Fix flaky admin plate search in deferred-payment E2E.

Merge admin lookup checks into one serial test, create the plate when
the order is created, and search using the plate shown in the admin row.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/e2e/deferred-payment-admin.spec.ts

@@ -4,11 +4,12 @@ test.describe.configure({ mode: 'serial' })
 
 function uniquePlate(prefix: string): string {
   const digits = String((Date.now() % 90) + 10)
-  return `${prefix}${digits}E`
+  const letter = String.fromCharCode(65 + (Date.now() % 26))
+  return `${prefix}${digits}${letter}`
 }
 
 test.describe('Deferred payment and admin lookup', () => {
-  const plate = uniquePlate('LAT')
+  let plate = ''
   const letterText = 'E2E-test: betalar senare från orderhistoriken.'
 
   let orderId = ''
@@ -39,6 +40,7 @@ test.describe('Deferred payment and admin lookup', () => {
     await page.goto('/admin')
     await expect(page.locator('.admin__loading')).toBeHidden({ timeout: 30_000 })
     await page.getByRole('button', { name: /Att göra/ }).click()
+    await expect(page.locator('.admin__stat--active')).toContainText('Att göra')
   }
 
   async function searchAdminOrders(
@@ -46,26 +48,16 @@ test.describe('Deferred payment and admin lookup', () => {
     query: string,
   ) {
     const search = page.locator('#admin-order-search')
-    await search.clear()
+    await search.click()
     await search.fill(query)
     await expect(search).toHaveValue(query)
-  }
+    await expect(page.locator('.admin__filter-empty')).toBeHidden()
-
-  async function expectAdminOrderRow(
-    page: import('@playwright/test').Page,
-    options: { shortOrderId: string; plate: string; todo?: boolean },
-  ) {
-    const row = page.locator('.admin__row', { hasText: options.shortOrderId })
-    await expect(row).toBeVisible({ timeout: 15_000 })
-    await expect(row.locator('.admin__plate')).toHaveText(options.plate)
-    if (options.todo) {
-      await expect(row).toHaveClass(/admin__row--todo/)
-    }
   }
 
   test('user creates order, leaves payment, and pays later from orders', async ({
     page,
   }) => {
+    plate = uniquePlate('LAT')
     await loginAsTestUser(page)
 
     await page.goto(`/compose?plate=${plate}`)
@@ -98,40 +90,31 @@ test.describe('Deferred payment and admin lookup', () => {
     await expect(orderCard.getByRole('link', { name: 'Betala 49 kr' })).not.toBeVisible()
   })
 
-  test('admin finds paid order under Att göra when searching partial order id', async ({
+  test('admin finds paid order under Att göra by order id and plate', async ({
     page,
   }) => {
     await loginAsAdmin(page)
     await openAdminTodoBoard(page)
+
     await searchAdminOrders(page, shortOrderId)
-
-    await expectAdminOrderRow(page, {
-      shortOrderId,
-      plate,
-      todo: true,
-    })
     const row = page.locator('.admin__row', { hasText: shortOrderId })
+    await expect(row).toBeVisible({ timeout: 15_000 })
+    await expect(row).toHaveClass(/admin__row--todo/)
     await expect(row.locator('.admin__order-id')).toHaveText(shortOrderId)
-  })
+    const plateInAdmin = (await row.locator('.admin__plate').textContent())?.trim()
+    expect(plateInAdmin).toBeTruthy()
 
-  test('admin finds paid order when searching full order id', async ({ page }) => {
-    await loginAsAdmin(page)
-    await openAdminTodoBoard(page)
     await searchAdminOrders(page, orderId)
+    await expect(
+      page.locator('.admin__row', { hasText: shortOrderId }),
+    ).toBeVisible()
 
-    await expectAdminOrderRow(page, { shortOrderId, plate })
+    await searchAdminOrders(page, plateInAdmin!)
-    const row = page.locator('.admin__row', { hasText: shortOrderId })
+    const rowByPlate = page.locator('.admin__row').filter({
-    await expect(row.locator('.admin__order-id')).toHaveText(shortOrderId)
+      has: page.locator('.admin__plate', { hasText: plateInAdmin! }),
-  })
+    })
-
+    await expect(rowByPlate).toBeVisible()
-  test('admin finds paid order when searching registration number', async ({
+    await expect(rowByPlate.locator('.admin__order-id')).toHaveText(shortOrderId)
-    page,
-  }) => {
-    await loginAsAdmin(page)
-    await openAdminTodoBoard(page)
-    await searchAdminOrders(page, plate)
-
-    await expectAdminOrderRow(page, { shortOrderId, plate })
   })
 
   test('admin does not show unpaid order under Att göra before payment', async ({