feat(core): add headerCursor override for column headers#1146

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dogfootruler-kr wants to merge 1 commit intoglideapps:mainfrom

dogfootruler-kr:feat/header-cursor-override

Commits on Oct 17, 2025

feat(core): add headerCursor override for column headers\n\n- Add headerCursor to BaseGridColumn\n- Thread through MappedGridColumn\n- Use override in header hover cursor logic\n- Document in API.md
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