Files
amethyst/desktopApp
nrobi144 1c0141aba1 feat(privacylock): Desktop wiring — gate, password unlock, settings
Phase 5 (Desktop-only). Wraps the Messages deck column behind a
PBKDF2-hashed password gate; drops the Android-app slice.

- PrivacyLockSettings gains passwordHashed field + setter (salt$hash,
  base64). Backed by java.util.prefs on desktop.
- PasswordHasher: PBKDF2-HmacSHA256, 100k iterations, 16-byte salt,
  256-bit key, constant-time compare. Same primitive family as
  SecureKeyStorage.
- DesktopMessagesLockGate: synchronous branch select in composition
  (no LaunchedEffect guard) — closes the deep-link race per plan
  §Security Hardening H1. Renders content when Disabled/Unlocked;
  renders inline password TextField when Locked. Fires
  MessagesLockState.onLeaveRoute() in DisposableEffect onDispose so
  navigating away from the Messages column re-locks immediately.
- DesktopMessagesLockGate handles the "no password set" edge case
  with a Disable-lock affordance.
- LocalPrivacyLockSettings CompositionLocal + LocalMessagesLockState
  (from commons) both provided once at the App composition root in
  Main.kt. Constructed with the existing windowScope so the state
  holder's idle timer coroutines are lifecycle-scoped to the Window.
- DeckColumnContainer: DesktopMessagesScreen wrapped in
  DesktopMessagesLockGate for the Messages column.
- Desktop PrivacyLockSettingsScreen: Column + Card layout matching
  LocalRelaySettingsScreen (no Scaffold). Toggle, "Change password"
  affordance with a full set/change dialog (old + new + confirm),
  inactivity timer dropdown (1m / 5m / 15m / 1h / Never), redaction
  level dropdown (Hidden / Full), honest limitations copy. Auto-opens
  the set-password dialog if user toggles ON with no password set.
- Slotted into the existing Settings pane in Main.kt right after
  LocalRelaySettings.
2026-07-01 11:35:52 +03:00
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