Update Nuxt to v3.12.1 (#1720)

* Update Nuxt dependencies

* Fix ref access in ChartDisplay

* Fix feature flags cookie options type error

* Specify type-only imports

* Fix shorthands access to tags outside of reactive scope

* Replace most useRoute calls with useRoute from vue-router

Nuxt's version of this composable is horrendously broken (nuxt/nuxt#21340)

* Import all svgs with ?component parameter

Fixes weird hydration issues + gives correct type

pages/flags.vue

@@ -1,5 +1,9 @@
 <script setup lang="ts">
-import { FeatureFlag, DEFAULT_FEATURE_FLAGS, saveFeatureFlags } from '~/composables/featureFlags.ts'
+import {
+  type FeatureFlag,
+  DEFAULT_FEATURE_FLAGS,
+  saveFeatureFlags,
+} from '~/composables/featureFlags.ts'
 
 const flags = shallowReactive(useFeatureFlags().value)
 </script>