Add JSDoc documentation and file headers to all source files

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

src/stores/compare.ts

@@ -1,7 +1,19 @@
+// The Lucia project.
+// Copyright 2023-2026 DSP, inc.  All rights reserved.
+// Authors:
+//   chiayin.kuo@dsp.im (chiayin), 2023/1/31
+//   imacat.yang@dsp.im (imacat), 2023/9/23
+//   cindy.chang@dsp.im (Cindy Chang), 2024/5/30
+/**
+ * @module stores/compare Performance comparison dashboard store
+ *   for fetching and managing comparison data between two files.
+ */
+
 import { defineStore } from "pinia";
 import apiClient from "@/api/client.js";
 import apiError from '@/module/apiError.js';
 
+/** Pinia store for the Compare Dashboard page data. */
 export const useCompareStore = defineStore('compareStore', {
   state: () => ({
     allCompareDashboardData: null,