fix: use :scope instead of & in relative querySelector

[fastfrwrd]

Summary

getRowToScroll / getCellToScroll in src/utils/domUtils.ts build a relative selector to locate the focused row/cell inside the grid element, prefixed with the CSS-nesting & combinator:

gridEl.querySelector('& > [role="row"] > [tabindex="0"]')

Chromium accepts a leading & in a querySelector argument, but the standard token for "the element querySelector was called on" is :scope. Selector engines that follow the spec strictly — notably jsdom (nwsapi), widely used in unit tests — throw:

SyntaxError: '& > [role="row"] > [tabindex="0"]' is not a valid selector

This breaks header/cell focus (selectHeaderCell → setPosition → getCellToScroll) in any jsdom-based test that clicks a header, and anywhere the engine doesn't special-case &.

Change

Replace the leading & with :scope in both helpers. :scope > … is equivalent in the browser and valid across DOM implementations. No in-browser behavior change; the existing browser test suite is unaffected.

🤖 Generated with Claude Code

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.54%. Comparing base (ddff926) to head (2a384b0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4131   +/-   ##
=======================================
  Coverage   97.54%   97.54%           
=======================================
  Files          39       39           
  Lines        1588     1588           
  Branches      515      515           
=======================================
  Hits         1549     1549           
  Misses         39       39           

Files with missing lines	Coverage Δ
src/utils/domUtils.ts	100.00% <100.00%> (ø)

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