Mac GUI app (tkinter + Playwright) for bulk-editing invoice pay dates
on Stampli's Select to Pay dashboard. Features:
- Scan MUI DataGrid rows via virtual scroll
- Auto-calculate pay dates (due - 5 days, business day adjusted)
- Bulk edit pay date cells via calendar input
- Filter to error-free invoices, select all, submit for payment
- Scan Pending Approval tab to verify edits
- PyInstaller .app bundle with custom icon
