ios: fix chat list subscription status indicator stuck at empty "%"

The toolbar-hosted indicator held its subscription totals in @State and refreshed them via a 1s poll; the toolbar rebuilds frequently, recreating the view and resetting the @State totals to the empty "share unknown" state. Move the totals into a dedicated SubsStatusModel observable (a shared singleton, like ChannelRelaysModel/ConnectProgressManager) so they survive view recreation, instead of binding poll state into the widely-observed ChatModel. The poll publishes only on change (SMPServerSubs is now Equatable), so the indicator does not re-render every idle second.

apps/ios/Shared/Model/AppAPITypes.swift

@@ -2382,7 +2382,7 @@ struct ServerSessions: Codable {
     var hasSess: Bool { ssConnected > 0 }
 }
 
-struct SMPServerSubs: Codable {
+struct SMPServerSubs: Codable, Equatable {
     var ssActive: Int
     var ssPending: Int
 

apps/ios/Shared/Model/ChatModel.swift

@@ -359,6 +359,24 @@ class ChannelRelaysModel: ObservableObject {
     }
 }
 
+// Subscription totals for the chat list status indicator. Kept in a dedicated
+// observable (not on ChatModel) so they survive the toolbar-hosted indicator
+// being recreated on frequent toolbar rebuilds, without waking ChatModel's many
+// observers on every poll tick.
+class SubsStatusModel: ObservableObject {
+    static let shared = SubsStatusModel()
+    @Published var totalSubs: SMPServerSubs = SMPServerSubs.newSMPServerSubs
+    @Published var hasSession: Bool = false
+
+    func update(_ totalSubs: SMPServerSubs, _ hasSession: Bool) {
+        // only publish on change - avoid re-rendering the indicator on every idle poll tick
+        if self.totalSubs != totalSubs || self.hasSession != hasSession {
+            self.totalSubs = totalSubs
+            self.hasSession = hasSession
+        }
+    }
+}
+
 // Spec: spec/state.md#ChatModel
 final class ChatModel: ObservableObject {
     @Published var onboardingStage: OnboardingStage?

apps/ios/Shared/Views/ChatList/ChatListView.swift

@@ -559,8 +559,8 @@ struct ChatListView: View {
 }
 
 struct SubsStatusIndicator: View {
-    @State private var subs: SMPServerSubs = SMPServerSubs.newSMPServerSubs
-    @State private var hasSess: Bool = false
+    // Totals live on a dedicated observable so they survive this view being recreated on frequent toolbar rebuilds
+    @ObservedObject private var subsModel = SubsStatusModel.shared
     @State private var task: Task<Void, Never>?
     @State private var showServersSummary = false
 
@@ -572,9 +572,9 @@ struct SubsStatusIndicator: View {
         } label: {
             HStack(spacing: 4) {
                 Text("Chats").foregroundStyle(Color.primary).fixedSize().font(.headline)
-                SubscriptionStatusIndicatorView(subs: subs, hasSess: hasSess)
+                SubscriptionStatusIndicatorView(subs: subsModel.totalSubs, hasSess: subsModel.hasSession)
                 if showSubscriptionPercentage {
-                    SubscriptionStatusPercentageView(subs: subs, hasSess: hasSess)
+                    SubscriptionStatusPercentageView(subs: subsModel.totalSubs, hasSess: subsModel.hasSession)
                 }
             }
         }
@@ -598,8 +598,7 @@ struct SubsStatusIndicator: View {
                     do {
                         let (subs, hasSess) = try await getAgentSubsTotal()
                         await MainActor.run {
-                            self.subs = subs
-                            self.hasSess = hasSess
+                            SubsStatusModel.shared.update(subs, hasSess)
                         }
                     } catch let error {
                         logger.error("getSubsTotal error: \(responseError(error))")