DiscoverScreen: match Thread screen AppBar (back, title, home/chat actions)

sojorn_app/lib/screens/discover/discover_screen.dart

@@ -13,6 +13,10 @@ import '../profile/viewable_profile_screen.dart';
 import '../compose/compose_screen.dart';
 import '../post/post_detail_screen.dart';
 import 'package:shared_preferences/shared_preferences.dart';
+import 'package:go_router/go_router.dart';
+import 'package:google_fonts/google_fonts.dart';
+import '../secure_chat/secure_chat_full_screen.dart';
+import '../../providers/notification_provider.dart';
 
 /// Model for discover page data
 class DiscoverData {
@@ -278,8 +282,56 @@ class _DiscoverScreenState extends ConsumerState<DiscoverScreen> {
   Widget build(BuildContext context) {
     return Scaffold(
       backgroundColor: AppTheme.scaffoldBg,
-      body: SafeArea(
+      appBar: AppBar(
-        child: Column(
+        backgroundColor: AppTheme.scaffoldBg,
+        elevation: 0,
+        surfaceTintColor: Colors.transparent,
+        leading: IconButton(
+          onPressed: () {
+            if (Navigator.of(context).canPop()) {
+              Navigator.of(context).pop();
+            } else {
+              context.go('/home');
+            }
+          },
+          icon: Icon(Icons.arrow_back, color: AppTheme.navyBlue),
+        ),
+        title: Text(
+          'Search',
+          style: GoogleFonts.inter(
+            color: AppTheme.textPrimary,
+            fontSize: 18,
+            fontWeight: FontWeight.w700,
+          ),
+        ),
+        actions: [
+          IconButton(
+            onPressed: () => context.go('/home'),
+            icon: Icon(Icons.home_outlined, color: AppTheme.navyBlue),
+          ),
+          IconButton(
+            onPressed: () => Navigator.of(context, rootNavigator: true).push(
+              MaterialPageRoute(
+                builder: (_) => const SecureChatFullScreen(),
+                fullscreenDialog: true,
+              ),
+            ),
+            icon: Consumer(
+              builder: (context, ref, child) {
+                final badge = ref.watch(currentBadgeProvider);
+                return Badge(
+                  label: Text(badge.messageCount.toString()),
+                  isLabelVisible: badge.messageCount > 0,
+                  backgroundColor: AppTheme.brightNavy,
+                  child: Icon(Icons.chat_bubble_outline, color: AppTheme.navyBlue),
+                );
+              },
+            ),
+          ),
+          const SizedBox(width: 8),
+        ],
+      ),
+      body: Column(
         children: [
           _buildHeader(),
           Expanded(
@@ -287,7 +339,6 @@ class _DiscoverScreenState extends ConsumerState<DiscoverScreen> {
           ),
         ],
       ),
-      ),
     );
   }