fix start restart bugs

src/auracast/server/multicast_frontend.py

@@ -51,7 +51,7 @@ if audio_mode in ["Webapp", "USB"]:
     # Input device selection for USB mode
     if audio_mode == "USB":
         try:
-            resp = requests.get(f"{BACKEND_URL}/audio_inputs", timeout=1)
+            resp = requests.get(f"{BACKEND_URL}/audio_inputs")
             if resp.status_code == 200:
                 input_options = [f"{d['id']}:{d['name']}" for d in resp.json().get('inputs', [])]
             else:
@@ -71,6 +71,10 @@ if audio_mode in ["Webapp", "USB"]:
             selected_option = st.selectbox("Input Device", input_options, index=input_options.index(default_input))
         with col2:
             if st.button("Refresh"):
+                try:
+                    requests.post(f"{BACKEND_URL}/refresh_audio_inputs", timeout=3)
+                except Exception as e:
+                    st.error(f"Failed to refresh devices: {e}")
                 st.rerun()
         # We send only the numeric/card identifier (before :) or 'default'
         input_device = selected_option.split(":", 1)[0] if ":" in selected_option else selected_option