update theme

lib/features/auth/presentation/pages/splash_page.dart

@@ -15,8 +15,10 @@ class SplashPage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+
     return Scaffold(
-      backgroundColor: AppColors.white,
+      backgroundColor: colorScheme.surface,
       body: Center(
         child: Column(
           mainAxisAlignment: MainAxisAlignment.center,
@@ -37,7 +39,7 @@ class SplashPage extends StatelessWidget {
                   Text(
                     'EUROTILE',
                     style: TextStyle(
-                      color: AppColors.white,
+                      color: Colors.white,
                       fontSize: 32.0,
                       fontWeight: FontWeight.w700,
                       letterSpacing: 1.5,
@@ -47,7 +49,7 @@ class SplashPage extends StatelessWidget {
                   Text(
                     'Worker App',
                     style: TextStyle(
-                      color: AppColors.white,
+                      color: Colors.white,
                       fontSize: 12.0,
                       letterSpacing: 0.5,
                     ),
@@ -59,19 +61,19 @@ class SplashPage extends StatelessWidget {
             const SizedBox(height: 48.0),
 
             // Loading Indicator
-            const CircularProgressIndicator(
-              valueColor: AlwaysStoppedAnimation<Color>(AppColors.primaryBlue),
+            CircularProgressIndicator(
+              valueColor: AlwaysStoppedAnimation<Color>(colorScheme.primary),
               strokeWidth: 3.0,
             ),
 
             const SizedBox(height: 16.0),
 
             // Loading Text
-            const Text(
+            Text(
               'Đang tải...',
               style: TextStyle(
                 fontSize: 14.0,
-                color: AppColors.grey500,
+                color: colorScheme.onSurfaceVariant,
               ),
             ),
           ],