- game system selector: standalone, existing system (MTG/Pokemon/Lorcana/
SWU/FaB/One Piece/Sorcery/Grand Archive — codes match catalog imports),
or a user's custom game
- custom_games table + CRUD API (private per user, unique names)
- /games hub with create form; /games/[id] space with rename, delete,
card gallery, and ?game= deep-link into the designer
- catalog twin resolves game: system code, custom game name, or 'Custom'
- my-designs shows each design's game association
- migration 1787693311000
