add dispose to files to remove controllers when not used

Frontend/patient_manager/lib/components/inputsAndButtons/mihPassInput.dart

@@ -113,6 +113,12 @@ class _MIHPassFieldState extends State<MIHPassField> {
     });
   }
 
+  @override
+  void dispose() {
+    textFieldFocusNode.dispose();
+    super.dispose();
+  }
+
   @override
   void initState() {
     textFieldFocusNode.addListener(_onFocusChange);