Created createManaAuthStore in @manacore/shared-auth-stores that replaces
~350 lines of duplicated auth.svelte.ts per app with a ~10 line factory call.
The factory handles: SSO, passkeys, 2FA, magic links, token management,
password reset, sign up/in/out — everything the old stores did.
Each app only provides devBackendPort and optional onAuthenticated callback.
Before: 21 apps × ~350 lines = 6,800 lines of duplicated auth code
After: 21 apps × ~10 lines = 182 lines total (97% reduction)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
