chore: add jsdocs

Author: bang9

packages/uikit-react-native/src/contexts/SBUHandlersCtx.tsx

@@ -1,7 +1,19 @@
 import React from 'react';
 
 export interface SBUHandlers {
+  /**
+   * Callback function to handle opening a URL.
+   * This is triggered when a URL needs to be opened.
+   */
   onOpenURL: (url: string) => void;
+
+  /**
+   * Callback function to handle opening a file URL.
+   * This is triggered when a file URL needs to be opened.
+   *
+   * Note that this function is also called redundantly
+   * when `onPressMediaMessage` handler is triggered by clicking on media messages containing images, videos, or audio.
+   */
   onOpenFileURL: (url: string) => void;
 }