Change name of appbar file to mihAppbar and widget name to MIHAppBar

Frontend/patient_manager/lib/components/mihAppBar.dart

@@ -0,0 +1,23 @@
+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);
+
+  final String barTitle;
+
+  const MIHAppBar({super.key, required this.barTitle});
+
+  @override
+  Widget build(BuildContext context) {
+    return AppBar(
+      elevation: 8,
+      shadowColor: MzanziInnovationHub.of(context)!.theme.secondaryColor(),
+      title: Text(
+        barTitle,
+      ),
+      centerTitle: true,
+    );
+  }
+}