feat: enhance audio processing and error handling in TTS backend; refactor user dialog form validation

qwen3-tts-frontend/src/lib/utils.ts

@@ -52,7 +52,7 @@ export function debounce<T extends (...args: any[]) => any>(
   func: T,
   wait: number
 ): (...args: Parameters<T>) => void {
-  let timeout: NodeJS.Timeout | null = null
+  let timeout: ReturnType<typeof setTimeout> | null = null
   return function(...args: Parameters<T>) {
     if (timeout) clearTimeout(timeout)
     timeout = setTimeout(() => func(...args), wait)