fix: scroll active query suggestion into view on keyboard nav

[pedrosousa13]

Problem

In the JMESPath query panel, arrowing (↑/↓) through the autocomplete suggestions does not scroll the list. Once you move past the visible window (~9 items in the 220px dropdown), the highlighted item drops below the fold and you can't see where you are. Reproduces on any payload with many keys — e.g. a large Storyblok story.

Cause

renderSuggest() rebuilds the dropdown with replaceChildren() on every keystroke/arrow, which resets scrollTop to 0. The active item got the .jv-active highlight but the list never scrolled to follow it.

Mouse wheel and programmatic scroll always worked — this was specific to keyboard navigation.

Fix

After rebuilding the list, scroll the highlighted item into view:

querySuggestList
  .querySelector(".jv-active")
  ?.scrollIntoView({ block: "nearest" });

Tests

• New e2e regression (e2e/query-suggest-scroll.spec.ts): 60-key payload, arrow down 25×, assert the highlight stays within the scroll window. Red before the fix, green after.
• Stub Element.prototype.scrollIntoView in the jsdom unit env (jsdom doesn't implement it), matching the existing matchMedia stub.

Verification: typecheck clean · 214 unit tests pass · 31 e2e pass.