Change color of dark theme for UI overlay

mobile/lib/modules/home/ui/immich_sliver_appbar.dart

@@ -100,7 +100,14 @@ class ImmichSliverAppBar extends ConsumerWidget {
             ],
           ),
         ],
-        systemOverlayStyle: SystemUiOverlayStyle.light,
+        systemOverlayStyle: const SystemUiOverlayStyle(
+          // Status bar color
+          statusBarColor: Colors.indigo,
+
+          // Status bar brightness (optional)
+          statusBarIconBrightness: Brightness.dark, // For Android (dark icons)
+          statusBarBrightness: Brightness.light, // For iOS (dark icons)
+        ),
       ),
     );
   }