Fix: Improve esc() function to safely handle null/undefined and prevent UI issues

[Khushi5623]

Changes Made

• Improved esc() function to handle null and undefined values safely
• Ensured all inputs are converted to string before escaping
• Added fallback safety using try-catch

Problem

The previous implementation did not handle null or undefined values properly, which could result in unexpected UI output such as "undefined" or rendering issues.

Solution

Added input validation and safe string conversion to ensure consistent and secure rendering.

Impact

• Prevents UI glitches caused by invalid values
• Improves robustness of rendering logic
• Enhances stability and safety