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/layouts/wrapped/hosting/manage/backups.vue

@@ -100,7 +100,7 @@
 						>
 							<template #actions>
 								<ButtonStyled type="outlined">
-									<button class="!border !border-surface-4" @click="clearBackupFilters">
+									<button @click="clearBackupFilters">
 										{{ formatMessage(messages.clearFilters) }}
 									</button>
 								</ButtonStyled>