Add Playwright e2e coverage and Node 20 pin

frontend/e2e/resume.spec.ts

@@ -0,0 +1,38 @@
+import { expect, test } from '@playwright/test'
+import {
+  createAuthenticatedApiContext,
+  createSession,
+  createTroubleshootingTree,
+  disposeApiContext,
+} from './helpers/api'
+
+test.describe('session resume smoke tests', () => {
+  test('can resume an incomplete session from the library page', async ({ page }) => {
+    const api = await createAuthenticatedApiContext()
+    const tree = await createTroubleshootingTree(api, {
+      question: 'Is the affected service still down?',
+    })
+    await createSession(api, tree.id, {
+      ticket_number: 'PW-RESUME',
+      client_name: 'Resume Client',
+    })
+
+    try {
+      await page.goto('/trees')
+
+      const resumeCard = page.locator('.bg-card').filter({ hasText: tree.name }).filter({ hasText: 'Resume' }).first()
+      await expect(resumeCard).toBeVisible()
+      await resumeCard.getByRole('button', { name: 'Resume' }).first().click()
+
+      await expect(page).toHaveURL(new RegExp(`/trees/${tree.id}/navigate`))
+      await expect(
+        page.getByRole('heading', { name: tree.name }),
+      ).toBeVisible()
+      await expect(
+        page.getByRole('heading', { name: 'Is the affected service still down?' }),
+      ).toBeVisible()
+    } finally {
+      await disposeApiContext(api)
+    }
+  })
+})