Features:
- Spreadsheet-like table with cell navigation (arrow keys)
- Formula bar for editing cell values
- Click and drag cell selection with Shift+Arrow extend
- Column resize by dragging header borders, double-click for best fit
- Editable headers via double-click
- Command palette (Cmd+P) with 12 commands
- Copy/Cut/Paste with CSV, Markdown, and Jira formats
- Insert rows/columns above/below/left/right
- File drag-and-drop to open CSV files
- Native Open/Save dialogs
- Go backend for CSV parsing, formatting, and file I/O
- Vanilla JS frontend, no frameworks
Co-authored-by: Shelley <shelley@exe.dev>
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