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/src/lib.rs

@@ -13,9 +13,13 @@ use std::sync::atomic::{AtomicBool, Ordering};
 
 use tauri::{
     menu::{MenuBuilder, MenuItemBuilder, PredefinedMenuItem},
-    tray::{MouseButton, MouseButtonState, TrayIcon, TrayIconBuilder, TrayIconEvent},
+    tray::{MouseButton, TrayIcon, TrayIconBuilder, TrayIconEvent},
     Emitter, Manager,
 };
+// MouseButtonState is only matched on non-Windows targets — on Windows the
+// tray uses DoubleClick which doesn't carry a button_state.
+#[cfg(not(target_os = "windows"))]
+use tauri::tray::MouseButtonState;
 
 /// Tracks which user-configured shortcuts are currently registered (shortcut_str → action).
 /// Prevents on_shortcut() accumulating duplicate handlers across JS reloads (HMR / StrictMode).