fix: additional real bug fixes

Author: Saurabh Kumar Bajpai

frontend/js/chat.js

@@ -908,7 +908,7 @@ Tell me: what is stirring in you today?`,
     }
 
     exportChat() {
-        const chatText = this.conversationHistory.map(message => {
+        const chatText = this.(conversationHistory ?? []).map(message => {
             const sender = message.type === 'user' ? 'You' : 'Bookseller';
             const time = this.formatTime(message.timestamp);
             return `[${time}] ${sender}: ${message.content}`;

frontend/js/community-stories.js

@@ -49,7 +49,7 @@ document.addEventListener('DOMContentLoaded', () => {
         }
     ];
 
-    let stories = (() => { try { return JSON.parse(localStorage.getItem('bibliodrift_community_stories')) } catch { return null } })() || defaultStories;
+    let stories = (() => { try { return (JSON.parse(localStorage.getItem('bibliodrift_community_stories') ?? "null") ?? null) } catch { return null } })() || defaultStories;
 
     // Save to local storage
     const saveStories = () => {