feat: strengthen backup and mobile workflows

frontend/e2e/fixtures.ts

@@ -0,0 +1,29 @@
+import { expect, test as base } from '@playwright/test'
+
+export const expectedErrors = new WeakMap<object, Set<string>>()
+export function allowExpectedError(page: object, fragment: string) {
+  expectedErrors.get(page)?.add(fragment)
+}
+
+export const test = base.extend({
+  page: async ({ page }, use) => {
+    const failures: string[] = []
+    const allowed = new Set<string>()
+    expectedErrors.set(page, allowed)
+    const record = (message: string) => {
+      if (![...allowed].some(pattern => message.includes(pattern))) failures.push(message)
+    }
+    page.on('pageerror', error => record(`pageerror: ${error.message}`))
+    page.on('console', message => { if (message.type() === 'error') record(`console.error: ${message.text()}`) })
+    page.on('requestfailed', request => record(`requestfailed: ${request.method()} ${request.url()} ${request.failure()?.errorText ?? ''}`))
+    page.on('response', response => {
+      const url = new URL(response.url())
+      const baseURL = new URL(page.url() || 'http://127.0.0.1:5173')
+      if (url.origin === baseURL.origin && response.status() >= 400) record(`http ${response.status()}: ${response.request().method()} ${url.pathname}`)
+    })
+    await use(page)
+    expect(failures, 'unexpected browser/runtime errors').toEqual([])
+  },
+})
+
+export { expect }