No external auth providers to keep authentication fully self-sovereign
and avoid dependency on third-party services. Removes Google Sign-In,
Apple Sign-In components, utilities, endpoints, translations, and
mobile dependencies across all apps and shared packages.
Google/Apple integrations for data sync (Contacts import, Calendar sync)
are intentionally preserved as they serve a different purpose.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Add a unified welcome modal for guest mode that displays:
- App icon, name, and description from shared-branding
- Feature list of what guests can do (localized DE/EN)
- Warning about local-only data storage
- Login, Register, Help, and "Continue as Guest" buttons
New files:
- GuestWelcomeModal.svelte - The modal component
- guestWelcome.ts - localStorage utilities for tracking seen state
Integrated into: contacts, chat, todo, calendar, and clock apps
