Implements M3 (docs/android/PLAN.md §4): the functional Kotlin auth pass.
- Native username/password (+ single-request TOTP) login over the existing
POST /auth/mobile/login; a 401 { totpRequired } reveals the code field, 429
surfaces a backoff message (§4.1).
- Token pair in EncryptedSharedPreferences (TokenStore behind SessionManager,
the single source of truth for the in-memory bearer + observable Session);
base URL stays in plain DataStore (§4.3).
- OkHttp AuthInterceptor (bearer) + TokenAuthenticator: one-shot, mutex-
serialized refresh-on-401 that replays the request, on its own bare client so
it can never recurse; single-use rotation; dead refresh signs out, transient
network keeps the session.
- Logout (POST /auth/mobile/logout, this session or all devices) tears down
locally even on failure.
- GET /auth/me re-validates the role on every resume; a surviving 401 signs out
(role stays advisory — backend is authority).
- Declarative access-level menu (visibleEntries: public/signed-in/player) with a
Sign in / Sign out toggle + a My Account screen.
- Custom-Tab hand-offs (androidx.browser) to the website for register / forgot-
password / SSO — no native screens (§4.2).
- Settings → Server switch now also clears the stored session (§3).
Biometric app-lock is deferred to M6 (tokens already encrypted at rest; it is
opt-in UX, not a v1 requirement — decided at M3).
JVM unit tests (18): auth-DTO decode (incl. totpRequired vs a plain credential
401), the SessionManager lifecycle over a fake store, and the menu access filter
+ role mapping. No backend/API change — a pure consumer of the existing mobile
bearer + /auth/me surface.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NgyHnrNa8WwG3doxvxjuCr
