chore: baseline styling screenshots (pre-fix)#607

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paddymul wants to merge 15 commits intomainfrom

screenshots/baseline

Commits on Feb 27, 2026

add screenshot apparatus for baseline styling comparison

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fix: checkout PR head SHA for screenshots, not merge ref

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fix: scroll grid body in pinned-index screenshots to expose #587

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fix: pierce shadow DOM for pinned-index scroll in screenshots

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fix: walk all shadow roots to find ag-body-viewport for scroll

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fix: use long headers in pinned stories so grid requires horizontal scroll

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fix: use 400px container for pinned stories to force horizontal scroll

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fix: add minWidth:120 via ag_grid_specs on pinned stories to force overflow

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fix: use keyboard End key to scroll pinned stories to rightmost column

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feat: add A9 story for #595 — many cols, long headers, year-like data

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fix: A9 story — 25 long cols in 400px to force data truncation (#595)

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fix: A9 — force maxWidth:50 on columns to reproduce #595 truncation

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fix: update A9 story to use width:40 + suppressAutoSize for #595 repro

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fix: update A9 story to use fitGridWidth + autoSizeStrategy override

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fix: update A9 story to 25 cols for visible truncation repro

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