Remove all references to 'Guest' user type from the codebase, simplifying the role system to only support 'Admin' and 'User' roles.
Changes:
- Update type definitions to exclude 'Guest' from UserType
- Remove isGuest() method from SessionManager
- Remove Guest-specific logic from update services
- Update all type assertions from 'Admin | User | Guest' to 'Admin | User'
- Remove Guest UI styling from UserSelectionDialog
- Replace Guest fallback with ValidationError in settings handler
Error handling:
- Zod schema now rejects 'Guest' as invalid user type
- TypeScript will fail compilation if 'Guest' is referenced
- Runtime errors occur if database contains Guest users
No database migration needed (confirmed: no Guest users exist)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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