fix: Add missing badge check after AI sake registration

## Bug Fix
- Badge "初めての一歩" was not unlocking when adding first sake item
- Root cause: GamificationService.checkAndUnlockBadges() was never called in camera_screen.dart

## Changes
- Import gamification_service.dart
- Call checkAndUnlockBadges(ref) after adding sake item to Hive
- Display newly unlocked badges in success SnackBar
- Extend SnackBar duration when badges are unlocked (4s -> 6s)

## User Impact
- Users will now see badge unlock notifications: "バッジ獲得: 初めての一歩 🍶"
- All badge unlock conditions (first_step, regional, collector, flavor) now work correctly

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

lib/screens/camera_screen.dart

@@ -11,6 +11,7 @@ import 'package:gal/gal.dart';
 
 import '../services/gemini_service.dart';
 import '../services/image_compression_service.dart'; // Phase 4 Added
+import '../services/gamification_service.dart'; // Badge check
 import '../widgets/analyzing_dialog.dart';
 import '../models/sake_item.dart';
 import '../theme/app_theme.dart';
@@ -389,6 +390,9 @@ class _CameraScreenState extends ConsumerState<CameraScreen> with SingleTickerPr
 
       await ref.read(userProfileProvider.notifier).updateTotalExp(userProfileState.totalExp + 10);
 
+      // Check and unlock badges
+      final newBadges = await GamificationService.checkAndUnlockBadges(ref);
+
       // Refetch updated state for level comparison
       final updatedProfile = ref.read(userProfileProvider);
       final newLevel = updatedProfile.level;
@@ -408,13 +412,8 @@ class _CameraScreenState extends ConsumerState<CameraScreen> with SingleTickerPr
       // Close Camera Screen (Return to Home)
       Navigator.of(context).pop();
 
-      // Success Message (with EXP/Level Up info)
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(
-          content: Column(
-            mainAxisSize: MainAxisSize.min,
-            crossAxisAlignment: CrossAxisAlignment.start,
-            children: [
+      // Success Message (with EXP/Level Up/Badge info)
+      final List<Widget> messageWidgets = [
         Text('${sakeItem.displayData.name} を登録しました！'),
         const SizedBox(height: 4),
         Row(
@@ -427,9 +426,35 @@ class _CameraScreenState extends ConsumerState<CameraScreen> with SingleTickerPr
             ),
           ],
         ),
+      ];
+
+      // Add badge notifications
+      if (newBadges.isNotEmpty) {
+        messageWidgets.add(const SizedBox(height: 8));
+        for (var badge in newBadges) {
+          messageWidgets.add(
+            Row(
+              children: [
+                Text(badge.icon, style: const TextStyle(fontSize: 16)),
+                const SizedBox(width: 8),
+                Text(
+                  'バッジ獲得: ${badge.name}',
+                  style: const TextStyle(fontWeight: FontWeight.bold, color: Colors.greenAccent),
+                ),
               ],
             ),
-          duration: const Duration(seconds: 4), // Longer display for level up
+          );
+        }
+      }
+
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Column(
+            mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: messageWidgets,
+          ),
+          duration: Duration(seconds: newBadges.isNotEmpty ? 6 : 4), // Longer for badges
         ),
       );
 
@@ -793,9 +818,7 @@ class _ExposureSliderPainter extends CustomPainter {
       // Draw knob
       canvas.drawCircle(Offset(trackX, knobY), 6, knobPaint);
     }
-  }
-
-  @override
+  }  @override
   bool shouldRepaint(_ExposureSliderPainter oldDelegate) {
     return oldDelegate.currentValue != currentValue ||
         oldDelegate.minValue != minValue ||