Convert all store files from JavaScript to TypeScript

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

src/main.ts

@@ -2,7 +2,7 @@ import { createApp, markRaw } from "vue";
 
 import App from "./App.vue";
 import router from "./router";
-import pinia from '@/stores/main.js';
+import pinia from '@/stores/main';
 import moment from 'moment';
 import mitt from 'mitt';
 import ToastPlugin from 'vue-toast-notification';