Fix profile sync on alternate Vercel domains

[romahawk]

Summary

• prevents a fresh local onboarding placeholder from looking newer than an existing remote profile
• prefers an onboarded remote profile over a blank local New Player profile on first load from a new domain
• keeps existing user data in the shared Firebase project as the source of truth across Vercel URLs

Verification

• npm run typecheck
• npm run lint
• npm run build

Follow-up outside code

• add all active Vercel domains to Firebase Auth authorized domains
• promote or alias the fixed production deployment to magic-kick.vercel.app

[vercel]

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Project	Deployment	Actions	Updated (UTC)
magic-kick	Ready	Preview	Aug 4, 2026 11:28am
magic-kick-kfb8	Ready	Preview	Aug 4, 2026 11:28am