add dispose to files to remove controllers when not used

Frontend/patient_manager/lib/components/mihAppBar.dart

@@ -1,21 +1,33 @@
 import 'package:flutter/material.dart';
 import 'package:patient_manager/main.dart';
 
-class MIHAppBar extends StatelessWidget implements PreferredSizeWidget {
-  @override
-  Size get preferredSize => const Size.fromHeight(60);
-
+class MIHAppBar extends StatefulWidget implements PreferredSizeWidget {
   final String barTitle;
 
   const MIHAppBar({super.key, required this.barTitle});
 
+  @override
+  State<MIHAppBar> createState() => _MIHAppBarState();
+
+  @override
+  // TODO: implement preferredSize
+  Size get preferredSize => const Size.fromHeight(60);
+}
+
+class _MIHAppBarState extends State<MIHAppBar> {
+  @override
+  void dispose() {
+    // TODO: implement dispose
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     return AppBar(
       elevation: 8,
       shadowColor: MzanziInnovationHub.of(context)!.theme.secondaryColor(),
       title: Text(
-        barTitle,
+        widget.barTitle,
       ),
       centerTitle: true,
     );