feat: adopt material 3 theme and billing adjustments

lib/widgets/common/snackbar/app_snackbar.dart

@@ -1,5 +1,5 @@
 import 'package:flutter/material.dart';
-import '../../../theme/app_colors.dart';
+import '../../../theme/color_scheme_ext.dart';
 
 /// 앱 전체에서 사용되는 통합 스낵바
 /// 성공, 에러, 정보 등 다양한 타입의 메시지를 표시합니다.
@@ -16,9 +16,9 @@ class AppSnackBar {
       context: context,
       message: message,
       icon: icon,
-      backgroundColor: AppColors.successColor,
-      iconColor: AppColors.pureWhite,
-      textColor: AppColors.pureWhite,
+      backgroundColor: Theme.of(context).colorScheme.success,
+      iconColor: Theme.of(context).colorScheme.onPrimary,
+      textColor: Theme.of(context).colorScheme.onPrimary,
       duration: duration,
       showAtTop: showAtTop,
     );
@@ -32,13 +32,14 @@ class AppSnackBar {
     Duration duration = const Duration(seconds: 4),
     bool showAtTop = true,
   }) {
+    final cs = Theme.of(context).colorScheme;
     _show(
       context: context,
       message: message,
       icon: icon,
-      backgroundColor: AppColors.dangerColor,
-      iconColor: AppColors.pureWhite,
-      textColor: AppColors.pureWhite,
+      backgroundColor: cs.error,
+      iconColor: Theme.of(context).colorScheme.onPrimary,
+      textColor: Theme.of(context).colorScheme.onPrimary,
       duration: duration,
       showAtTop: showAtTop,
     );
@@ -56,9 +57,9 @@ class AppSnackBar {
       context: context,
       message: message,
       icon: icon,
-      backgroundColor: AppColors.primaryColor,
-      iconColor: AppColors.pureWhite,
-      textColor: AppColors.pureWhite,
+      backgroundColor: Theme.of(context).colorScheme.primary,
+      iconColor: Theme.of(context).colorScheme.onPrimary,
+      textColor: Theme.of(context).colorScheme.onPrimary,
       duration: duration,
       showAtTop: showAtTop,
     );
@@ -76,9 +77,9 @@ class AppSnackBar {
       context: context,
       message: message,
       icon: icon,
-      backgroundColor: AppColors.warningColor,
-      iconColor: AppColors.pureWhite,
-      textColor: AppColors.pureWhite,
+      backgroundColor: Theme.of(context).colorScheme.warning,
+      iconColor: Theme.of(context).colorScheme.onPrimary,
+      textColor: Theme.of(context).colorScheme.onPrimary,
       duration: duration,
       showAtTop: showAtTop,
     );
@@ -90,8 +91,8 @@ class AppSnackBar {
     required String message,
     required IconData icon,
     required Color backgroundColor,
-    Color iconColor = AppColors.pureWhite,
-    Color textColor = AppColors.pureWhite,
+    Color iconColor = Colors.white,
+    Color textColor = Colors.white,
     Duration duration = const Duration(seconds: 3),
     bool showAtTop = true,
     SnackBarAction? action,
@@ -200,25 +201,25 @@ class AppSnackBar {
               width: 24,
               height: 24,
               margin: const EdgeInsets.only(right: 12),
-              child: const CircularProgressIndicator(
+              child: CircularProgressIndicator(
                 strokeWidth: 2.5,
-                color: AppColors.pureWhite,
+                color: Theme.of(context).colorScheme.onPrimary,
               ),
             ),
             // 메시지
             Expanded(
               child: Text(
                 message,
-                style: const TextStyle(
+                style: TextStyle(
                   fontSize: 16,
                   fontWeight: FontWeight.w500,
-                  color: AppColors.pureWhite,
+                  color: Theme.of(context).colorScheme.onPrimary,
                 ),
               ),
             ),
           ],
         ),
-        backgroundColor: AppColors.primaryColor,
+        backgroundColor: Theme.of(context).colorScheme.primary,
         behavior: SnackBarBehavior.floating,
         margin: showAtTop
             ? EdgeInsets.only(
@@ -249,7 +250,7 @@ class AppSnackBar {
     required String actionLabel,
     required VoidCallback onActionPressed,
     IconData icon = Icons.info_rounded,
-    Color backgroundColor = AppColors.primaryColor,
+    Color? backgroundColor,
     Duration duration = const Duration(seconds: 4),
     bool showAtTop = true,
   }) {
@@ -257,14 +258,14 @@ class AppSnackBar {
       context: context,
       message: message,
       icon: icon,
-      backgroundColor: backgroundColor,
-      iconColor: AppColors.pureWhite,
-      textColor: AppColors.pureWhite,
+      backgroundColor: backgroundColor ?? Theme.of(context).colorScheme.primary,
+      iconColor: Theme.of(context).colorScheme.onPrimary,
+      textColor: Theme.of(context).colorScheme.onPrimary,
       duration: duration,
       showAtTop: showAtTop,
       action: SnackBarAction(
         label: actionLabel,
-        textColor: AppColors.pureWhite,
+        textColor: Theme.of(context).colorScheme.onPrimary,
         onPressed: onActionPressed,
       ),
     );