added guardian letters with chat and multiple answer functionalities

lib/widget/module_badge_icon.dart

@@ -0,0 +1,31 @@
+import 'package:badges/badges.dart' as badges;
+import 'package:flutter/material.dart';
+
+/// Module icon with an unread counter; the plain icon while [count] is zero.
+class ModuleBadgeIcon extends StatelessWidget {
+  final IconData icon;
+  final int count;
+
+  const ModuleBadgeIcon({required this.icon, required this.count, super.key});
+
+  @override
+  Widget build(BuildContext context) => badges.Badge(
+    showBadge: count > 0,
+    position: badges.BadgePosition.topEnd(top: -3, end: -3),
+    stackFit: StackFit.loose,
+    badgeStyle: badges.BadgeStyle(
+      padding: const EdgeInsets.all(3),
+      badgeColor: Theme.of(context).primaryColor,
+      elevation: 1,
+    ),
+    badgeContent: Text(
+      '$count',
+      style: const TextStyle(
+        color: Colors.white,
+        fontSize: 10,
+        fontWeight: FontWeight.bold,
+      ),
+    ),
+    child: Icon(icon),
+  );
+}