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/base/Avatar.vue

@@ -2,7 +2,7 @@
 	<img
 		v-if="src && !failed"
 		ref="img"
-		class="`experimental-styles-within avatar shrink-0"
+		class="avatar shrink-0"
 		:style="`--_size: ${cssSize}`"
 		:class="{
 			circle: circle,
@@ -18,7 +18,7 @@
 	/>
 	<svg
 		v-else
-		class="`experimental-styles-within avatar shrink-0"
+		class="avatar shrink-0"
 		:style="`--_size: ${cssSize}${tint ? `;--_tint:oklch(50% 75% ${tint})` : ''}`"
 		:class="{
 			tint: tint,