update theme

lib/features/cart/presentation/widgets/checkout_dropdown_field.dart

@@ -28,16 +28,18 @@ class CheckoutDropdownField extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+
     return Column(
       crossAxisAlignment: CrossAxisAlignment.start,
       children: [
         RichText(
           text: TextSpan(
             text: label,
-            style: const TextStyle(
+            style: TextStyle(
               fontSize: 14,
               fontWeight: FontWeight.w500,
-              color: Color(0xFF1E293B),
+              color: colorScheme.onSurface,
             ),
             children: [
               if (required)
@@ -53,23 +55,23 @@ class CheckoutDropdownField extends StatelessWidget {
           initialValue: value,
           decoration: InputDecoration(
             filled: true,
-            fillColor: const Color(0xFFF8FAFC),
+            fillColor: colorScheme.surfaceContainerLowest,
             contentPadding: const EdgeInsets.symmetric(
               horizontal: 16,
               vertical: 12,
             ),
             border: OutlineInputBorder(
               borderRadius: BorderRadius.circular(AppRadius.input),
-              borderSide: const BorderSide(color: Color(0xFFE2E8F0)),
+              borderSide: BorderSide(color: colorScheme.outlineVariant),
             ),
             enabledBorder: OutlineInputBorder(
               borderRadius: BorderRadius.circular(AppRadius.input),
-              borderSide: const BorderSide(color: Color(0xFFE2E8F0)),
+              borderSide: BorderSide(color: colorScheme.outlineVariant),
             ),
             focusedBorder: OutlineInputBorder(
               borderRadius: BorderRadius.circular(AppRadius.input),
-              borderSide: const BorderSide(
-                color: AppColors.primaryBlue,
+              borderSide: BorderSide(
+                color: colorScheme.primary,
                 width: 2,
               ),
             ),