Fix virtual mic audio linking (#62)

* Fix virtual mic audio linking by managing it in AudioPlayer lifecycle

- Moved `link_player_to_virtual_mic` to `src/utils/pipewire.rs` and updated it to return a termination sender.
- Added `player_link_sender` to `AudioPlayer` to manage the PipeWire link between the daemon and the virtual mic.
- Integrated linking logic into `AudioPlayer::play` and `AudioPlayer::update` to ensure the link is established when audio starts playing.
- Ensured the link is terminated in `AudioPlayer::drop_stream` when the audio sink is closed.
- Removed redundant and potentially failing startup linking loop from the daemon.
- Fixed log spam by ensuring `link_player` is only attempted when necessary and errors are handled gracefully.
- Maintained compatibility with stable Rust by avoiding unstable features.

Co-authored-by: arabianq <55220741+arabianq@users.noreply.github.com>

* small refactor

* refactor

---------

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

src/utils/daemon.rs

@@ -2,10 +2,10 @@ use crate::{
     types::{
         audio_player::AudioPlayer,
         config::DaemonConfig,
-        socket::{Request, Response, MAX_MESSAGE_SIZE},
+        socket::{MAX_MESSAGE_SIZE, Request, Response},
     },
-    utils::pipewire::{create_link, get_device},
 };
+
 use std::os::unix::fs::PermissionsExt;
 use std::path::PathBuf;
 use std::{error::Error, fs};
@@ -38,44 +38,6 @@ pub fn get_daemon_config() -> DaemonConfig {
     })
 }
 
-pub async fn link_player_to_virtual_mic() -> Result<(), Box<dyn Error>> {
-    let pwsp_daemon_output;
-    if let Ok(device) = get_device("pwsp-daemon").await {
-        pwsp_daemon_output = device;
-    } else {
-        return Err(
-            "Could not find alsa_playback.pwsp-daemon device, skipping device linking".into(),
-        );
-    }
-
-    let pwsp_daemon_input;
-    if let Ok(device) = get_device("pwsp-virtual-mic").await {
-        pwsp_daemon_input = device;
-    } else {
-        return Err("Could not find pwsp-virtual-mic device, skipping device linking".into());
-    }
-
-    let output_fl = pwsp_daemon_output
-        .clone()
-        .output_fl
-        .expect("Failed to get pwsp-daemon output_fl");
-    let output_fr = pwsp_daemon_output
-        .clone()
-        .output_fr
-        .expect("Failed to get pwsp-daemon output_fl");
-    let input_fl = pwsp_daemon_input
-        .clone()
-        .input_fl
-        .expect("Failed to get pwsp-daemon input_fl");
-    let input_fr = pwsp_daemon_input
-        .clone()
-        .input_fr
-        .expect("Failed to get pwsp-daemon input_fr");
-    create_link(output_fl, output_fr, input_fl, input_fr)?;
-
-    Ok(())
-}
-
 pub fn get_runtime_dir() -> PathBuf {
     dirs::runtime_dir().unwrap_or(PathBuf::from("/run/pwsp"))
 }