feat(dashboard): close legacy parity gaps

tests/dashboard/app.test.tsx

@@ -45,6 +45,7 @@ function installSuccessfulApi(overrides: TestStatsOverrides = {}) {
         messagesRemaining: 6,
       }),
     ),
+    http.get('/api/messages', () => HttpResponse.json([])),
   );
 }
 
@@ -106,6 +107,10 @@ describe('dashboard foundation', () => {
           messagesRemaining: 6,
         }),
       ),
+      http.get('/api/messages', () => HttpResponse.json([{
+        id: 1, postId: 'post-1', recipient: 'alice', subject: 'Hello', message: 'A recent opener',
+        sentAt: Date.now(), gotResponse: true, responseCheckedAt: Date.now(), strategyId: null, chatRoomId: null,
+      }])),
     );
 
     renderDashboard();
@@ -118,6 +123,8 @@ describe('dashboard foundation', () => {
     expect(screen.getByText('6 messages remaining')).toBeInTheDocument();
     expect(screen.getByText('No recent activity yet.')).toBeInTheDocument();
     expect(screen.getByText('Dry run')).toBeInTheDocument();
+    expect(await screen.findByRole('list', { name: 'Recent sent messages' })).toHaveTextContent('A recent opener');
+    expect(screen.getByRole('list', { name: 'Recent sent messages' })).toHaveTextContent('Responded');
   });
 
   it('keeps stats visible when timers fail and retries only the failed panel', async () => {