add success message to add patient, edit patient,patient notes, patient files.

update note and file view to match UI.
restrict file types in file uploud.
add image viewer

Frontend/patient_manager/lib/components/BuildFileView.dart

@@ -0,0 +1,44 @@
+import 'package:flutter/material.dart';
+import 'package:syncfusion_flutter_pdfviewer/pdfviewer.dart';
+
+class BuildFileView extends StatefulWidget {
+  final String pdfLink;
+  const BuildFileView({super.key, required this.pdfLink});
+
+  @override
+  State<BuildFileView> createState() => _BuildFileViewState();
+}
+
+class _BuildFileViewState extends State<BuildFileView> {
+  late PdfViewerController pdfViewerController = PdfViewerController();
+
+  String getExtType(String pdfLink) {
+    //print(pdfLink.split(".")[1]);
+    return pdfLink.split(".")[1];
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (getExtType(widget.pdfLink).toLowerCase() == "pdf") {
+      return SizedBox(
+        width: 700,
+        child: Column(
+          children: [
+            Expanded(
+              child: SfPdfViewer.network(
+                widget.pdfLink,
+                controller: pdfViewerController,
+              ),
+            ),
+          ],
+        ),
+      );
+    } else {
+      return InteractiveViewer(
+        maxScale: 5.0,
+        //minScale: 0.,
+        child: Image.network(widget.pdfLink),
+      );
+    }
+  }
+}