Mock /ping in driverAuth e2e so the ConnectivityIssue overlay does not hide the driver entry point (#266)

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## Why

`tests/e2e/driverAuth.spec.ts` (added in #265) failed across 4 full-E2E
matrix jobs on master:

- `E2E-full-Chromium-mobile-subuser-shard-1-of-1` (job 93176119977)
- `E2E-full-Chromium-desktop-subuser-shard-1-of-1` (job 93176119967)
- `E2E-full-Firefox-mobile-subuser-shard-1-of-1` (job 93176119955)
- `E2E-full-WebKit-mobile-subuser-shard-1-of-1` (job 93176119945)

Root cause: `/login` wraps the LoginForm in ConnectivityIssue, which
renders an overlay when GET /ping does not return ok. In the full
subuser E2E matrix driverAuth.spec.ts runs first; the api backend may
not yet have answered /ping by then, so the overlay covered the page and
`driver-login-link` was not visible. Targeted E2E (driverAuth only)
passed because the api was warm by then.

## Fix

Add a `test.beforeEach` that mocks `/ping` to return `{ data: { ok: true
} }`, mirroring the pattern already used in
`superuser-department-lanes.spec.ts`. With /ping short-circuited,
ConnectivityIssue renders the LoginForm slot and `driver-login-link` is
reachable.

## Risk

Low. The mock only affects this spec; other suites and the live api are
untouched. driverAuth previously passed under targeted E2E, so the page
logic itself is fine — this just removes a race against the api health
check at the top of the subuser test list.

---------

Co-authored-by: Truck Wash Agent <agent@copenhagentruckwash.local>

tests/e2e/driverAuth.spec.ts

@@ -11,6 +11,23 @@ import { expect, test } from "@playwright/test";
  *    on mobile (form inputs reachable, submit button visible).
  */
 
+// `/login` wraps the LoginForm in ConnectivityIssue, which shows an overlay
+// when GET /ping fails. In the full E2E matrix the api health check may not
+// have come up yet when this suite runs first, so mock /ping to short-circuit
+// the overlay and let the LoginForm (with the driver entry point) mount.
+const pingOkBody = JSON.stringify({ data: { ok: true } });
+
+test.beforeEach(async ({ page }) => {
+  await page.route(/\/ping(\?.*)?$/i, async (route) => {
+    await route.fulfill({
+      status: 200,
+      contentType: "application/json",
+      headers: { "access-control-allow-origin": "*" },
+      body: pingOkBody,
+    });
+  });
+});
+
 test.describe("[AUTH][Driver] discoverability", () => {
   test("/login surfaces the driver login button on desktop and mobile", async ({ page }, testInfo) => {
     await page.goto("/login");