[ui] #36: auto-open the unlock-saved-key flow from storage when an nsec session is locked

Follow-up to the locked-nsec detection: clicking "Unlock Storage" on a locked
persisted-nsec session (no in-memory signer after a page reload) now auto-opens the
login modal straight to its existing unlock-saved-key (passphrase) flow, so the user
re-unlocks in one step instead of hunting for the Login menu. Once unlocked, the
signer is active app-wide and re-opening the storage pane auto-unlocks.

- applicationBootstrap: add a side-effect-free openLoginModal service to
  profileModalServices (app.loginModalController.openModal — no add-account callback;
  idempotently ensures the modal is initialized first).
- ProfileStorageController: reportLockedNsecSession({ autoOpenLogin }) opens the modal
  only from the user-initiated unlock click, never from the passive pane render (no
  surprise popups).
- Tests extended to 8 (auto-open fires on click; stays closed on passive render).

Build + lint clean.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

js/ui/applicationBootstrap.js

@@ -543,6 +543,33 @@ export default class ApplicationBootstrap {
           authService: app.authService,
           requestAddProfileLogin: (options) =>
             app.requestProfileAdditionLogin(options),
+          // Side-effect-free open of the login modal (no add-account callback). Used by
+          // the storage pane to route a locked persisted-nsec session to the existing
+          // unlock-saved-key (passphrase) flow. Returns true if the modal opened.
+          openLoginModal: (options = {}) => {
+            try {
+              if (typeof app.initializeLoginModalController === "function") {
+                app.initializeLoginModalController();
+              }
+            } catch (error) {
+              devLogger.warn(
+                "[Application] Failed to ensure login modal before open:",
+                error,
+              );
+            }
+            const controller = app.loginModalController;
+            if (controller && typeof controller.openModal === "function") {
+              try {
+                return controller.openModal(options) !== false;
+              } catch (error) {
+                devLogger.warn(
+                  "[Application] Failed to open login modal:",
+                  error,
+                );
+              }
+            }
+            return false;
+          },
           describeLoginError: (error, fallbackMessage) =>
             app.describeLoginError(error, fallbackMessage),
           hashtagPreferences: app.hashtagPreferences,