Replace WireRewardTypeToUserGoodsType switch with a validating identity cast backed
by GiftRewardTypes.IsSupported. Wire type 1 is RedEther (UserGoodsType.RedEther),
not Crystal (UserGoodsType.Crystal=2); the old switch silently granted the wrong
wallet for every tutorial-completion claim. Update all 5 GiftControllerTests assertions
and 1 TutorialFlowEndToEndTests assertion to expect RedEther instead of Crystals.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>