added community screen as placeholder for now 2

lib/ui/community/community_screen.dart

@@ -0,0 +1,39 @@
+import 'package:flutter/material.dart';
+
+/// Community screen placeholder.
+class CommunityScreen extends StatelessWidget {
+  const CommunityScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Community'),
+        elevation: 0,
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            Icon(Icons.people_outline, size: 64, color: Colors.grey.shade400),
+            const SizedBox(height: 16),
+            Text(
+              'Community',
+              style: Theme.of(context).textTheme.titleLarge?.copyWith(
+                color: Colors.grey.shade700,
+              ),
+            ),
+            const SizedBox(height: 8),
+            Text(
+              'Coming soon...',
+              style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                color: Colors.grey.shade600,
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+