wip(Layout): Layout developing

src/components/Screenfull/index.ts

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+import Screenfull from './src/Screenfull.vue'
+
+export { Screenfull }

src/components/Screenfull/src/Screenfull.vue

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+<script setup lang="ts">
+import { Icon } from '@/components/Icon'
+import { useFullscreen } from '@vueuse/core'
+
+const { toggle, isFullscreen } = useFullscreen()
+
+function toggleFullscreen() {
+  toggle()
+}
+</script>
+
+<template>
+  <div @click="toggleFullscreen">
+    <Icon :size="18" :icon="isFullscreen ? 'zmdi:fullscreen-exit' : 'zmdi:fullscreen'" />
+  </div>
+</template>