Moved UI to client folder to fix HMR

app/imports/client/ui/properties/treeNodeViews/ClassLevelTreeNode.vue

@@ -0,0 +1,22 @@
+<template lang="html">
+  <div class="layout align-center justify-start">
+    <property-icon
+      v-if="!hideIcon"
+      class="mr-2"
+      :model="model"
+      :color="model.color"
+      :class="selected && 'primary--text'"
+    />
+    <div class="text-no-wrap text-truncate">
+      {{ title }} {{ model.level }}
+    </div>
+  </div>
+</template>
+
+<script lang="js">
+import treeNodeViewMixin from '/imports/client/ui/properties/treeNodeViews/treeNodeViewMixin.js';
+
+export default {
+  mixins: [treeNodeViewMixin],
+}
+</script>