fix: suppress Rust compiler warnings in buttplug

- #[allow(dead_code)] on FFICallbackContextWrapper, Connected variant,
  Unsubscribe variant, and device_event_receiver field
- let _ = for unused Result from callback.call1() (x2) and .send().await

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/buttplug/src/webbluetooth/webbluetooth_hardware.rs

@@ -184,6 +184,7 @@ impl HardwareSpecializer for WebBluetoothHardwareSpecializer {
 pub enum WebBluetoothEvent {
   // This is the only way we have to get our endpoints back to device creation
   // right now. My god this is a mess.
+  #[allow(dead_code)]
   Connected(Vec<Endpoint>),
   Disconnected,
 }
@@ -201,6 +202,7 @@ pub enum WebBluetoothDeviceCommand {
     HardwareSubscribeCmd,
     oneshot::Sender<Result<(), ButtplugDeviceError>>,
   ),
+  #[allow(dead_code)]
   Unsubscribe(
     HardwareUnsubscribeCmd,
     oneshot::Sender<Result<(), ButtplugDeviceError>>,
@@ -271,7 +273,7 @@ async fn run_webbluetooth_loop(
   //let web_btle_device = WebBluetoothDeviceImpl::new(device, char_map);
   info!("device created!");
   let endpoints = char_map.keys().into_iter().cloned().collect();
-  device_local_event_sender
+  let _ = device_local_event_sender
     .send(WebBluetoothEvent::Connected(endpoints))
     .await;
   while let Some(msg) = device_command_receiver.recv().await {
@@ -337,6 +339,7 @@ async fn run_webbluetooth_loop(
 #[derive(Debug)]
 pub struct WebBluetoothHardware {
   device_command_sender: mpsc::Sender<WebBluetoothDeviceCommand>,
+  #[allow(dead_code)]
   device_event_receiver: mpsc::Receiver<WebBluetoothEvent>,
   event_sender: broadcast::Sender<HardwareEvent>,
 }