feat(dashboard): close legacy parity gaps

tests/dashboard/conversations.test.tsx

@@ -178,6 +178,27 @@ describe('ConversationsPage', () => {
     expect(sendRequests).toBe(2);
   });
 
+  it('generates a media ask and looks up durable processed-user history', async () => {
+    installConversationList();
+    server.use(
+      http.post('/api/conversations/room-alice/suggest-media-ask', () => HttpResponse.json({ suggestedReply: 'Would you like to share a photo?' })),
+      http.get('/api/posts/by-author/alice', () => HttpResponse.json([{
+        id: 'post-1', subreddit: 'askuk', author: 'alice', title: 'A processed post',
+        imageUrl: null, imageAnalysis: null, generatedMessage: 'Hello',
+        processedAt: Date.now(), messageSent: true, error: null,
+      }])),
+    );
+    const user = userEvent.setup();
+    renderConversations();
+    await user.type(screen.getByLabelText('Lookup Reddit username'), 'u/alice');
+    await user.click(screen.getByRole('button', { name: 'Look up user' }));
+    expect(await screen.findByRole('list', { name: 'Processed posts for u/alice' })).toHaveTextContent('A processed post');
+
+    await user.click(screen.getByRole('button', { name: /u\/alice/ }));
+    await user.click(await screen.findByRole('button', { name: 'Suggest media ask' }));
+    expect(await screen.findByRole('textbox', { name: 'Reply to u/alice' })).toHaveValue('Would you like to share a photo?');
+  });
+
   it('starts a conversation and preserves both fields after a recoverable failure', async () => {
     installConversationList();
     let startRequests = 0;