CRITICAL FIX: restore chat functionality - sendMessage must be generator

- Change sendMessage to async generator function with yield*
- Fixes 'Error: sendMessage(...) is not iterable' error
- Restores chat functionality in Hermes modal

src/uncloseai-embed-modal.js

@@ -25,9 +25,9 @@ async function speakChatText(text, voice, speed) {
 	return await speakText(text, voice, speed);
 }
 
-async function sendMessage(message) {
+async function* sendMessage(message) {
 	const { sendMessage } = await import("./chat.js");
-	return sendMessage(message);
+	yield* sendMessage(message);
 }
 
 async function* sendMessageWithCustomHistory(history) {