优化

lib/screens/profile_screen.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import '../l10n/app_localizations.dart';
 import '../theme/app_colors.dart';
+import '../theme/app_constants.dart';
 import '../services/storage_service.dart';
 import '../services/points_service.dart';
 import '../services/achievement_service.dart';
@@ -418,14 +419,14 @@ class _ProfileScreenState extends State<ProfileScreen> {
           const SizedBox(height: 16),
 
           // Calendar grid (last 28 days)
-          _buildCalendarGrid(),
+          _buildCalendarGrid(l10n),
         ],
       ),
     );
   }
 
   /// Build calendar grid showing check-in history
-  Widget _buildCalendarGrid() {
+  Widget _buildCalendarGrid(AppLocalizations l10n) {
     final now = DateTime.now();
     final today = DateTime(now.year, now.month, now.day);
 
@@ -434,16 +435,24 @@ class _ProfileScreenState extends State<ProfileScreen> {
         // Weekday labels
         Row(
           mainAxisAlignment: MainAxisAlignment.spaceAround,
-          children: ['S', 'M', 'T', 'W', 'T', 'F', 'S']
+          children: [
+            l10n.weekdayS,
+            l10n.weekdayM,
+            l10n.weekdayT,
+            l10n.weekdayW,
+            l10n.weekdayTh,
+            l10n.weekdayF,
+            l10n.weekdaySa,
+          ]
               .map(
                 (day) => SizedBox(
-                  width: 40,
+                  width: ProfileConstants.calendarCellSize,
                   child: Center(
                     child: Text(
                       day,
-                      style: const TextStyle(
+                      style: TextStyle(
                         fontFamily: 'Nunito',
-                        fontSize: 12,
+                        fontSize: FontSizes.caption,
                         fontWeight: FontWeight.w600,
                         color: AppColors.textSecondary,
                       ),