Add production web smoke coverage

tests/production-smoke.spec.ts

@@ -0,0 +1,36 @@
+import { test, expect } from '@playwright/test'
+
+const FULL_SESSION = 9472
+
+test.describe('Production serving (Go + built React)', () => {
+  test('serves race hub with classification from built assets', async ({ page }) => {
+    await page.goto(`/race-hub?session_key=${FULL_SESSION}`)
+
+    await expect(page.getByText('Final Classification')).toBeVisible()
+    await expect(page.locator('.drv-code', { hasText: 'VER' })).toBeVisible()
+  })
+
+  test('serves data library route', async ({ page }) => {
+    await page.goto('/data-library')
+
+    await expect(page.getByTestId('data-library')).toBeVisible()
+    await expect(page.getByTestId('dl-meeting-1229')).toBeVisible()
+  })
+
+  test('serves live route with empty state when live is disabled', async ({ page }) => {
+    await page.goto('/live')
+
+    await expect(page.getByTestId('live-empty')).toBeVisible()
+    await expect(page.getByText('No live session active')).toBeVisible()
+  })
+
+  test('nav links work from built SPA', async ({ page }) => {
+    await page.goto('/race-hub')
+    await page.getByRole('link', { name: 'Data Library' }).click()
+    await expect(page).toHaveURL(/\/data-library/)
+
+    await page.getByRole('link', { name: 'Live' }).click()
+    await expect(page).toHaveURL(/\/live/)
+    await expect(page.getByTestId('live-empty')).toBeVisible()
+  })
+})