add dispose to files to remove controllers when not used

Frontend/patient_manager/lib/components/builders/BuildFileView.dart

@@ -32,6 +32,12 @@ class _BuildFileViewState extends State<BuildFileView> {
     return path.split("/").last;
   }
 
+  @override
+  void dispose() {
+    pdfViewerController.dispose();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     // double width = MediaQuery.sizeOf(context).width;

Frontend/patient_manager/lib/components/builders/buildAccessRequestList.dart

@@ -253,6 +253,12 @@ class _BuildPatientsListState extends State<BuildAccessRequestList> {
     );
   }
 
+  @override
+  void dispose() {
+    // TODO: implement dispose
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     return ListView.separated(

Frontend/patient_manager/lib/components/builders/buildFilesList.dart

@@ -294,6 +294,12 @@ class _BuildFilesListState extends State<BuildFilesList> {
     );
   }
 
+  @override
+  void dispose() {
+    // TODO: implement dispose
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     if (widget.files.isNotEmpty) {

Frontend/patient_manager/lib/components/builders/buildMedList.dart

@@ -21,6 +21,12 @@ class BuildMedicinesList extends StatefulWidget {
 class _BuildMedicinesListState extends State<BuildMedicinesList> {
   int indexOn = 0;
 
+  @override
+  void dispose() {
+    // TODO: implement dispose
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     return ListView.separated(

Frontend/patient_manager/lib/components/builders/buildNotesList.dart

@@ -252,6 +252,15 @@ class _BuildNotesListState extends State<BuildNotesList> {
     );
   }
 
+  @override
+  void dispose() {
+    noteTextController.dispose();
+    businessNameController.dispose();
+    userNameController.dispose();
+    dateController.dispose();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     if (widget.notes.isNotEmpty) {

Frontend/patient_manager/lib/components/builders/buildPatientList.dart

@@ -337,6 +337,16 @@ class _BuildPatientsListState extends State<BuildPatientsList> {
     }
   }
 
+  @override
+  void dispose() {
+    dateController.dispose();
+    timeController.dispose();
+    idController.dispose();
+    fnameController.dispose();
+    lnameController.dispose();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     return ListView.separated(

Frontend/patient_manager/lib/components/builders/buildPatientQueueList.dart

@@ -147,6 +147,12 @@ class _BuildPatientsListState extends State<BuildPatientQueueList> {
     );
   }
 
+  @override
+  void dispose() {
+    // TODO: implement dispose
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     return ListView.separated(