MUI

The issues: Firestore index disappearing after deploy, Firestore deploy failing because "index already exists", deployment failing on installing Firebase CLI, MUI X Date Picker stopped informing about invalid date, warning about unnecessary React useEffect dependency on ref, and toast message unusable for copying.

I’ve been relying on Material UI Box components quite a lot, because doing so allows use of theme-aware sx property and common attributes such as display or gap. It makes code more consistent with other uses of MUI components.