Fix: Filter system messages when loading from localStorage to handle legacy data

src/storage.js

@@ -20,7 +20,8 @@ export function loadConversationHistory() {
   if (saved) {
     try {
       const parsedHistory = JSON.parse(saved);
-      return parsedHistory;
+      // Filter out any system messages that might have been saved before our fix
+      return parsedHistory.filter(msg => msg.role !== 'system');
     } catch (e) {
       console.error('Error parsing conversation history:', e);
     }