The opt-in "keep unlocked" cache had no user-facing way to undo it mid-session
(it cleared only on logout / clear-site-data). Add a "Lock this device" button to
the profile modal footer (desktop + mobile), shown only when the active account
has a cached key to forget (app.isSessionKeptUnlocked -> client.hasCachedUnlockedKey).
Clicking it runs app.lockKeptUnlockedSession(pubkey), which re-locks in one action
everything the signer unlocks:
- forgets the cached key (both tiers) so future reloads re-prompt for the PIN,
- drops the in-memory signer (logoutSigner) so the CURRENT session re-locks now
(the next signing action prompts again via ensureEncryptionCapableSigner),
- storageService.lock(pubkey), and
- nwcSettingsService.clearCache() (re-hydrates from the signer next time).
Visibility refreshes on renderSavedProfiles + selectPane. Tests: 2 in
tests/profile-modal-controller.test.mjs (shown only when kept-unlocked; click locks
the active pubkey). Lint + build green.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
