chore: fix oxlint errors (#13434)

#### PR Dependency Tree


* **PR #13434** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Style**
* Improved clarity of TypeScript error suppression comments across
various test files and helper scripts. Comments now specify the reasons
for ignoring specific type errors, enhancing code readability for
developers.
* **Chores**
* Updated inline comments without affecting application functionality or
user experience. No changes to features, logic, or test outcomes.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

tests/kit/src/playwright.ts

@@ -77,7 +77,7 @@ export const test = baseTest.extend<{
     if (enableCoverage) {
       await context.addInitScript(() =>
         window.addEventListener('beforeunload', () =>
-          // @ts-expect-error
+          // @ts-expect-error window.__coverage__ is not typed
           window.collectIstanbulCoverage(JSON.stringify(window.__coverage__))
         )
       );
@@ -103,7 +103,7 @@ export const test = baseTest.extend<{
     if (enableCoverage) {
       for (const page of context.pages()) {
         await page.evaluate(() =>
-          // @ts-expect-error
+          // @ts-expect-error window.__coverage__ is not typed
           window.collectIstanbulCoverage(JSON.stringify(window.__coverage__))
         );
       }