Implemented Loading Overlay

lib/widgets/loading_notifier.dart

@@ -0,0 +1,42 @@
+import 'package:flutter/material.dart';
+
+class LoadingNotifier extends StatelessWidget {
+  const LoadingNotifier(
+      {super.key, required this.onDismissed, required this.message});
+  final void Function() onDismissed;
+  final String message;
+
+  @override
+  Widget build(BuildContext context) {
+    return Card(
+      color: Theme.of(context).colorScheme.primaryContainer,
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(45)),
+      child: SizedBox(
+        width: 500,
+        height: 60,
+        child: Padding(
+          padding: const EdgeInsets.symmetric(horizontal: 20),
+          child: Row(
+            mainAxisAlignment: MainAxisAlignment.spaceBetween,
+            mainAxisSize: MainAxisSize.max,
+            children: [
+              SizedBox(
+                width: 25,
+                height: 25,
+                child: CircularProgressIndicator(),
+              ),
+              Text(
+                message,
+                style: Theme.of(context).textTheme.titleSmall,
+              ),
+              IconButton(
+                onPressed: () => onDismissed(),
+                icon: Icon(Icons.close),
+              )
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}