Standardize store exports to named useXxxStore convention

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

tests/stores/acctMgmt.test.js

@@ -16,7 +16,7 @@ vi.mock('@/api/client.js', () => ({
 vi.mock('@/stores/login.ts', () => {
   const { defineStore } = require('pinia');
   return {
-    default: defineStore('loginStore', {
+    useLoginStore: defineStore('loginStore', {
       state: () => ({
         userData: { username: 'currentUser', name: 'Current' },
       }),
@@ -27,7 +27,7 @@ vi.mock('@/stores/login.ts', () => {
   };
 });
 
-import useAcctMgmtStore from '@/stores/acctMgmt.ts';
+import { useAcctMgmtStore } from '@/stores/acctMgmt.ts';
 
 describe('acctMgmtStore', () => {
   let store;