Updated ad placeholder graphics, update Modrinth App sidebar to mockup designs (#4584)

* Update ad placeholders to new green graphic

* Remove rounded corners from app ad frame

* Improve web ad placeholder styling

* Revamp app sidebar to match mockups more closely, greatly improve friends UX, fix up context menus and typify shit

* only show overflow on hover

* lint

* intl:extract

* clean up the inline code in FriendsSection

packages/ui/src/utils/common-messages.ts

@@ -25,6 +25,10 @@ export const commonMessages = defineMessages({
 		id: 'button.cancel',
 		defaultMessage: 'Cancel',
 	},
+	clearButton: {
+		id: 'button.clear',
+		defaultMessage: 'Clear',
+	},
 	closeButton: {
 		id: 'button.close',
 		defaultMessage: 'Close',