test(editor): address PR #147 review — reflow tests, code-block guard, a11y

Resolve the pre-merge review items for the #146 NodeView content-first fix:

- Export collectScrollAncestors/reflowAfterPaste and add editor-paste-handler
  unit tests covering ancestor selection (overlay included, non-overflowing
  auto excluded, X axis), the scrollHeight>clientHeight gate, scrollingElement
  dedup, the docEl==null branch, and the double-rAF nudge.
- Extend the structural guard with CodeBlockView and merge the two it.each
  blocks into one document-order assertion (handles the <pre> nesting where the
  contentDOM is not the literal first child).
- Simplify the post-paste nudge to a single scrollTo(scrollLeft, scrollTop).
- Document that the post-paste reflow runs on every paste path intentionally,
  and cross-reference the two #146 mitigations in both fixes.
- a11y: aria-hidden the decorative footnotes heading and number marker, and
  label the footnotes list via role="group" + aria-label so the visual reorder
  does not break screen-reader reading order (WCAG 1.3.2).
- CHANGELOG: add a Fixed entry noting the caret fix is macOS-verified manually.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

CHANGELOG.md

@@ -19,6 +19,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   cut from 300 to 100 on upgrade. Set `SHARE_AI_WORKSPACE_MAX_PER_HOUR` to
   keep the previous limit. (#62)
 
+### Fixed
+
+- **Editor: caret/selection landed on the wrong line when clicking inside code
+  blocks and footnotes.** The affected NodeViews rendered their non-editable
+  chrome (language menu, footnotes heading, footnote number marker) before the
+  editable content, so the browser's click hit-testing missed the contentDOM and
+  snapped the caret to a previous node. Content now renders first in the DOM
+  (chrome is lifted back into place via CSS flex `order`), and scroll containers
+  are nudged after a paste to refresh stale hit-testing geometry. The caret
+  symptom is macOS-specific and was confirmed manually on macOS; the automated
+  guard pins the DOM-order invariant, not the caret behavior itself. (#146, #147)
+
 ## [0.93.0] - 2026-06-21
 
 This release builds on the 0.91.0 AI foundation: admin-defined AI agent roles,