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Install @fortune-sheet/react (MIT, v1.0.4) as Excel-like spreadsheet component. New SpreadsheetView.tsx converts unified grid data to Fortune Sheet format (celldata, merge config, column/row sizes). StepAnsicht now has Spreadsheet/Grid toggle: - Spreadsheet mode: full Fortune Sheet with toolbar (bold, italic, color, borders, merge cells, text wrap, undo/redo) - Grid mode: existing GridTable for quick editing Box-origin cells get light tinted background in spreadsheet view. Colspan cells converted to Fortune Sheet merge format. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>