Fix daemon autostart issue caused by sync pipewire retry loop (#43)

At boot time, PipeWire takes some time to register the `pwsp-daemon` and `pwsp-virtual-mic` devices. Previously, the daemon's retry loop for `link_player_to_virtual_mic()` was synchronous and limited to 5 attempts (1.5 seconds total). This caused systemd autostarts to fail with a code 1 if the devices were not yet available.

This change replaces the synchronous wait with an asynchronous `tokio::spawn` task. It will retry the link attempt up to 60 times with a 1-second delay without blocking the startup of the rest of the daemon. This prevents it from exiting abruptly during autostart.

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

src/types/audio_player.rs

@@ -280,16 +280,18 @@ impl AudioPlayer {
     ) -> Result<u32, Box<dyn Error>> {
         let path_buf = file_path.to_path_buf();
 
-        let decoder_result = tokio::task::spawn_blocking(move || -> Result<_, Box<dyn Error + Send + Sync>> {
-            if !path_buf.exists() {
-                return Err(format!("File does not exist: {}", path_buf.display()).into());
-            }
+        let decoder_result =
+            tokio::task::spawn_blocking(move || -> Result<_, Box<dyn Error + Send + Sync>> {
+                if !path_buf.exists() {
+                    return Err(format!("File does not exist: {}", path_buf.display()).into());
+                }
 
-            let file = fs::File::open(&path_buf)?;
-            let decoder = Decoder::try_from(file).map_err(|e| Box::new(e) as Box<dyn Error + Send + Sync>)?;
-            Ok(decoder)
-        })
-        .await?;
+                let file = fs::File::open(&path_buf)?;
+                let decoder = Decoder::try_from(file)
+                    .map_err(|e| Box::new(e) as Box<dyn Error + Send + Sync>)?;
+                Ok(decoder)
+            })
+            .await?;
 
         match decoder_result {
             Ok(source) => {