fixed bugs

lib/screens/meditation_page.dart

@@ -64,8 +64,6 @@ class _MeditationPageState extends State<MeditationPage>
   late final AnimationController _pulseCtrl;
   late final AnimationController _squareCtrl;
 
-  int bottomIndex = 3; // Meditazione
-
   @override
   void initState() {
     super.initState();
@@ -256,42 +254,6 @@ class _MeditationPageState extends State<MeditationPage>
     Navigator.pushReplacement(context, MaterialPageRoute(builder: (_) => page));
   }
 
-  void _handleBottomNav(int i) {
-    if (i == bottomIndex) return;
-    setState(() => bottomIndex = i);
-
-    if (i == 0) {
-      _goTo(
-        HomePage(
-          token: widget.token,
-          school: widget.school,
-          userFirstName: widget.userFirstName,
-        ),
-      );
-      return;
-    }
-
-    if (i == 1) {
-      _goTo(
-        LessonsPage(
-          token: widget.token,
-          school: widget.school,
-          userFirstName: widget.userFirstName,
-        ),
-      );
-      return;
-    }
-
-    if (i == 2) {
-      ScaffoldMessenger.of(
-        context,
-      ).showSnackBar(const SnackBar(content: Text('TODO: vai ad Account')));
-      return;
-    }
-
-    // i == 3 => già qui
-  }
-
   @override
   Widget build(BuildContext context) {
     final bubbleScale = Tween<double>(
@@ -340,31 +302,15 @@ class _MeditationPageState extends State<MeditationPage>
           ),
         ],
       ),
-      bottomNavigationBar: BottomNavigationBar(
-        type: BottomNavigationBarType.fixed,
-        backgroundColor: Colors.white,
-        selectedItemColor: kGreen,
-        unselectedItemColor: Colors.black54,
-        currentIndex: bottomIndex,
-        onTap: _handleBottomNav,
-        items: const [
-          BottomNavigationBarItem(
-            icon: Icon(Icons.home_rounded),
-            label: 'Home',
-          ),
-          BottomNavigationBarItem(
-            icon: Icon(Icons.event_note_rounded),
-            label: 'Lezioni',
-          ),
-          BottomNavigationBarItem(
-            icon: Icon(Icons.person_rounded),
-            label: 'Account',
-          ),
-          BottomNavigationBarItem(
-            icon: Icon(Icons.self_improvement_rounded),
-            label: 'Meditazione',
-          ),
-        ],
+      bottomNavigationBar: AppBottomNav(
+        currentIndex: 3,
+        token: widget.token,
+        school: widget.school,
+        userFirstName: widget.userFirstName,
+        onBeforeLeave: () async {
+          _pause();
+          await _stopMusic();
+        },
       ),
       body: YogibookBackground(
         child: SafeArea(