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/auth.js

@@ -5,8 +5,7 @@ import router from '@/scripts/customer/customer-router'
 import { handleError } from '@/scripts/customer/helpers/error-handling'
 const { global } = window.i18n
 
-export const useAuthStore = defineStore({
-  id: 'customerAuth',
+export const useAuthStore = defineStore('customerAuth', {
   state: () => ({
     loginData: {
       email: '',