feat: rework account management page, add tooltip to settings

lib/features/settings/view/widgets/user_avatar.dart

@@ -0,0 +1,28 @@
+import 'package:flutter/material.dart';
+import 'package:paperless_mobile/features/login/model/user_account.dart';
+
+class UserAvatar extends StatelessWidget {
+  final String userId;
+  final UserAccount account;
+  const UserAvatar({
+    super.key,
+    required this.userId,
+    required this.account,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final backgroundColor = Colors.primaries[userId.hashCode % Colors.primaries.length];
+    final foregroundColor = backgroundColor.computeLuminance() > 0.5 ? Colors.black : Colors.white;
+    return CircleAvatar(
+      child: Text((account.fullName ?? account.username)
+          .split(" ")
+          .take(2)
+          .map((e) => e.substring(0, 1))
+          .map((e) => e.toUpperCase())
+          .join("")),
+      backgroundColor: backgroundColor,
+      foregroundColor: foregroundColor,
+    );
+  }
+}