Interaction Reference

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Mouse

Action	Result
Click a cell	Selects that cell (blue border)
Shift+click a cell	Extends the selection into a range from the last-selected cell
Drag a cell	Multi-cell range selection (blue border + translucent overlay)
Double-click	Enters cell edit mode (only for columns included in editableCols)
Drag the scrollbar	Vertical/horizontal scroll
Click the scrollbar track	Jumps to that position immediately
Right-click a column header	Opens the column context menu (freeze, hide, insert, delete)
Right-click a row number	Opens the row context menu (insert, delete)

Keyboard

Key	Action
Ctrl+C	Copy selected cell(s)/range: range is copied in TSV format
Ctrl+V	Paste starting from the selection (only applied to editable columns)
Ctrl+Z	Undo
Ctrl+Y / Ctrl+Shift+Z	Redo
Ctrl+A	Extend the selection to the sheet’s used range (Excel-style “current region”)
↑ ↓ ← →	Move the cell selection
Shift+↑ ↓ ← →	Extend the cell selection
Enter	Commit the edit and move down one row
Tab	Commit the edit and move to the cell on the right (Shift+Tab: left)
Delete / Backspace	Clear the selected cell(s)
Escape	Cancel the edit

Performance note: Ctrl+A on a very large dataset (hundreds of thousands of rows or more) selects the entire used range, and Delete on that selection clears every cell in it synchronously. On a 1,000,000-row × 14-column grid this has been measured to block the main thread for tens of seconds; there’s no debounce or chunking on the clear path yet.