feat: Push-to-talk on voice FAB button

- Hold FAB to open panel and start recording immediately
- Release to stop recording and send after 1s buffer
- Orange pulsing animation when PTT active
- PTT also works on record button inside modal
- Added stopRecordingAndSend exposed method

server/whisper_server.py

@@ -77,7 +77,7 @@ def convert_audio_to_wav(input_data: bytes, input_format: str = "webm") -> bytes
             pass
 
 # Configuration
-HOST = "localhost"
+HOST = "0.0.0.0"  # Listen on all interfaces (needed for Traefik proxy)
 PORT = 4104
 MODEL_SIZE = "large-v3"  # Best standard model for Spanish
 DEVICE = "cuda"  # cuda or cpu