feat: error handing: alert -> dialog

frontend/src/App.vue

@@ -1,11 +1,19 @@
 <script setup lang="ts">
 import PostScheme from './post/PostScheme.vue';
 import AuthorScheme from "./author/AuthorScheme.vue";
-import MultiSelect from './components/selects/MultiSelect.vue';
+import { Dialog } from 'primevue';
+import { useErrorStore } from './stores/error.store';
 
+const errorStore = useErrorStore()
 </script>
 
 <template>
+    <Dialog v-model:visible="errorStore.show" maximizable class="w-[400px] h-[400px]">
+        <template #header>
+            Ошибка
+        </template>
+            <h1 class="text-red-500 text-2xl">{{ errorStore.message }}</h1>
+    </Dialog>
     <main class="w-screen h-screen">
          <AuthorScheme></AuthorScheme>
     </main>