add pinia

frontend/src/stores/index.ts

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+import { store } from 'quasar/wrappers'
+import { createPinia } from 'pinia'
+import { Router } from 'vue-router';
+
+/*
+ * When adding new properties to stores, you should also
+ * extend the `PiniaCustomProperties` interface.
+ * @see https://pinia.vuejs.org/core-concepts/plugins.html#typing-new-store-properties
+ */
+declare module 'pinia' {
+  export interface PiniaCustomProperties {
+    readonly router: Router;
+  }
+}
+
+/*
+ * If not building with SSR mode, you can
+ * directly export the Store instantiation;
+ *
+ * The function below can be async too; either use
+ * async/await or return a Promise which resolves
+ * with the Store instance.
+ */
+
+export default store((/* { ssrContext } */) => {
+  const pinia = createPinia()
+
+  // You can add Pinia plugins here
+  // pinia.use(SomePiniaPlugin)
+
+  return pinia
+})

frontend/src/stores/store-flag.d.ts

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+/* eslint-disable */
+// THIS FEATURE-FLAG FILE IS AUTOGENERATED,
+//  REMOVAL OR CHANGES WILL CAUSE RELATED TYPES TO STOP WORKING
+import "quasar/dist/types/feature-flag";
+
+declare module "quasar/dist/types/feature-flag" {
+  interface QuasarFeatureFlags {
+    store: true;
+  }
+}

frontend/src/stores/testStore.ts

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+import { defineStore } from 'pinia';
+
+export const useCounterStore = defineStore('counter', {
+  state: () => ({
+    counter: 0
+  }),
+
+  getters: {
+    doubleCount (state) {
+      return state.counter * 2;
+    }
+  },
+
+  actions: {
+    increment () {
+      this.counter++;
+    }
+  }
+});