test(e2e): fix admin-nav locator + add residential interest API coverage

- 21-role-based-ui: tighten the Settings link locator. The previous
  `getByRole('link', { name: /settings/i }).first().or(getByText(/.../) .first())`
  chain hit a strict-mode violation once the sidebar Admin section became
  default-expanded — both the section header text node and the Settings
  link matched. Match the link directly with exact: true.
- 26-residential: extend smoke with two API-driven specs covering the
  residential interest pipeline — create+list and detail-page render —
  using preferences-string stamp + heading match for assertions.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/e2e/smoke/26-residential.spec.ts

@@ -67,6 +67,84 @@ test.describe('Residential', () => {
     });
   });
 
+  test('create a residential interest via API and see it on the interests list', async ({
+    page,
+  }) => {
+    const portId = await getPortId(page);
+    const stamp = Date.now();
+
+    // 1) Create a residential client via the v1 API.
+    const clientRes = await page.request.post('/api/v1/residential/clients', {
+      data: {
+        fullName: `E2E Res ${stamp}`,
+        email: `e2e-res-${stamp}@test.example`,
+        phone: '+1-555-0199',
+      },
+      headers: { 'Content-Type': 'application/json', 'x-port-id': portId },
+    });
+    expect(clientRes.status()).toBe(201);
+    const clientBody = await clientRes.json();
+    const residentialClientId = clientBody.data?.id ?? clientBody.id;
+    expect(residentialClientId).toBeTruthy();
+
+    // 2) Create a residential interest tied to that client.
+    const interestRes = await page.request.post('/api/v1/residential/interests', {
+      data: {
+        residentialClientId,
+        preferences: `2BR oceanview, budget €${stamp}`,
+        notes: `Smoke interest ${stamp}`,
+        source: 'manual',
+      },
+      headers: { 'Content-Type': 'application/json', 'x-port-id': portId },
+    });
+    expect(interestRes.status()).toBe(201);
+    const interestBody = await interestRes.json();
+    const residentialInterestId = interestBody.data?.id ?? interestBody.id;
+    expect(residentialInterestId).toBeTruthy();
+
+    // 3) Confirm it shows up on the residential interests list page.
+    //    The list renders preferences/notes (not the client name), so match
+    //    against the unique stamp embedded in the preferences string.
+    await navigateTo(page, '/residential/interests');
+    await expect(page.getByText(new RegExp(String(stamp))).first()).toBeVisible({
+      timeout: 15_000,
+    });
+  });
+
+  test('residential interest detail page renders for a freshly-created interest', async ({
+    page,
+  }) => {
+    const portId = await getPortId(page);
+    const stamp = Date.now();
+
+    const clientRes = await page.request.post('/api/v1/residential/clients', {
+      data: {
+        fullName: `E2E ResDetail ${stamp}`,
+        email: `e2e-res-detail-${stamp}@test.example`,
+      },
+      headers: { 'Content-Type': 'application/json', 'x-port-id': portId },
+    });
+    expect(clientRes.status()).toBe(201);
+    const clientId = (await clientRes.json()).data?.id;
+
+    const interestRes = await page.request.post('/api/v1/residential/interests', {
+      data: { residentialClientId: clientId, preferences: 'penthouse, sea view', source: 'manual' },
+      headers: { 'Content-Type': 'application/json', 'x-port-id': portId },
+    });
+    expect(interestRes.status()).toBe(201);
+    const interestId = (await interestRes.json()).data?.id;
+
+    // Navigate to the detail route — the page should render the standard
+    // residential-interest detail layout (eyebrow + client name h1 + sections).
+    await navigateTo(page, `/residential/interests/${interestId}`);
+    await expect(page.getByText('Residential interest', { exact: true }).first()).toBeVisible({
+      timeout: 15_000,
+    });
+    await expect(page.getByRole('heading', { name: /E2E ResDetail/ }).first()).toBeVisible({
+      timeout: 5_000,
+    });
+  });
+
   test('public residential inquiry endpoint accepts a submission', async ({ page }) => {
     // Direct API call to the public endpoint — confirms wiring without UI.
     // Public endpoint takes portId via query string (no auth, but the helper