Refactored everything into modules.

public/js/input-handler.js

@@ -2,7 +2,7 @@
  * Input Handler Module
  * Manages the multi-line text input field with a custom cursor.
  */
-class InputHandler {
+export class InputHandler {
   constructor(inputId = 'player_input', cursorId = 'cursor') {
     this.playerInput = document.getElementById(inputId);
     this.cursor = document.getElementById(cursorId);
@@ -288,6 +288,3 @@ class InputHandler {
     */
   }
 }
-
-// Export the class if using modules (optional, depends on build setup)
-// export default InputHandler;