add connectionStatus state and component

src/render/components/header.vue

@@ -9,6 +9,7 @@
         class="menuButton minimizeButton"
         @click.prevent="postNavBarMin"
       />
+      <connection-status />
     </span>
 </template>
 
@@ -18,8 +19,11 @@
     import { defineComponent } from "vue";
     import { postNavBar } from "@/render/ipc";
 
+    import ConnectionStatus from "./connectionStatus.vue";
+
     export default defineComponent({
         name: "Header",
+        components: { ConnectionStatus },
         setup() {
             const postNavBarExit = () => postNavBar('close');
             const postNavBarMin = () => postNavBar('min');