Stage 6 Phase 0-1: Foundation — Switch component, new types, useAuth rewrite, useSettings cleanup
- Create switch.tsx: pure Tailwind Switch toggle, shadcn/ui pattern (forwardRef, cn(), role=switch, aria-checked)
- types/index.ts: extend Settings with all ntfy fields; add LoginSuccessResponse, LoginMfaRequiredResponse, LoginResponse discriminated union, TotpSetupResponse
- useAuth.ts: rewrite with username/password login, ephemeral mfaToken state, totpVerifyMutation, mfaRequired boolean, full mutation exports
- useSettings.ts: remove changePinMutation logic; keep deprecated changePin/isChangingPin stubs for compile compatibility until SettingsPage is rewritten in Phase 3
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Kyle Pope
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