feat: add initial Nuxt frontend with SSR

frontend_nuxt/app.vue

@@ -0,0 +1,93 @@
+<template>
+  <div id="app">
+    <div class="header-container">
+      <HeaderComponent @toggle-menu="menuVisible = !menuVisible" :show-menu-btn="!hideMenu" />
+    </div>
+
+    <div class="main-container">
+      <div class="menu-container">
+        <MenuComponent :visible="!hideMenu && menuVisible" @item-click="menuVisible = false" />
+      </div>
+      <div class="content" :class="{ 'menu-open': menuVisible && !hideMenu }">
+        <NuxtPage />
+      </div>
+    </div>
+    <GlobalPopups />
+  </div>
+</template>
+
+<script>
+import HeaderComponent from '~/components/HeaderComponent.vue'
+import MenuComponent from '~/components/MenuComponent.vue'
+import GlobalPopups from '~/components/GlobalPopups.vue'
+
+export default {
+  name: 'App',
+  components: { HeaderComponent, MenuComponent, GlobalPopups },
+  data() {
+    return {
+      menuVisible: process.client ? window.innerWidth > 768 : false
+    }
+  },
+  computed: {
+    hideMenu() {
+      return [
+        '/login',
+        '/signup', 
+        '/404',
+        '/signup-reason',
+        '/github-callback',
+        '/twitter-callback',
+        '/discord-callback',
+        '/forgot-password',
+        '/google-callback'
+      ].includes(this.$route.path)
+    }
+  },
+  async mounted() {
+    // placeholder for future global initializations
+  },
+  methods: {}
+}
+</script>
+
+<style>
+.header-container {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  z-index: 1000;
+}
+
+.menu-container {}
+
+.content {
+  /* height: calc(100vh - var(--header-height)); */
+  padding-top: var(--header-height);
+  flex: 1;
+  max-width: 100%;
+  transition: max-width 0.3s ease;
+  background-color: var(--background-color);
+  min-height: calc(100vh - var(--header-height)); 
+}
+
+.content.menu-open {
+  max-width: calc(100% - var(--menu-width));
+}
+
+.main-container {
+  display: flex;
+  flex-direction: row;
+  max-width: var(--page-max-width);
+  margin: 0 auto;
+}
+
+@media (max-width: 768px) {
+
+  .content,
+  .content.menu-open {
+    max-width: 100% !important;
+  }
+}
+</style>