chore(warnings): silence cpal lifetime + unused tray import on Windows

- patches/cpal-0.15.3 wasapi device.rs: annotate MutexGuard return with
  '_ so mismatched_lifetime_syntaxes stops firing.
- lib.rs: gate the MouseButtonState import to non-Windows targets (the
  Windows tray uses DoubleClick and never pattern-matches it).

Cosmetic only, no behavioural change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src-tauri/patches/cpal-0.15.3/src/host/wasapi/device.rs

@@ -342,7 +342,7 @@ impl Device {
     /// Ensures that `future_audio_client` contains a `Some` and returns a locked mutex to it.
     fn ensure_future_audio_client(
         &self,
-    ) -> Result<MutexGuard<Option<IAudioClientWrapper>>, windows::core::Error> {
+    ) -> Result<MutexGuard<'_, Option<IAudioClientWrapper>>, windows::core::Error> {
         let mut lock = self.future_audio_client.lock().unwrap();
         if lock.is_some() {
             return Ok(lock);