Playwright transpiles specs without typechecking (esbuild), so layout.spec.ts ran
green while `tsc -p tsconfig.e2e.json` failed: page.evaluate(() => document...)
callbacks need the DOM lib, and styleHandle.evaluate((el) => el.remove()) typed el as
Node (no .remove()). Phase 8 CI runs the typecheck gate, so this would have broken CI.
Adds DOM/DOM.Iterable to the e2e tsconfig (also covers 07-04 specs) and casts el to Element.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>