Add real-time character counter for text box input

[dineshsutihar]

Add real-time character counter for text box input

This feature gives users a dynamic character count as they type or delete text in the input box. The counter updates in real-time, displaying the number of characters entered. Newlines are excluded from the count to reflect actual character input.

• Display character count below the text box
• Real-time updates as the user types
• Exclude newline characters from the count

Resolves #3760