chore: update splash and launcher images across multiple resolutions

- Replaced splash screen images in various drawable folders (hdpi, mdpi, xhdpi, xxhdpi, xxxhdpi).
- Updated launcher background and icon images in mipmap folders for different resolutions.
- Modified app icon images in iOS asset catalog for various sizes and devices.
- Enhanced launch images for better visual consistency across platforms.

lib/core/router/app_router.dart

@@ -80,11 +80,13 @@ class RouterNotifier extends ChangeNotifier {
       return Routes.serverConnection;
     }
 
-    if (location == Routes.serverConnection) {
-      return Routes.chat;
-    }
-
     final authState = ref.read(authNavigationStateProvider);
+
+    if (location == Routes.serverConnection) {
+      return authState == AuthNavigationState.authenticated
+          ? Routes.chat
+          : Routes.authentication;
+    }
     final connectivityAsync = ref.read(connectivityStatusProvider);
     final connectivity = connectivityAsync.asData?.value;