Live Activity Content Density

Nucleic-Session: B3643133-163C-4C5D-BE20-1A6B7FB83DA9
Co-authored-by: Nucleic <[email protected]>

NucleicRemote/NucleicRemote/LiveActivityManager.swift

@@ -17,6 +17,17 @@ final class LiveActivityManager {
 
     private var activity: Activity<NucleicSessionAttributes>?
 
+    /// The last content we pushed. Updates that don't change it are skipped so we don't spend
+    /// ActivityKit's update budget on no-ops — `sync` fires on every host message (dashboard,
+    /// connectivity, pong, diff ticks…), most of which leave the aggregate identical. Burning the
+    /// budget on those is exactly what makes a *real* change land late and the glance read stale.
+    private var lastState: NucleicSessionAttributes.ContentState?
+    /// The newest state waiting to be applied, and the single task draining it. Coalescing to the
+    /// latest through one serial task means the newest data always wins — firing an unstructured
+    /// `Task` per `sync` let a later update lose a race to an earlier one and freeze the glance.
+    private var pendingState: NucleicSessionAttributes.ContentState?
+    private var updateTask: Task<Void, Never>?
+
     /// Reconcile the Activity with the current session set.
     func sync(hostName: String, sessions: [WireSessionSummary]) {
         guard ActivityAuthorizationInfo().areActivitiesEnabled else { return }