feat(screenshare): integrate desktop audio exclusion

tests/screenshare_host_fault.rs

@@ -22,6 +22,7 @@ use std::time::Duration;
 
 use peerspeak::core::CoreController;
 use peerspeak::core::messages::{CoreCommand, UiEvent};
+use peerspeak::screenshare::ShareAudioSelection;
 
 const EVENT_TIMEOUT: Duration = Duration::from_secs(20);
 /// How long to listen for events that must NOT arrive. Comfortably past the
@@ -117,7 +118,7 @@ async fn a_dead_host_is_torn_down_and_a_clean_stop_stays_clean() {
 
     // ── Half 1: the host dies mid-share ─────────────────────────────────────
     assert!(controller.send(CoreCommand::StartScreenShare {
-        audio_app: None,
+        audio: ShareAudioSelection::DesktopShared,
         settings: Default::default(),
         quality: Default::default(),
     }));
@@ -159,7 +160,7 @@ async fn a_dead_host_is_torn_down_and_a_clean_stop_stays_clean() {
         living_host.to_string_lossy().into_owned()
     ))));
     assert!(controller.send(CoreCommand::StartScreenShare {
-        audio_app: None,
+        audio: ShareAudioSelection::DesktopShared,
         settings: Default::default(),
         quality: Default::default(),
     }));
@@ -211,7 +212,7 @@ async fn a_dead_host_is_torn_down_and_a_clean_stop_stays_clean() {
     // killed host's EOF passes the staleness gate and a spurious "ended
     // unexpectedly" lands on top of the ticket error (Gemini review, P2-1).
     assert!(controller.send(CoreCommand::StartScreenShare {
-        audio_app: None,
+        audio: ShareAudioSelection::DesktopShared,
         settings: Default::default(),
         quality: Default::default(),
     }));
@@ -361,7 +362,7 @@ async fn a_host_fault_pulls_the_ticket_off_presence_within_the_grace() {
     .await;
 
     assert!(controller.send(CoreCommand::StartScreenShare {
-        audio_app: None,
+        audio: ShareAudioSelection::DesktopShared,
         settings: Default::default(),
         quality: Default::default(),
     }));
@@ -534,7 +535,7 @@ async fn stop_share_ends_the_real_host_via_sigint_within_the_grace() {
     // after its ticket (capture starts on first viewer) — exactly the state a
     // Stop Share most often hits.
     assert!(controller.send(CoreCommand::StartScreenShare {
-        audio_app: None,
+        audio: ShareAudioSelection::DesktopShared,
         settings: Default::default(),
         quality: Default::default(),
     }));