fix: undefined functions/properties across frontend (#4210)

* fix: notification mark as read

* revert: composition API change

* fix: categories

* feat: enable vue/no-undef-properties in 'warn' mode.

* fix: app undefined properties

* revert: ss block

* fix: eslint-disable for [version].vue

apps/frontend/src/pages/auth/welcome.vue

@@ -52,6 +52,8 @@ import { RightArrowIcon, WavingRinthbot } from '@modrinth/assets'
 import { Checkbox, commonMessages } from '@modrinth/ui'
 import { IntlFormatted } from '@vintl/vintl/components'
 
+import { normalizeChildren } from '@/utils/vue-children.ts'
+
 const route = useRoute()
 
 const { formatMessage } = useVIntl()