Add support for repeat(N, track-list) and minmax(min, max) in
grid-template-columns/rows parsing. repeat() is expanded at parse time
into N copies of the track sizes, requiring no layout engine changes.
minmax() uses the max argument as a simplification that handles common
patterns like minmax(0, 1fr). auto-fill/auto-fit are gracefully skipped.
This fixes CNN grid layouts that use repeat(4, 1fr) and repeat(2, 1fr),
bringing the main headline and LIVE UPDATES badge into the viewport.
Updated CNN investigation: F-001 refined to flex overflow, F-012 added
as fixed.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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