Calculator App using React, TypeScript, Styled-Components

Hi everyone,

This is my first time using TypeScript, so any specific feedback relating to that would be awesome!

I'm also wondering whether the way I've implemented the theme toggle is correct, or is this a situation where I should be using the Context API?

Some things I may work on later:

1. Ensuring users can click an operator instead of having to click the equals button before they can start a new calculation.
2. Making the calculator more accessible by allowing users to use keyboard buttons for numbers.

Any other feedback on how to do the above or any other feedback would be appreciated.

Thanks!