Bulk row operations: copy, cut, delete, and clear in large selections

Virtualized grids render a window of rows; selection logic should still track row identities (IDs) so bulk actions apply to the right originals. Clipboard payloads may hit OS size limits on enormous selections, chunk if needed.

Semantics

• Clear often zeroes cells but keeps row keys;delete removes lines entirely.
• Confirm whether your export includes only visible/filtered rows.