Backend:
- New GET/PUT /api/me endpoint to read and update the authenticated
user's profile (currently display_name). UserStore.UpdateDisplayName.
- Wired into the authed router.
App:
- New SettingsScreen + SettingsViewModel with five sections:
* Account & Sync: login status, email, server URL, logout, connect.
* Profile: edit display name (pushed to PUT /api/me when logged in).
* Appearance: System / Light / Dark theme switch, persisted in
SessionManager and applied via MitbringslTheme(sessionManager).
* Data: 'Reset local data' wipes Room tables (server data kept).
* About: version, 'Developed by Janik Dietz', and credits to
GLM-5.2 + Gemini 3.6 Flash.
- Theme.kt now reads the user's theme preference (StateFlow) instead
of only the system default; MainActivity passes SessionManager in.
- Navigation: new SettingsNavKey; settings gear icon in ListsScreen
top bar; Settings links back to the Sync/Account screen.
- DTOs/API: UpdateMeRequestDto + getMe()/updateMe() for /api/me.
Argon2id password hashing (PHC format, self-encoded/decoded without an
external lib) with constant-time verification, UserStore (create/get by
email and id) and SessionStore (opaque crypto/rand tokens, SHA-256 hashed
in DB, create/lookup/revoke, last_seen_at bump on lookup).
HTTP layer: Register/Login/Logout handlers + RequireAuth middleware.
Login uses a dummy-hash path so unknown-email and wrong-password yield the
same timing/shape, narrowing user enumeration. Tokens accepted via Bearer
header (native clients) or session cookie (HttpOnly, SameSite=Lax).
Routes wired in api.go: POST /auth/register, /auth/login, /auth/logout.
Verified with go test, go vet and an end-to-end smoke test against a real
PostgreSQL container (register/login/logout/duplicate/short-pw/wrong-pw).
OIDC (Phase B part 2) follows next; the issueSession helper is reused.