UI tweaks (#23346)

* remove redundant per-view toasters in settings

* add variants to standardize dialog footer button layouts

* remove text-md

this class name compiles to nothing in tailwind. we used to add it to prevent iOS from zooming when focusing on an input, but that is now solved via the viewport meta in index.html

* make wizard footers consistent with dialog footers

* consistent destructive button style

remove text-white from individual buttons and add it to the variant