MILAN, Aug 4 (Reuters) - Bending Spoons has agreed to buy Airtable in an all-cash deal valuing the U.S. software firm at $1.285 billion, the companies said on Tuesday, marking the Italian technology company's first acquisition since its Nasdaq debut last month. Founded in 2013, Airtable offers a software platform that combines spreadsheet and database capabilities, allowing companies to build applications and manage operational workflows without coding expertise.