Upgrade Pinia from v2 to v3 (#596)

Migrate all 37 store definitions from the deprecated object-with-id
signature to the string-id-first signature required by Pinia 3:

  defineStore({ id: 'name', ... }) → defineStore('name', { ... })

resources/scripts/customer/stores/invoice.js

@@ -1,8 +1,7 @@
 import { handleError } from '@/scripts/customer/helpers/error-handling'
 const { defineStore } = window.pinia
 import http from '@/scripts/http'
-export const useInvoiceStore = defineStore({
-  id: 'customerInvoiceStore',
+export const useInvoiceStore = defineStore('customerInvoiceStore', {
   state: () => ({
     totalInvoices: 0,
     invoices: [],