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Grouped rows and columns now get Excel's outline band beside the headers: a bracket per group, a -/+ button on the summary line and level buttons in the corner. The buttons run data.hideDetail / data.showDetail and the new data.showLevels, so they undo. Hide Detail marks the summary line collapsed, Show Detail keeps inner groups that were collapsed on their own, and Group / Ungroup take by: rows|cols. Show Detail and Hide Detail are on the Data tab and in the Data menu, the group shortcuts are listed as Alt+Shift+Right / Left, and shortcut lookup reads navigation keys by their logical key so the numpad arrows work. Fixes #373 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>