[Feat]: Paste cells from clipboard into the data grid

[ymadd]

Is your feature request related to a problem?

Cells, rows, and ranges can be copied from the data grid (Cmd/Ctrl+C, context menu), but there is no way to paste data back into the grid. Filling several cells means editing them one by one.

Describe the solution you'd like

Spreadsheet-style paste (DBeaver/Excel-like), staged through the existing pending-changes flow (commit/rollback):

• Cmd/Ctrl+V pastes at the current selection — cell range top-left, top of the row selection, or the focused cell — plus a context-menu "Paste" entry.
• TSV from spreadsheet apps and the grid's own CSV copy formats (comma/semicolon/pipe, optional header row) should round-trip.
• A single copied value fills the selected range.
• Data is clipped at the grid edges; nothing is written directly to the database — pasted values are staged and go through the normal apply/rollback flow.

Additional context

I have an implementation ready and will open a PR shortly.

[debba]

Hi @ymadd there is an import clipboard component, have you been checked it?
Maybe we can use a part of it , or rid off, what do you think?

[ymadd]

Hi @debba, yes — I checked ClipboardImportModal / clipboardParser.ts before writing this. I'd keep both, because they solve different problems:

• Clipboard import creates/appends a table from clipboard data, so it infers a schema: header detection, type inference, column-name sanitization, empty-row filtering, and cell trimming.
• Grid paste (feat(datagrid): paste cells from clipboard (Cmd/Ctrl+V) #612) writes exact values into existing cells, so it must not trim, drop rows, or rename anything — values map positionally onto the grid and go through the pending-changes flow.

Reusing the import parser for paste would corrupt pasted values (trimming / row-dropping), and paste can't replace import since it can't create tables — so I don't think we can get rid of either one.

There is one genuinely shared piece: the quote-aware CSV cell splitter exists in both parseCsv (clipboardParser) and splitDelimitedLine (dataGrid). Happy to extract that into a single shared low-level helper in this PR if you'd like — the wrappers would stay separate since their semantics differ.