chore: update eslint and stylelint configs and re-sync modern-normalize (#38982)

- update the vendored `modern-normalize` to v3.0.1
- require descriptions for lint disables in TS and CSS, same as we
already have in Go.
- disable core rules covered by `regexp/*` and `unicorn/*`, and ones
that cannot fire
- stop applying vitest rules to the playwright files in `tests/e2e`
- enable 7 stylelint rules, mostly `no-unknown` and `no-invalid` checks
- drop 2 unnecessary vendor prefixes (safari v17+, chrome v120+)
- look up ids via `querySelector` with `CSS.escape` instead of
`getElementById`
- remove stale doc about `@ts-expect-error`, it's forbidden
- misc dev doc fixes

Every declaration that `modern-normalize` v3 removes was checked against
chromium, webkit and firefox defaults first. The `hr` color and the
`:-moz-focusring` outline are kept as documented deviations, dropping
those does change rendering.

---------

Signed-off-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/js/swagger.ts

@@ -4,7 +4,7 @@ import {initSwaggerUI} from './render/swagger.ts';
 async function initGiteaAPIViewer() {
   const elSwaggerUi = document.querySelector<HTMLElement>('#swagger-ui')!;
   const url = elSwaggerUi.getAttribute('data-source')!;
-  const res = await fetch(url); // eslint-disable-line no-restricted-globals
+  const res = await fetch(url); // eslint-disable-line no-restricted-globals -- standalone entry, it must not pull in main site modules
   // HINT: SWAGGER-CSS-IMPORT: this is used in the standalone page which already has the related CSS imported by `<link>`
   await initSwaggerUI(elSwaggerUi, {specText: await res.text()});
 }