v0.2.6

Fixed

• Scroll sync could stay half-broken on documents that exactly fill the
  viewport — the preview's scroll-fraction math divided by
  scrollHeight - clientHeight, which is 0 when there's no overflow to
  scroll yet. That produced NaN, which poisoned a duplicate-suppression
  check downstream and could stop scroll sync from engaging until you
  scrolled the preview manually once. Guarded with Math.max(1, ...) so it
  never divides by zero.

Added

• Automated UI test coverage for scroll sync — ScrollSyncUITests
  drives the real app end-to-end (types a long document, scrolls one pane,
  asserts the other pane's exposed scroll position updates) covering both
  sync directions, so this class of regression gets caught before release.
• The editor and preview panes now expose their live scroll position as an
  accessibility value/label, which both the new UI tests and assistive
  tech can read directly.

Full Changelog: v0.2.5...v0.2.6