feat: Add Mic Sensitivity Noise Gate slider and core audio gating

src/app/mod.rs

@@ -39,6 +39,7 @@ pub enum AppMessage {
     PeerVolumeChanged(EndpointId, f32),
     InputDeviceSelected(AudioDevice),
     OutputDeviceSelected(AudioDevice),
+    NoiseGateChanged(f32),
     EventOccurred(Event),
     NavigateToSettings,
     NavigateBack,
@@ -89,6 +90,7 @@ impl Default for AppState {
         let _ = UI_RX.set(Mutex::new(Some(ui_rx)));
 
         let config = AppConfig::load();
+        let _ = controller.send(CoreCommand::SetNoiseGateThreshold(config.noise_gate_threshold));
         let all_devices = enumerate_audio_devices();
         let input_devices: Vec<_> = all_devices.iter().filter(|d| d.is_input).cloned().collect();
         let output_devices: Vec<_> = all_devices.iter().filter(|d| !d.is_input).cloned().collect();
@@ -251,6 +253,11 @@ fn update(state: &mut AppState, message: AppMessage) -> Task<AppMessage> {
             state.config.save();
             state.selected_output = Some(dev);
         }
+        AppMessage::NoiseGateChanged(val) => {
+            state.config.noise_gate_threshold = val;
+            state.config.save();
+            let _ = state.controller.send(CoreCommand::SetNoiseGateThreshold(val));
+        }
         AppMessage::EventOccurred(Event::Keyboard(keyboard::Event::KeyPressed { key, .. })) => {
             if state.is_setting_hotkey {
                 state.ptt_hotkey = key.clone();
@@ -384,6 +391,11 @@ fn view(state: &AppState) -> Element<'_, AppMessage> {
                         ).width(iced::Length::Fixed(160.0))
                     ].spacing(4),
                 ].spacing(10),
+                vertical_space(20.0),
+                column![
+                    text(format!("Mic Sensitivity (Noise Gate): {:.1}%", state.config.noise_gate_threshold * 100.0)).size(14).color(color_subtext),
+                    slider(0.0..=0.1, state.config.noise_gate_threshold, AppMessage::NoiseGateChanged)
+                ].spacing(10).width(iced::Length::Fixed(320.0)),
                 vertical_space(30.0),
                 button(
                     text("Back")