Standardize store exports to named useXxxStore convention

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/stores/pageAdmin.js

@@ -7,7 +7,7 @@ const printPageAdminLog = false;
 // Therefore, we need to handle page transitions caused by both of these methods.
 // 至少有兩種方式引起畫面的導向: 點選導覽按鈕與重新整理網頁
 // 因此至少要處理這兩種方式所引起的畫面切換
-export default defineStore('pageAdminStore', {
+export const usePageAdminStore = defineStore('pageAdminStore', {
   state: () => ({
      activePage: 'MAP',
      previousPage: 'MAP',