Fix SSR compatibility and complete Nuxt SSG migration

Agent-Logs-Url: https://github.com/hykilpikonna/corner/sessions/5ad4b623-9a6b-480e-80fa-d83eee774f01

Co-authored-by: hykilpikonna <22280294+hykilpikonna@users.noreply.github.com>

src/scripts/global.ts

@@ -1,4 +1,4 @@
-import {BlogMeta} from "@/scripts/models";
+import type {BlogMeta} from "@/scripts/models";
 
 export let globals = {
   staticMeta: {tags: [], categories: [], posts: []} as BlogMeta,

src/scripts/router.ts

@@ -1,4 +1,5 @@
-import {NavigationFailure, useRoute, useRouter} from 'vue-router'
+import {useRoute, useRouter} from 'vue-router'
+import type {NavigationFailure} from 'vue-router'
 
 export function pushQuery(query: {[id: string]: string | null}): Promise<void | NavigationFailure | undefined> {
   const route = useRoute()