feat: improve terminal page ui

lib/widgets/empty_message.dart

@@ -0,0 +1,44 @@
+import 'package:flutter/material.dart';
+
+class EmptyMessage extends StatelessWidget {
+  const EmptyMessage({
+    super.key,
+    this.title = 'No logs yet',
+    this.subtitle = 'Send a request to view its details in the console.',
+    this.icon,
+  });
+
+  final String title;
+  final String subtitle;
+  final IconData? icon;
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    return Center(
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          if (icon != null) ...[
+            Icon(icon, size: 36, color: theme.colorScheme.outline),
+            const SizedBox(height: 8),
+          ],
+          Text(
+            title,
+            style: theme.textTheme.titleMedium?.copyWith(
+              fontWeight: FontWeight.w600,
+            ),
+          ),
+          const SizedBox(height: 6),
+          Text(
+            subtitle,
+            style: theme.textTheme.bodyMedium?.copyWith(
+              color: theme.colorScheme.outline,
+            ),
+            textAlign: TextAlign.center,
+          ),
+        ],
+      ),
+    );
+  }
+}