots.last.single.pushNotificationsEnabled, isFalse);
-      expect(
-        find.text('Waiting for relay confirmation; notifications may continue'),
-        findsOneWidget,
-      );
       final offSwitch = tester.widget<Switch>(find.byType(Switch));
       expect(offSwitch.value, isFalse);
       expect(offSwitch.onChanged, isNull);
-      await tester.tap(
-        find.byKey(const ValueKey('push-notifications-open-settings')),
-      );
-      await tester.pump();
-      expect(settingsOpened, 2);
       relayAvailable = true;
       await container
           .read(communityListProvider.notifier)

mobile/test/features/settings/settings_page_test.dart

@@ -194,109 +194,6 @@ void main() {
     debugDefaultTargetPlatformOverride = null;
   });
 
-  testWidgets('shows denied display permission and opens iOS settings', (
-    tester,
-  ) async {
-    debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
-    addTearDown(() => debugDefaultTargetPlatformOverride = null);
-    SharedPreferences.setMockInitialValues({});
-    final prefs = await SharedPreferences.getInstance();
-    final community = Community.create(
-      name: 'Team',
-      relayUrl: 'wss://relay.example',
-    ).copyWith(pushNotificationsEnabled: true);
-    var openSettingsCalls = 0;
-
-    await tester.pumpWidget(
-      ProviderScope(
-        overrides: [
-          savedPrefsProvider.overrideWithValue(prefs),
-          activeCommunityProvider.overrideWith((ref) async => community),
-          currentRelayPushDescriptorProvider.overrideWith(
-            (ref) async => _pushDescriptor,
-          ),
-          appLifecycleProvider.overrideWith(_SettingsLifecycleNotifier.new),
-          buzzPushAuthorizationStatusReaderProvider.overrideWithValue(
-            () async => BuzzPushAuthorizationStatus.denied,
-          ),
-          buzzPushNotificationSettingsOpenerProvider.overrideWithValue(
-            () async {
-              openSettingsCalls += 1;
-              return true;
-            },
-          ),
-        ],
-        child: MaterialApp(
-          theme: AppTheme.light(),
-          home: SettingsPage(
-            profileHeader: const SizedBox.shrink(),
-            identityRecoveryPageBuilder: (_) => const SizedBox.shrink(),
-          ),
-        ),
-      ),
-    );
-    await tester.pumpAndSettle();
-
-    expect(tester.widget<Switch>(find.byType(Switch)).value, isTrue);
-    expect(
-      find.text('Enabled in Buzz, but disabled in iOS Settings'),
-      findsOneWidget,
-    );
-    await tester.tap(
-      find.byKey(const ValueKey('push-notifications-open-settings')),
-    );
-    await tester.pump();
-    expect(openSettingsCalls, 1);
-    debugDefaultTargetPlatformOverride = null;
-  });
-
-  testWidgets('shows permission lookup errors with settings recovery', (
-    tester,
-  ) async {
-    debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
-    addTearDown(() => debugDefaultTargetPlatformOverride = null);
-    SharedPreferences.setMockInitialValues({});
-    final prefs = await SharedPreferences.getInstance();
-    final community = Community.create(
-      name: 'Team',
-      relayUrl: 'wss://relay.example',
-    ).copyWith(pushNotificationsEnabled: true);
-
-    await tester.pumpWidget(
-      ProviderScope(
-        overrides: [
-          savedPrefsProvider.overrideWithValue(prefs),
-          activeCommunityProvider.overrideWith((ref) async => community),
-          currentRelayPushDescriptorProvider.overrideWith(
-            (ref) async => _pushDescriptor,
-          ),
-          appLifecycleProvider.overrideWith(_SettingsLifecycleNotifier.new),
-          buzzPushAuthorizationStatusReaderProvider.overrideWithValue(
-            () async => throw StateError('authorization unavailable'),
-          ),
-        ],
-        child: MaterialApp(
-          theme: AppTheme.light(),
-          home: SettingsPage(
-            profileHeader: const SizedBox.shrink(),
-            identityRecoveryPageBuilder: (_) => const SizedBox.shrink(),
-          ),
-        ),
-      ),
-    );
-    await tester.pumpAndSettle();
-
-    expect(
-      find.text('Enabled in Buzz; iOS permission status unavailable'),
-      findsOneWidget,
-    );
-    expect(
-      find.byKey(const ValueKey('push-notifications-open-settings')),
-      findsOneWidget,
-    );
-    debugDefaultTargetPlatformOverride = null;
-  });
-
   for (final brightness in Brightness.values) {
     testWidgets(
       'shows status above profile editing and routes photo directly in ${brightness.name}',