✨ feat: add console error monitoring for Playwright tests; enhance page fixture with error assertions

tests/e2e/fixtures.ts

@@ -1,5 +1,6 @@
 import { test as base, expect, type Page } from "@playwright/test"
 import { ensureTestUser, type TestUserCredentials } from "../api/helpers/test-user"
+import { attachConsoleMonitor } from "../fixtures/console-monitor"
 
 const API_BASE = "/api"
 
@@ -29,6 +30,8 @@ export const test = base.extend<E2eFixtures, E2eWorkerFixtures>({
      * navigation methods to "domcontentloaded".
      */
     page: async ({ page }, use) => {
+        const monitor = attachConsoleMonitor(page)
+
         const origGoto = page.goto.bind(page)
         const origReload = page.reload.bind(page)
         const origGoBack = page.goBack.bind(page)
@@ -42,6 +45,7 @@ export const test = base.extend<E2eFixtures, E2eWorkerFixtures>({
             origGoForward({ waitUntil: "domcontentloaded", ...opts })) as typeof page.goForward
 
         await use(page)
+        monitor.assertNoErrors()
     },
 
     // Worker-scoped: create/reuse test user once per worker