feat: replace browser login with imported Reddit sessions

tests/dashboard/app.test.tsx

@@ -200,6 +200,15 @@ describe('dashboard foundation', () => {
     expect(timerRequests).toBe(2);
   });
 
+  it('styles the recent-messages retry control when its request fails', async () => {
+    installSuccessfulApi();
+    server.use(http.get('/api/messages', () => HttpResponse.json({ error: 'Messages unavailable' }, { status: 503 })));
+    renderDashboard();
+
+    const retryButton = await screen.findByRole('button', { name: 'Retry messages' });
+    expect(retryButton).toHaveClass('button', 'secondary');
+  });
+
   it('shows refresh progress while preserving the current overview', async () => {
     installSuccessfulApi();
     const user = userEvent.setup();