fix(tray): allow has_conflicts on non-Linux (Windows -D warnings dead-code)

has_conflicts drives the Linux ksni backend's NeedsAttention state; the Windows
tray surfaces the same conflict through the tooltip headline() (it has no distinct
attention icon) and never calls the boolean, so `cargo clippy -p punktfunk-tray
-- -D warnings` failed dead-code on Windows (windows-host.yml). Scope the allow to
non-Linux rather than gate the shared API out.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/punktfunk-tray/src/status.rs

@@ -104,7 +104,11 @@ impl TrayStatus {
     }
 
     /// The host detected another Moonlight-compatible host (Sunshine/Apollo/…) on this machine —
-    /// unsupported side-by-side. Drives the tray's attention state.
+    /// unsupported side-by-side. Drives the Linux (ksni) backend's `NeedsAttention` state; the
+    /// Windows backend surfaces the same conflict through the tooltip `headline()` instead (it has
+    /// no distinct attention icon), so this accessor is unused there — allow it per-platform rather
+    /// than gate the shared API out.
+    #[cfg_attr(not(target_os = "linux"), allow(dead_code))]
     pub fn has_conflicts(&self) -> bool {
         matches!(self, TrayStatus::Running(s) if !s.conflicts.is_empty())
     }