Widgets work

frontend/app/components/viewer/widgets/TestWidget.vue

@@ -1,3 +1,13 @@
+<script setup>
+const props = defineProps(['content']);
+
+const name = ref('');
+
+onMounted(() => {
+    name.value = props.content || 'No content';
+});
+</script>
+
 <template>
-<h2>This is a test widget</h2>
+<h2>This is a {{name}} widget</h2>
 </template>