test(vendors): keep the map preview out of the pixel baselines

The visual suite mocks `**/api/**` and nothing else, so the address map
preview's iframe reached maps.google.com for real. Whether that frame paints,
and what it paints, depends on the network and on what Google serves that
minute — which is why `vendor-edit` failed in CI at 18178 differing pixels
while passing in a container that could not reach Google. Regenerating the
baseline would not have fixed it; it would have moved the flake.

Aborting the request pins the frame to a blank box, so the shot measures our
layout and nothing else. The committed baselines are unchanged by this — they
were already correct — and a second container run with no --update passes
16/16, which is the evidence the shot is now stable rather than merely green
once.

e2e/vendors/vendors.visual.spec.ts

@@ -70,6 +70,13 @@ async function mockVendorApi(page: Page, mode: "default" | "empty" | "error" = "
   await page.clock.setFixedTime(new Date("2026-08-10T12:00:00.000Z"));
   await page.addInitScript((user) => localStorage.setItem("auth", JSON.stringify(user)), TEST_USER);
 
+  // The vendor address map preview embeds maps.google.com in an iframe. Its
+  // content depends on the network, on timing, and on whatever Google serves
+  // that minute, none of which belongs in a test with "deterministic pixel
+  // regression" in its name. Aborting the request pins the frame to a blank
+  // box, so the shot measures our layout and nothing else.
+  await page.route(/https:\/\/(www\.)?google\.com\/maps/, (route) => route.abort());
+
   await page.route("**/api/**", async (route) => {
     const request = route.request();
     const url = new URL(request.url());