Let me tell you about my friend Sarah in Montclair. She turned her sunroom into a home office when her company went remote, thinking she’d hit the tax deduction jackpot. “It’s perfect,” she said, “I’ve got my desk, my monitors, and a view of my neighbor’s prize-winning hydrangeas.” What she didn’t have? A clue about how home office deductions actually work in New Jersey. Spoiler alert: Those hydrangeas didn’t help her tax return one bit.…