feat: persist settings and enrich conversation context

tests/dashboard/app.test.tsx

@@ -171,6 +171,7 @@ describe('dashboard foundation', () => {
     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');
+    expect(screen.getByRole('link', { name: 'u/alice' })).toHaveAttribute('href', 'https://www.reddit.com/u/alice');
   });
 
   it('keeps stats visible when timers fail and retries only the failed panel', async () => {
@@ -200,6 +201,52 @@ describe('dashboard foundation', () => {
     expect(timerRequests).toBe(2);
   });
 
+  it('makes usernames in recent activity clickable', async () => {
+    installSuccessfulApi({
+      recentActivity: [{
+        timestamp: Date.now(),
+        type: 'response',
+        message: 'Reply from u/alice',
+        recipient: 'alice',
+      }],
+    });
+    renderDashboard();
+
+    const activity = await screen.findByRole('heading', { name: 'Recent activity' });
+    const panel = activity.closest('section');
+    expect(panel).not.toBeNull();
+    expect(within(panel!).getByRole('link', { name: 'u/alice' })).toHaveAttribute(
+      'href',
+      'https://www.reddit.com/u/alice',
+    );
+  });
+
+  it('opens saved source-post context from a sent activity entry', async () => {
+    installSuccessfulApi({
+      recentActivity: [{
+        timestamp: Date.now(),
+        type: 'sent',
+        message: 'Sent message to u/alice (r/example)',
+        recipient: 'alice',
+        imageUrl: 'https://i.redd.it/source.jpg',
+        postTitle: 'The source post title',
+        postUrl: 'https://www.reddit.com/r/example/comments/source/the_source_post_title/',
+      }],
+    });
+    const user = userEvent.setup();
+    renderDashboard();
+
+    await user.click(await screen.findByRole('button', { name: 'Sent message to u/alice (r/example)' }));
+
+    const dialog = screen.getByRole('dialog', { name: 'The source post title' });
+    expect(within(dialog).getByRole('img', { name: 'Source post: The source post title' })).toHaveAttribute(
+      'src', 'https://i.redd.it/source.jpg',
+    );
+    expect(within(dialog).getByRole('link', { name: 'Open Reddit post' })).toHaveAttribute(
+      'href', 'https://www.reddit.com/r/example/comments/source/the_source_post_title/',
+    );
+  });
+
   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 })));