fix: Add error handling to get_analytics_summary

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

app.py

@@ -1227,7 +1227,11 @@ def get_analytics_summary() -> str:
     """Get the conversation analytics summary"""
     if not ANALYTICS_AVAILABLE or analytics is None:
         return "### 📊 Analytics\n\nAnalytics module not available."
-    return analytics.get_summary()
+    try:
+        return analytics.get_summary()
+    except Exception as e:
+        logger.error(f"[ANALYTICS_ERROR] get_summary failed: {e}")
+        return f"### 📊 Analytics\n\nError generating summary: {e}"
 
 
 def refresh_analytics() -> str: