Convert all store files from JavaScript to TypeScript

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

src/components/Compare/SidebarStates.vue

@@ -147,7 +147,7 @@
   </Sidebar>
 </template>
 <script>
-import { useCompareStore } from '@/stores/compare.js';
+import { useCompareStore } from '@/stores/compare';
 import { getTimeLabel } from '@/module/timeLabel.js';
 import getMoment from 'moment';