Вынес превью на отдельную страницу

src/views/PreviewView.vue

@@ -0,0 +1,23 @@
+<script setup>
+import { onMounted } from 'vue'
+import { useRouter } from 'vue-router'
+import CodeView from '@/components/CodeView.vue'
+import { useFlightCode } from '@/composables/useFlightCode'
+
+const router = useRouter()
+const { finallyText } = useFlightCode()
+
+onMounted(() => {
+    if (!finallyText.value.trim()) {
+        router.replace({ name: 'planner' })
+    }
+})
+
+function goBack() {
+    router.push({ name: 'planner' })
+}
+</script>
+
+<template>
+    <CodeView v-if="finallyText" :code="finallyText" @back="goBack" />
+</template>