feat: gesture back improvement

frontend/lib/main.dart

@@ -129,7 +129,12 @@ class _LandingPageState extends State<LandingPage> {
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
+    return WillPopScope(
+      onWillPop: () async {
+        // Prevent back navigation from landing page
+        return false;
+      },
+      child: Scaffold(
       body: Stack(
         children: [
           // Background gradient
@@ -234,6 +239,7 @@ class _LandingPageState extends State<LandingPage> {
           ),
         ],
       ),
+      ),
     );
   }
 }
@@ -373,8 +379,13 @@ class _SignInPageState extends State<SignInPage> {
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
+    return WillPopScope(
-      body: Container(
+      onWillPop: () async {
+        // Prevent back navigation from sign in page
+        return false;
+      },
+      child: Scaffold(
+        body: Container(
         decoration: BoxDecoration(
           gradient: LinearGradient(
             begin: Alignment.topCenter,
@@ -615,6 +626,7 @@ class _SignInPageState extends State<SignInPage> {
             ],
           ),
         ),
+        ),
       ),
     );
   }

frontend/lib/screens/create_post_screen.dart

@@ -70,7 +70,12 @@ class _CreatePostScreenState extends State<CreatePostScreen> {
     final remainingChars = _maxCharacters - _bodyController.text.length;
     final isOverLimit = remainingChars < 0;
 
-    return Scaffold(
+    return WillPopScope(
+      onWillPop: () async {
+        // Allow back navigation to go back to feed page only
+        return true;
+      },
+      child: Scaffold(
       appBar: AppBar(
         title: Text('Create Post', style: TextStyle(fontWeight: FontWeight.w600)),
         backgroundColor: Colors.white,
@@ -245,6 +250,7 @@ class _CreatePostScreenState extends State<CreatePostScreen> {
             ],
           ),
         ),
+        ),
       ),
     );
   }

frontend/lib/screens/home_screen.dart

@@ -15,11 +15,8 @@ class _HomeScreenState extends State<HomeScreen> {
 
   @override
   Widget build(BuildContext context) {
-    return WillPopScope(
+    return PopScope(
-      onWillPop: () async {
+      canPop: false, // Prevent going back to authentication screens
-        // Prevent going back to authentication screens
-        return false;
-      },
       child: Scaffold(
         body: _pages[_currentIndex],
         bottomNavigationBar: BottomNavigationBar(

frontend/lib/screens/notification_permission_screen.dart

@@ -79,7 +79,12 @@ class _NotificationPermissionScreenState
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
+    return WillPopScope(
+      onWillPop: () async {
+        // Prevent back navigation from notification permission screen
+        return false;
+      },
+      child: Scaffold(
       body: Container(
         decoration: BoxDecoration(
           gradient: LinearGradient(
@@ -236,6 +241,7 @@ class _NotificationPermissionScreenState
             ),
           ),
         ),
+        ),
       ),
     );
   }

frontend/lib/screens/pages/invitation_details_page.dart

@@ -152,7 +152,12 @@ class _InvitationDetailsPageState extends State<InvitationDetailsPage> {
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
+    return WillPopScope(
+      onWillPop: () async {
+        // Allow back navigation to go back to invitations page only
+        return true;
+      },
+      child: Scaffold(
       backgroundColor: Colors.grey[50],
       appBar: AppBar(
         title: Text(
@@ -545,6 +550,7 @@ class _InvitationDetailsPageState extends State<InvitationDetailsPage> {
                     ],
                   ),
                 ),
+        ),
     );
   }
 }

frontend/lib/screens/pages/invitations_page.dart

@@ -734,8 +734,13 @@ class _CreateInvitationPageState extends State<CreateInvitationPage> {
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
+    return WillPopScope(
-      body: Container(
+      onWillPop: () async {
+        // Allow back navigation to go back to invitations page only
+        return true;
+      },
+      child: Scaffold(
+        body: Container(
         decoration: BoxDecoration(
           gradient: LinearGradient(
             begin: Alignment.topCenter,
@@ -1095,6 +1100,7 @@ class _CreateInvitationPageState extends State<CreateInvitationPage> {
             ],
           ),
         ),
+        ),
       ),
     );
   }

frontend/lib/screens/pages/post_view_page.dart

@@ -149,10 +149,7 @@ class _PostViewPageState extends State<PostViewPage> {
                 final avatarLetter = _getAvatarLetter(user.displayName);
 
                 return Transform.translate(
-                  offset: Offset(
+                  offset: Offset(index < displayUsers.length - 1 ? -8 : 0, 0),
-                    index < displayUsers.length - 1 ? -8 : 0,
-                    0,
-                  ),
                   child: CircleAvatar(
                     radius: 16,
                     backgroundColor: Colors.white,
@@ -437,25 +434,28 @@ class _PostViewPageState extends State<PostViewPage> {
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
+    return PopScope(
-      appBar: AppBar(
+      canPop: true,
-        backgroundColor: Colors.white,
+      child: Scaffold(
-        elevation: 0,
+        appBar: AppBar(
-        leading: IconButton(
+          backgroundColor: Colors.white,
-          onPressed: () => Navigator.pop(context),
+          elevation: 0,
-          icon: Icon(Icons.arrow_back, color: Colors.black87),
+          leading: IconButton(
-        ),
+            onPressed: () => Navigator.pop(context),
-        title: Text(
+            icon: Icon(Icons.arrow_back, color: Colors.black87),
-          'Post',
+          ),
-          style: TextStyle(
+          title: Text(
-            color: Colors.black87,
+            'Post',
-            fontSize: 18,
+            style: TextStyle(
-            fontWeight: FontWeight.w600,
+              color: Colors.black87,
+              fontSize: 18,
+              fontWeight: FontWeight.w600,
+            ),
           ),
         ),
+        backgroundColor: Color(0xFFF5F5F5),
+        body: _buildBody(),
       ),
-      backgroundColor: Color(0xFFF5F5F5),
-      body: _buildBody(),
     );
   }
 

frontend/lib/screens/pages/profile_page.dart

@@ -674,9 +674,14 @@ class _SettingsPageState extends State<SettingsPage> {
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
+    return WillPopScope(
-      appBar: AppBar(
+      onWillPop: () async {
-        title: Text('Settings', style: TextStyle(fontWeight: FontWeight.w600)),
+        // Allow back navigation to go back to profile page only
+        return true;
+      },
+      child: Scaffold(
+        appBar: AppBar(
+          title: Text('Settings', style: TextStyle(fontWeight: FontWeight.w600)),
         backgroundColor: Colors.white,
         foregroundColor: Color(0xFF6A4C93),
         elevation: 0,
@@ -823,6 +828,7 @@ class _SettingsPageState extends State<SettingsPage> {
             ),
           ],
         ),
+        ),
       ),
     );
   }