Show community avatar in QR agent creation form

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

mobile/lib/prototype/README.md

@@ -50,7 +50,7 @@ prototype's 1–64 letter/number/space/dot/hyphen/underscore contract.
 Both cold-start Camera links and warm external hyperlinks use the existing
 app-link queue. Dispatch waits for signed-in app/account and current-community
 hydration. Name and instructions are editable, avatar is read-only, and the
-header names the destination community. A community change prevents submission.
+form shows the destination community avatar without a community-name heading. A community change prevents submission.
 Only the default remote provider is used. No QR signing or QR-generator UI is
 included. Signed-out users must sign in and reopen the link; unfinished agent
 setup must be resumed before opening a new draft.

mobile/lib/prototype/create_agent_sheet.dart

@@ -4,6 +4,7 @@ import 'package:hooks_riverpod/hooks_riverpod.dart';
 
 import '../shared/community/community.dart';
 import '../shared/community/community_provider.dart';
+import '../shared/community/community_avatar.dart';
 import '../shared/deeplink/deep_link.dart';
 import '../shared/theme/theme.dart';
 import '../shared/widgets/buzz_titled_sheet_layout.dart';
@@ -137,9 +138,7 @@ class CreatePrototypeAgentSheet extends HookConsumerWidget {
           bottom: MediaQuery.viewInsetsOf(context).bottom,
         ),
         child: BuzzTitledSheetLayout(
-          title: avatar == null
-              ? 'Create agent'
-              : 'Create in ${community.name}',
+          title: 'Create agent',
           leading: IconButton(
             tooltip: 'Cancel',
             style: actionStyle,
@@ -169,6 +168,18 @@ class CreatePrototypeAgentSheet extends HookConsumerWidget {
               crossAxisAlignment: CrossAxisAlignment.start,
               children: [
                 if (avatarUrl != null) ...[
+                  Align(
+                    alignment: Alignment.centerRight,
+                    child: Semantics(
+                      label: 'Current community: ${community.name}',
+                      child: CommunityAvatar(
+                        name: community.name,
+                        relayUrl: community.relayUrl,
+                        size: Grid.md,
+                      ),
+                    ),
+                  ),
+                  const SizedBox(height: Grid.xs),
                   Center(
                     child: AvatarImage(
                       imageUrl: avatarUrl,

mobile/test/prototype/agent_link_surface_test.dart

@@ -6,6 +6,7 @@ import 'package:buzz/prototype/create_agent_sheet.dart';
 import 'package:buzz/prototype/remote_agent_controller.dart';
 import 'package:buzz/shared/agents/agents_surface.dart';
 import 'package:buzz/shared/community/community.dart';
+import 'package:buzz/shared/community/community_avatar.dart';
 import 'package:buzz/shared/community/community_provider.dart';
 import 'package:buzz/shared/deeplink/deep_link.dart';
 import 'package:buzz/shared/deeplink/pending_deep_link_provider.dart';
@@ -122,7 +123,13 @@ void main() {
           ),
         );
         await tester.pumpAndSettle();
-        expect(find.text('Create in Test community'), findsOneWidget);
+        expect(find.text('Create agent'), findsOneWidget);
+        expect(find.text('Create in Test community'), findsNothing);
+        final indicator = tester.widget<CommunityAvatar>(
+          find.byType(CommunityAvatar),
+        );
+        expect(indicator.name, 'Test community');
+        expect(indicator.relayUrl, 'wss://test.example');
         expect(find.byType(AvatarImage), findsOneWidget);
         expect(controller.submittedName, isNull);
         await tester.enterText(