Add daily streak system and normalize bundle id to com.airkjw.blockseasons

Pure advanceStreak (1-day grace none, milestone flags at 3/7/14/30),
persisted in the save blob; StreakNotifier advances on every finished
attempt; home screen flame chip and milestone snackbar. Fix flutter
create's camelCased iOS bundle id and underscored Android application
id to the agreed lowercase form before any store registration.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

lib/l10n/app_en.arb

@@ -12,5 +12,13 @@
   "plusFiveMoves": "+5 moves (ad)",
   "giveUp": "Give up",
   "playAgain": "Play again",
-  "nextStage": "Next stage"
+  "nextStage": "Next stage",
+  "streakMilestone": "{days}-day streak! Keep it up!",
+  "@streakMilestone": {
+    "placeholders": {
+      "days": {
+        "type": "int"
+      }
+    }
+  }
 }

lib/l10n/app_ko.arb

@@ -12,5 +12,6 @@
   "plusFiveMoves": "+5 이동 (광고)",
   "giveUp": "포기하기",
   "playAgain": "다시 하기",
-  "nextStage": "다음 스테이지"
+  "nextStage": "다음 스테이지",
+  "streakMilestone": "{days}일 연속 플레이! 대단해요!"
 }