edd6431444d9d6a2ba4d05c052a6469f4c8b04ef
Add row_group_for/col_group_for to GridLayout, replacing inline backward-search logic. Refactor grid renderer to use col_group_for instead of pre-filtering col_items. Add gz keybinding for column group collapse toggle, symmetric with z for rows. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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