Former top state aide Linda Sun lived large in a Long Island mansion with a Ferrari parked in the garage and Birkin handbag in her closet — all thanks to her alleged secret gig as a Chinese foreign agent , a court heard this week. Sun, who served under Gov. Kathy Hochul and her predecessor Andrew Cuomo — with a salary that never exceeded $145,000 per year during a decade-plus stint in Albany — could only afford the luxuries by cashing in on her lofty position to advance China’s agenda, federal