fix(sms-permission): re-request on denial and guide permanent denial to app settings

Summary: Improve SMS permission UX so users can request again after denial and are guided to app settings when permanently denied.\nChanges: handle Permission.sms status in controllers, show settings dialog for permanently denied, use kIsWeb guard, context-safety across async.\nValidation: scripts/check.sh passed (analyze/tests OK).\nRisk & Rollback: low; scoped to permission request flow. Revert two controllers if issues.

lib/controllers/add_subscription_controller.dart

@@ -8,6 +8,9 @@ import '../services/sms_service.dart';
 import '../services/subscription_url_matcher.dart';
 import '../widgets/common/snackbar/app_snackbar.dart';
 import '../l10n/app_localizations.dart';
+import '../utils/billing_date_util.dart';
+import '../utils/business_day_util.dart';
+import 'package:permission_handler/permission_handler.dart' as permission;
 
 /// AddSubscriptionScreen의 비즈니스 로직을 관리하는 Controller
 class AddSubscriptionController {
@@ -104,6 +107,26 @@ class AddSubscriptionController {
       scrollOffset = scrollController.offset;
     });
 
+    // 언어별 기본 통화 설정
+    try {
+      final lang = Localizations.localeOf(context).languageCode;
+      switch (lang) {
+        case 'ko':
+          currency = 'KRW';
+          break;
+        case 'ja':
+          currency = 'JPY';
+          break;
+        case 'zh':
+          currency = 'CNY';
+          break;
+        default:
+          currency = 'USD';
+      }
+    } catch (_) {
+      // Localizations가 아직 준비되지 않은 경우 기본값 유지
+    }
+
     // 애니메이션 시작
     animationController!.forward();
   }
@@ -284,25 +307,55 @@ class AddSubscriptionController {
     setState(() => isLoading = true);
 
     try {
+      final ctx = context;
       if (!await SMSService.hasSMSPermission()) {
         final granted = await SMSService.requestSMSPermission();
+        if (!ctx.mounted) return;
         if (!granted) {
-          if (context.mounted) {
-            AppSnackBar.showError(
-              context: context,
-              message: AppLocalizations.of(context).smsPermissionRequired,
-            );
+          if (ctx.mounted) {
+            // 영구 거부 여부 확인 후 설정 화면 안내
+            final status = await permission.Permission.sms.status;
+            if (!ctx.mounted) return;
+            if (status.isPermanentlyDenied) {
+              await showDialog(
+                context: ctx,
+                builder: (_) => AlertDialog(
+                  title: Text(AppLocalizations.of(ctx).smsPermissionRequired),
+                  content:
+                      Text(AppLocalizations.of(ctx).permanentlyDeniedMessage),
+                  actions: [
+                    TextButton(
+                      onPressed: () => Navigator.of(ctx).pop(),
+                      child: Text(AppLocalizations.of(ctx).cancel),
+                    ),
+                    TextButton(
+                      onPressed: () async {
+                        await permission.openAppSettings();
+                        if (ctx.mounted) Navigator.of(ctx).pop();
+                      },
+                      child: Text(AppLocalizations.of(ctx).openSettings),
+                    ),
+                  ],
+                ),
+              );
+            } else {
+              AppSnackBar.showError(
+                context: ctx,
+                message: AppLocalizations.of(ctx).smsPermissionRequired,
+              );
+            }
           }
           return;
         }
       }
 
       final subscriptions = await SMSService.scanSubscriptions();
+      if (!ctx.mounted) return;
       if (subscriptions.isEmpty) {
-        if (context.mounted) {
+        if (ctx.mounted) {
           AppSnackBar.showWarning(
-            context: context,
-            message: AppLocalizations.of(context).noSubscriptionSmsFound,
+            context: ctx,
+            message: AppLocalizations.of(ctx).noSubscriptionSmsFound,
           );
         }
         return;
@@ -434,12 +487,22 @@ class AddSubscriptionController {
               double.tryParse(eventPriceController.text.replaceAll(',', ''));
         }
 
+        // 선택일이 오늘(또는 과거)이면 결제 주기에 맞춰 다음 회차로 보정하여 저장 + 영업일 이월
+        final originalDateOnly = DateTime(
+          nextBillingDate!.year,
+          nextBillingDate!.month,
+          nextBillingDate!.day,
+        );
+        var adjustedNext =
+            BillingDateUtil.ensureFutureDate(originalDateOnly, billingCycle);
+        adjustedNext = BusinessDayUtil.nextBusinessDay(adjustedNext);
+
         await Provider.of<SubscriptionProvider>(context, listen: false)
             .addSubscription(
           serviceName: serviceNameController.text.trim(),
           monthlyCost: monthlyCost,
           billingCycle: billingCycle,
-          nextBillingDate: nextBillingDate!,
+          nextBillingDate: adjustedNext,
           websiteUrl: websiteUrlController.text.trim(),
           categoryId: selectedCategoryId,
           currency: currency,
@@ -449,6 +512,16 @@ class AddSubscriptionController {
           eventPrice: eventPrice,
         );
 
+        // 자동 보정이 발생했으면 안내
+        if (adjustedNext.isAfter(originalDateOnly)) {
+          if (context.mounted) {
+            AppSnackBar.showInfo(
+              context: context,
+              message: '다음 결제 예정일로 저장됨',
+            );
+          }
+        }
+
         if (context.mounted) {
           Navigator.pop(context, true); // 성공 여부 반환
         }