Add JSDoc documentation and file headers to all source files

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

src/stores/loading.ts

@@ -1,10 +1,24 @@
+// 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/loading Global loading spinner state management. */
+
 import { defineStore } from "pinia";
 
+/** Pinia store for managing the global loading spinner visibility. */
 export const useLoadingStore = defineStore('loadingStore', {
   state: () => ({
+    /** Whether the loading spinner is currently visible. */
     isLoading: true,
   }),
   actions: {
+    /**
+     * Sets the loading spinner visibility.
+     * @param {boolean} isLoadingBoolean - Whether to show the spinner.
+     */
     setIsLoading(isLoadingBoolean) {
       this.isLoading = isLoadingBoolean;
     }