✨ Error notifier

lib/shells/system_shell.dart

@@ -1,12 +1,43 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
+import 'package:get/get.dart';
 import 'package:rhythm_box/platform.dart';
+import 'package:rhythm_box/providers/error_notifier.dart';
 import 'package:window_manager/window_manager.dart';
 
-class SystemShell extends StatelessWidget {
+class SystemShell extends StatefulWidget {
   final Widget child;
 
   const SystemShell({super.key, required this.child});
 
+  @override
+  State<SystemShell> createState() => _SystemShellState();
+}
+
+class _SystemShellState extends State<SystemShell> {
+  late final ErrorNotifier _errorNotifier = Get.find();
+
+  StreamSubscription? _subscription;
+
+  @override
+  void initState() {
+    super.initState();
+    _subscription = _errorNotifier.showing.listen((value) {
+      if (value == null) {
+        ScaffoldMessenger.of(context).clearMaterialBanners();
+      } else {
+        ScaffoldMessenger.of(context).showMaterialBanner(value);
+      }
+    });
+  }
+
+  @override
+  void dispose() {
+    _subscription?.cancel();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     if (PlatformInfo.isMacOS) {
@@ -21,12 +52,12 @@ class SystemShell extends StatelessWidget {
               thickness: 0.3,
               height: 0.3,
             ),
-            Expanded(child: child),
+            Expanded(child: widget.child),
           ],
         ),
       );
     }
 
-    return child;
+    return widget.child;
   }
 }