## Summary
Clans aren't supported on CrazyGames, so don't let players set a clan
tag there.
- Tag the clan tag input wrapper with the existing `no-crazygames` class
so Main.ts's hiding logic removes it on CrazyGames, matching how other
CrazyGames-hidden elements work.
- Guard loading the stored clan tag (`loadStoredUsername`) so a tag
saved on the main site isn't silently submitted in the handshake while
on CrazyGames — CSS hiding alone wouldn't prevent that.
- Guard storing the tag (`validateAndStore`) so a returning user's saved
tag isn't clobbered with an empty value during a CrazyGames session.
## Testing
- `npx tsc --noEmit` — clean (no UsernameInput errors)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Evan
86599fe15b