Day 6 of building Cursor for SpreadSheets: powered by aisdk and syncfusion SpreadSheet

Now Quick Edit can
- change formats (bold, underline, border color, thinkness, color, background color and everything else)
- merge and unmerge cells
- change values
- change formulas

You can also undo/redo.

Day 4 of building Cursor for Spreadsheets
AI Ctrl + K Quick Edit is Completed.

Claude, GPT-5, Gemini - all of them hallucinated Syncfusion's API. Even pasting the entire docs into the prompt didn't help.

So I went old-school: docs + console logs + endless tinkering. Finally, it works.