fix(ext/popup): stop Escape from leaking past the generator panel

Two related bugs from the gen-panel rewrite (ac15f06):

1. Escape key was bubbling to view-level keydown handlers in login.ts
   and settings-vault.ts, causing the press that closed the panel to
   also navigate the user away from the form/settings. Fix: call
   e.stopPropagation() in the panel's escHandler before closing.

2. settings-vault.teardown() didn't close any open generator panel,
   leaving the panel's escHandler registered and activePanel state
   stale across view transitions. Fix: call closeGeneratorPanel()
   first in teardown.

Plus a configure-defaults context test for the action-row composition
(no use/cancel buttons in that context).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

extension/src/popup/components/__tests__/generator-panel.test.ts

@@ -157,4 +157,13 @@ describe('generator-panel', () => {
     expect(isGeneratorPanelOpen()).toBe(false);
     expect(document.querySelector('.gen-panel')).toBeNull();
   });
+
+  it("configure-defaults context renders only the save-default action (no use/cancel)", async () => {
+    const { parent, trigger } = setupMount();
+    openGeneratorPanel({ parent, trigger, initial: DEFAULT_REQ, context: 'configure-defaults' });
+    await new Promise((r) => setTimeout(r, 50));
+    expect(document.querySelector('#gen-save-default')).not.toBeNull();
+    expect(document.querySelector('#gen-use')).toBeNull();
+    expect(document.querySelector('#gen-cancel')).toBeNull();
+  });
 });

extension/src/popup/components/generator-panel.ts

@@ -106,7 +106,10 @@ export function openGeneratorPanel(opts: OpenPanelOpts): void {
   opts.trigger.setAttribute('aria-expanded', 'true');
 
   const escHandler = (e: KeyboardEvent): void => {
-    if (e.key === 'Escape') closeGeneratorPanel();
+    if (e.key === 'Escape') {
+      e.stopPropagation();
+      closeGeneratorPanel();
+    }
   };
   document.addEventListener('keydown', escHandler);
 

extension/src/popup/components/settings-vault.ts

@@ -12,6 +12,7 @@ let pendingSettings: VaultSettings | null = null;
 let activeKeyHandler: ((e: KeyboardEvent) => void) | null = null;
 
 export function teardown(): void {
+  closeGeneratorPanel();
   if (activeKeyHandler) {
     document.removeEventListener('keydown', activeKeyHandler);
     activeKeyHandler = null;