refactor(v032): 탭 ARIA canonical + loadExpired dead-code 제거 (#14, #18)

- App.tsx 탭 button 의 aria-pressed → role="tab" + aria-selected
  (canonical pattern, a11y audit 정정)
- store.ts loadExpired action + test 제거 (App.tsx 호출 0건,
  loadInitial/refreshMeta 가 inline fetch — dead code)

tests/unit/App.test.tsx

@@ -130,25 +130,31 @@ describe('App header — 4 tabs', () => {
 
   it('renders 4 tabs with counts', async () => {
     render(<App />);
-    expect(await screen.findByRole('button', { name: /Inbox\(5\)/ })).toBeInTheDocument();
-    expect(screen.getByRole('button', { name: /완료\(3\)/ })).toBeInTheDocument();
-    expect(screen.getByRole('button', { name: /보관\(2\)/ })).toBeInTheDocument();
-    expect(screen.getByRole('button', { name: /휴지통\(1\)/ })).toBeInTheDocument();
+    expect(await screen.findByRole('tab', { name: /Inbox\(5\)/ })).toBeInTheDocument();
+    expect(screen.getByRole('tab', { name: /완료\(3\)/ })).toBeInTheDocument();
+    expect(screen.getByRole('tab', { name: /보관\(2\)/ })).toBeInTheDocument();
+    expect(screen.getByRole('tab', { name: /휴지통\(1\)/ })).toBeInTheDocument();
   });
 
   it('clicking 완료 tab sets view=completed', async () => {
     render(<App />);
-    fireEvent.click(await screen.findByRole('button', { name: /완료/ }));
+    fireEvent.click(await screen.findByRole('tab', { name: /완료/ }));
     expect(useInbox.getState().view).toBe('completed');
   });
 
-  it('aria-pressed reflects current view', async () => {
+  it('aria-selected reflects current view', async () => {
     useInbox.setState({ view: 'archived' });
     render(<App />);
-    const archivedBtn = await screen.findByRole('button', { name: /보관/ });
-    expect(archivedBtn.getAttribute('aria-pressed')).toBe('true');
-    const inboxBtn = screen.getByRole('button', { name: /Inbox/ });
-    expect(inboxBtn.getAttribute('aria-pressed')).toBe('false');
+    const archivedBtn = await screen.findByRole('tab', { name: /보관/ });
+    expect(archivedBtn.getAttribute('aria-selected')).toBe('true');
+    const inboxBtn = screen.getByRole('tab', { name: /Inbox/ });
+    expect(inboxBtn.getAttribute('aria-selected')).toBe('false');
+  });
+
+  it('inbox tab has aria-selected="true" when active', async () => {
+    render(<App />);
+    const inboxTab = await screen.findByRole('tab', { name: /Inbox/ });
+    expect(inboxTab).toHaveAttribute('aria-selected', 'true');
   });
 });
 
@@ -175,7 +181,7 @@ describe('App — onboarding wizard', () => {
   it('does not render OnboardingWizard when onboarding_completed=true', async () => {
     vi.mocked(inboxApi.getSettings).mockResolvedValue({ onboarding_completed: true });
     render(<App />);
-    await screen.findByRole('button', { name: /Inbox/ });
+    await screen.findByRole('tab', { name: /Inbox/ });
     expect(screen.queryByText(/Inkling 사용 시작/)).toBeNull();
   });
 });

tests/unit/store.expired.test.ts

@@ -52,15 +52,6 @@ describe('useInbox — expired state (v0.2.3 #5)', () => {
 
   afterEach(() => { vi.restoreAllMocks(); });
 
-  it('loadExpired sets expiredCandidates from inboxApi', async () => {
-    mockApi.listExpired.mockResolvedValueOnce([noteStub('n1')]);
-    const { useInbox } = await import('../../src/renderer/inbox/store.js');
-    await useInbox.getState().loadExpired();
-    const s = useInbox.getState();
-    expect(s.expiredCandidates).toHaveLength(1);
-    expect(s.expiredCandidates[0]!.id).toBe('n1');
-  });
-
   it('trashExpiredBatch removes ids and increments trashCount when confirmed', async () => {
     mockApi.trashExpiredBatch.mockResolvedValueOnce({ trashedCount: 2, confirmed: true });
     const { useInbox } = await import('../../src/renderer/inbox/store.js');