feat: Puente Mayúscula-Minúscula + TTS SpeechSynthesis + E2E fixes

lib/speech.ts

@@ -0,0 +1,29 @@
+"use client"
+
+let utterance: SpeechSynthesisUtterance | null = null
+
+export async function speak(
+  text: string,
+  _rate = 0.85,
+): Promise<void> {
+  return new Promise((resolve) => {
+    stopSpeaking()
+
+    const u = new SpeechSynthesisUtterance(text)
+    u.lang = "es-AR"
+    u.rate = _rate
+
+    u.onend = () => resolve()
+    u.onerror = () => resolve()
+
+    utterance = u
+    speechSynthesis.speak(u)
+  })
+}
+
+export function stopSpeaking(): void {
+  if (utterance) {
+    speechSynthesis.cancel()
+    utterance = null
+  }
+}