fix: use Stack to render overlay above ListView content

lib/settings_screen.dart

@@ -167,7 +167,9 @@ class _SettingsScreenState extends State<SettingsScreen> {
           child: Container(height: 1, color: const Color(0xFF2a2a2a)),
         ),
       ),
-      body: ListView(
+      body: Stack(
+        children: [
+          ListView(
             padding: const EdgeInsets.all(20),
             children: [
               _buildSectionHeader('SERVER'),
@@ -204,6 +206,8 @@ class _SettingsScreenState extends State<SettingsScreen> {
               const SizedBox(height: 32),
               _buildSaveButton(),
               const SizedBox(height: 20),
+            ],
+          ),
           if (_showEasterEgg) _buildEasterEggOverlay(),
         ],
       ),