test: address Qodo review — clear cookies on the page's own context (#7900)

browser.newContext()+clearCookies() cleared cookies on a throwaway context
(not the page fixture under test) and leaked the context. Use
page.context().clearCookies() so the regression test reliably starts without a
stale rtlIsTrue pref.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: JohnMcLear

src/tests/frontend-new/specs/rtl_pad_wide_enforce.spec.ts

@@ -15,9 +15,10 @@ import {showSettings} from "../helper/settingsHelper";
 // Fix: changePadViewOption syncs the creator's personal pref to the value they
 // chose, so their own view adopts the pad-wide setting immediately (while still
 // allowing them to override it afterwards via the "My view" controls).
-test.beforeEach(async ({page, browser}) => {
-  const context = await browser.newContext();
-  await context.clearCookies();
+test.beforeEach(async ({page}) => {
+  // Clear cookies on the context of the page under test (not a throwaway
+  // context) so the test reliably starts without a stale rtlIsTrue pref.
+  await page.context().clearCookies();
   await goToNewPad(page);
 });