refactor(gui): replace unsafe unwrap on gui thread lock (#23)

Replaces `audio_player_state_shared.lock().unwrap()` with `.unwrap_or_else(|e| e.into_inner())` in `src/utils/gui.rs` to allow safe recovery from poisoned locks and avoid application panics.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

src/types/commands.rs

@@ -197,7 +197,7 @@ impl Executable for GetVolumeCommand {
         let volume = audio_player.get_volume(self.id);
 
         if let Some(volume) = volume {
-        Response::new(true, volume.to_string())
+            Response::new(true, volume.to_string())
         } else {
             Response::new(false, "Failed to get volume")
         }