switch to a fresh vue/vite project and appy just the basic sakai theme

frontend/src/stores/counter.js

@@ -0,0 +1,12 @@
+import { ref, computed } from 'vue';
+import { defineStore } from 'pinia';
+
+export const useCounterStore = defineStore('counter', () => {
+    const count = ref(0);
+    const doubleCount = computed(() => count.value * 2);
+    function increment() {
+        count.value++;
+    }
+
+    return { count, doubleCount, increment };
+});