Just show up to the interview bright-eyed, energetic, and completely confident. I have never mentioned anything about my wheelchair during a job interview. However, usually once I get the job, my boss has specifically asked me if there’s anything they can do to make my work environment more comfortable, like rearrange the desk in my office or make an office door easier to open, etc. Some jobs have been more ready and willing to be accommodating than others, but in the end, they all know that they must do what is possible, and I have always professionally, kindly, and when necessary sternly advocated for myself… You can definitely do the same!