feat: add a puzzle new page

frontend/lib/screens/home_screen.dart

@@ -14,7 +14,12 @@ class _HomeScreenState extends State<HomeScreen> {
   int _currentIndex = 0;
   int _availableInvitationsCount = 0;
 
-  final List<Widget> _pages = [FeedPage(), InvitationsPage(), WordlePage(), ProfilePage()];
+  final List<Widget> _pages = [
+    FeedPage(),
+    InvitationsPage(),
+    WordlePage(),
+    ProfilePage(),
+  ];
 
   @override
   void initState() {
@@ -57,12 +62,11 @@ class _HomeScreenState extends State<HomeScreen> {
               color: Colors.red,
               borderRadius: BorderRadius.circular(10),
             ),
-            constraints: BoxConstraints(
+            constraints: BoxConstraints(minWidth: 16, minHeight: 16),
-              minWidth: 16,
-              minHeight: 16,
-            ),
             child: Text(
-              _availableInvitationsCount > 99 ? '99+' : '$_availableInvitationsCount',
+              _availableInvitationsCount > 99
+                  ? '99+'
+                  : '$_availableInvitationsCount',
               style: TextStyle(
                 color: Colors.white,
                 fontSize: 10,
@@ -109,13 +113,22 @@ class _HomeScreenState extends State<HomeScreen> {
                 backgroundColor: Colors.transparent,
                 elevation: 0,
                 items: [
-                  BottomNavigationBarItem(icon: Icon(Icons.home), label: 'Feed'),
+                  BottomNavigationBarItem(
+                    icon: Icon(Icons.home),
+                    label: 'Feed',
+                  ),
                   BottomNavigationBarItem(
                     icon: _buildInvitationsBadge(),
                     label: 'Invitations',
                   ),
-                  BottomNavigationBarItem(icon: Icon(Icons.games), label: 'Puzzles'),
+                  BottomNavigationBarItem(
-                  BottomNavigationBarItem(icon: Icon(Icons.person), label: 'Profile'),
+                    icon: Icon(Icons.games),
+                    label: 'Puzzles',
+                  ),
+                  BottomNavigationBarItem(
+                    icon: Icon(Icons.person),
+                    label: 'Profile',
+                  ),
                 ],
               ),
             ),