chore: clean up a bunch of legacy styles (#5973)

* remove unused experimental-styles-within

* remove unused styles

* more cleanup + prepr

* Refactor nearly all legacy buttons to use ButtonStyled

* prepr

* Update MC account selector to modern version

* prepr

---------

Co-authored-by: Calum H. <calum@modrinth.com>

packages/ui/src/components/servers/backups/BackupRenameModal.vue

@@ -23,7 +23,7 @@
 		<template #actions>
 			<div class="flex gap-2 justify-end">
 				<ButtonStyled type="outlined">
-					<button class="!border !border-surface-4" @click="hide">
+					<button @click="hide">
 						<XIcon />
 						Cancel
 					</button>