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Add the app client for the Mobile SSO Authorization Bridge (PLAN.md §4.2): native "Sign in with <provider>" without shipping any OAuth secret. - Pkce: pure-JVM RFC 7636 S256 verifier/challenge + CSRF state, encoded to match the backend's base64url(SHA-256) exactly. - SsoAuthManager (Singleton): mints PKCE+state, builds the /auth/mobile/sso/start URL for a Custom Tab, verifies the returned state, exchanges the one-time code with the stashed verifier, and drives the existing SessionManager.onSignedIn — no new token-storage or refresh code. Pending flow is in-memory (fails closed on process death). Exposes an outcome StateFlow the login screen consumes. - SsoApi + DTOs: GET /auth/providers discovery and POST /auth/mobile/sso/exchange (tagged NO_SESSION so a credential 401 isn't read as an expired session). - MainActivity: runicgateway://auth/callback intent-filter + singleTop; parses the callback Uri (the Android edge) and hands raw params to SsoAuthManager. - LoginScreen/ViewModel: render a button per discovered provider, opening the bridge in a Custom Tab; fall back to the website login hand-off when none. Additive — no other screen's data flow changes; no backend work. Custom scheme only for now (App Links deferred, APP_LINKS.md). Tests (JVM, +14): Pkce vector/charset, start-URL building, and the full complete() flow over a fake SsoApi + real SessionManager (success signs in; state mismatch / missing pending fail without exchanging; error callback → declined; 401 → expired-code; replay finds no pending). Co-Authored-By: Claude <noreply@anthropic.com> Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NgyHnrNa8WwG3doxvxjuCr