test(e2e): a page load the machine had no buffer for is tried again

net::ERR_NO_BUFFER_SPACE stopped a release at its first page with nothing else running, and the
unchanged rerun passed. Every page load of the suite now goes through one helper, held by a test.

frontend/e2e/stylesheet.spec.ts

@@ -1,5 +1,6 @@
 import { test, expect, type Page } from "@playwright/test";
 import { openApp } from "./helpers";
+import { gotoRetrying } from "./retryConnect";
 
 // A request can be lost on the way on a loaded machine or a poor line. A lost stylesheet leaves the
 // whole page unstyled, and every test that finds its elements by testid still passes on it: only an
@@ -53,7 +54,7 @@ test("the app gets back a stylesheet lost on the way", async ({ page }) => {
 test("a public /watch link gets back a stylesheet lost on the way", async ({ page }) => {
   const lost = await loseEachStylesheetOnce(page);
   // No such link: the page says so, and it is the same entry with the same stylesheet.
-  await page.goto("/watch/no-such-token");
+  await gotoRetrying(page, "/watch/no-such-token");
   await expect(page.locator("#root")).not.toBeEmpty();
   expect(lost.length).toBeGreaterThan(0);
   await expectStyled(page);