Improved error messages

lib/widgets/error_screen.dart

@@ -0,0 +1,36 @@
+import 'package:flutter/material.dart';
+
+class ErrorScreen extends StatelessWidget {
+  final String error;
+
+  const ErrorScreen({
+    Key? key,
+    required this.error,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.all(16),
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          Icon(
+            Icons.error_rounded,
+            size: 50,
+            color: Theme.of(context).colorScheme.onSurfaceVariant,
+          ),
+          const SizedBox(height: 30),
+          Text(
+            error,
+            textAlign: TextAlign.center,
+            style: TextStyle(
+              fontSize: 24,
+              color: Theme.of(context).colorScheme.onSurfaceVariant,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}