fixed build problems of webapp

webapp/package.json

@@ -13,6 +13,9 @@
     "format": "prettier --write src/"
   },
   "dependencies": {
+    "vue-google-charts": "^1.1.0",
+    "vue3-calendar-heatmap": "^2.0.5",
+    "tippy.js": "^6.3.7",
     "@popperjs/core": "^2.11.8",
     "bootstrap": "^5.3.3",
     "bootstrap-icons-vue": "^1.11.3",

webapp/src/components/CalendarChart.vue

@@ -8,7 +8,7 @@
 import { defineComponent } from 'vue';
 import { CalendarHeatmap } from 'vue3-calendar-heatmap'
 import { authHeader, handleResponse } from '@/utils/authentication';
-let data: Array<{ date: Date; count: number; }>;
+let data: Array<{ date: Date; count: number; }> = [];
 
 export default defineComponent({
     components: {

webapp/yarn

@@ -0,0 +1 @@
+/usr/share/nodejs/yarn/bin/yarn