Refactored everything into modules.

public/js/kokoro-handler.js

@@ -3,7 +3,7 @@
  * Uses the kokoro-js library for high-quality TTS
  */
 
-class KokoroHandler {
+export class KokoroHandler {
   constructor() {
     this.enabled = false;
     this.speaking = false;
@@ -593,5 +593,5 @@ class KokoroHandler {
   }
 }
 
-// Don't create a global instance here - the factory will do this
-// const ttsHandler = new KokoroHandler();
+// Create and export a singleton for the factory to use
+export const kokoroHandler = new KokoroHandler();