chore: consolidate parallel-session WIP (HOLD — do not push)

Local snapshot of intermingled in-flight work, committed to unblock the encode
refactor (a clean ffmpeg_win.rs for the vbv-dedup follow-on). These hunks span
the same files and can't be cleanly split here; the commit bundles three
distinct workstreams that each belong in their own PR:

  - logging rework (~43 files: level re-tiering, structured fields, `?e`,
    hot-path flood latches)
  - conflicting-host detection (detect.rs + detect/{linux,windows}.rs + wiring
    in main.rs/mgmt.rs/Cargo.toml/docs/packaging)
  - standby-sink DWM-stall attribution (windows/display_events.rs + capture/
    vdisplay wiring)

NOT verified as a combination. NOT to be pushed until the refactor is done and
these are re-verified and reorganized into their proper per-workstream PRs.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/punktfunk-tray/src/status.rs

@@ -37,6 +37,11 @@ pub struct Summary {
     /// host that doesn't send it deserializes as 0.
     #[serde(default)]
     pub kept_displays: u32,
+    /// Other Moonlight-compatible hosts (Sunshine/Apollo/…) the host detected on this machine at
+    /// startup — side-by-side use is unsupported. `#[serde(default)]` so an older host omitting it
+    /// deserializes as empty.
+    #[serde(default)]
+    pub conflicts: Vec<String>,
 }
 
 #[derive(Clone, Copy, Debug, PartialEq, serde::Deserialize)]
@@ -69,25 +74,41 @@ impl TrayStatus {
             TrayStatus::Starting => "punktfunk host — starting…".into(),
             TrayStatus::Degraded => "punktfunk host — running (status unavailable)".into(),
             TrayStatus::Error(e) => format!("punktfunk host — failed ({e})"),
-            TrayStatus::Running(s) => match (&s.session, s.video_streaming) {
-                (Some(sess), true) => format!(
-                    "punktfunk host {} — streaming {}×{}@{}",
-                    s.version, sess.width, sess.height, sess.fps
-                ),
-                (_, true) => format!("punktfunk host {} — streaming", s.version),
-                // Idle, but surface a kept (lingering/pinned) display: it — and, under an exclusive
-                // topology, your physical monitors — is being held. Release it from the console.
-                _ if s.kept_displays > 0 => format!(
-                    "punktfunk host {} — idle · {} display{} kept",
-                    s.version,
-                    s.kept_displays,
-                    if s.kept_displays == 1 { "" } else { "s" }
-                ),
-                _ => format!("punktfunk host {} — idle", s.version),
-            },
+            TrayStatus::Running(s) => {
+                let base = match (&s.session, s.video_streaming) {
+                    (Some(sess), true) => format!(
+                        "punktfunk host {} — streaming {}×{}@{}",
+                        s.version, sess.width, sess.height, sess.fps
+                    ),
+                    (_, true) => format!("punktfunk host {} — streaming", s.version),
+                    // Idle, but surface a kept (lingering/pinned) display: it — and, under an
+                    // exclusive topology, your physical monitors — is being held. Release it from
+                    // the console.
+                    _ if s.kept_displays > 0 => format!(
+                        "punktfunk host {} — idle · {} display{} kept",
+                        s.version,
+                        s.kept_displays,
+                        if s.kept_displays == 1 { "" } else { "s" }
+                    ),
+                    _ => format!("punktfunk host {} — idle", s.version),
+                };
+                // A conflicting Moonlight host (Sunshine/Apollo/…) is the loudest thing to say —
+                // side-by-side use is unsupported, so lead the tooltip with it.
+                if s.conflicts.is_empty() {
+                    base
+                } else {
+                    format!("⚠ conflicting host: {} — {base}", s.conflicts.join(", "))
+                }
+            }
         }
     }
 
+    /// The host detected another Moonlight-compatible host (Sunshine/Apollo/…) on this machine —
+    /// unsupported side-by-side. Drives the tray's attention state.
+    pub fn has_conflicts(&self) -> bool {
+        matches!(self, TrayStatus::Running(s) if !s.conflicts.is_empty())
+    }
+
     pub fn is_streaming(&self) -> bool {
         matches!(self, TrayStatus::Running(s) if s.video_streaming)
     }
@@ -445,6 +466,7 @@ mod tests {
             pin_pending: false,
             pending_approvals: 0,
             kept_displays: 0,
+            conflicts: Vec::new(),
         }
     }
 
@@ -487,6 +509,17 @@ mod tests {
         }
     }
 
+    #[test]
+    fn conflicts_drive_attention_and_lead_the_tooltip() {
+        let mut s = summary(false);
+        assert!(!TrayStatus::Running(s.clone()).has_conflicts());
+        s.conflicts = vec!["Sunshine (running)".into(), "Apollo".into()];
+        let st = TrayStatus::Running(s);
+        assert!(st.has_conflicts());
+        let head = st.headline();
+        assert!(head.starts_with("⚠ conflicting host: Sunshine (running), Apollo"));
+    }
+
     #[test]
     fn headline_shows_session_and_reason() {
         assert_eq!(