updated voice, avatar and frontend to reflect changes

frontend/js/chat.js

@@ -81,6 +81,14 @@ document.addEventListener('DOMContentLoaded', async () => {
     const voice = new VoiceManager();
     await voice.init();
 
+    // Disable mic button if no STT method is available
+    if (voice.isDisabled) {
+        voiceBtn.disabled = true;
+        voiceBtn.title = 'Voice input requires Chrome or Edge (with HTTPS)';
+        voiceBtn.style.opacity = '0.35';
+        voiceBtn.style.cursor = 'not-allowed';
+    }
+
     voice.onResult = (text) => {
         inputEl.value = text;
         voice.lastInputWasVoice = true;