add server: show progress bar when resolving

QueueCube/Views/Settings View/AddServerView.swift

@@ -75,6 +75,12 @@ struct AddServerView: View
                                 Image(systemName: "network")
                                 Text("\(server.displayName)")
                                     .bold()
+                                
+                                Spacer()
+                                if model.resolvingServers.contains(server) {
+                                    ProgressView()
+                                        .progressViewStyle(.circular)
+                                }
                             }
                         }
                         .tint(.primary)
@@ -90,6 +96,8 @@ struct AddServerView: View
     
     private func resolveEndpoint(_ endpoint: DiscoveredEndpoint) {
         Task {
+            model.resolvingServers.insert(endpoint)
+            
             let server = try await endpoint.resolve()
             onAddServer(server)
         }
@@ -104,6 +112,8 @@ struct AddServerView: View
         var validationState: ValidationState = .empty
         
         var discoveredServers: [DiscoveredEndpoint] = []
+        var resolvingServers = Set<DiscoveredEndpoint>()
+        
         private let browser = NWBrowser(for: .bonjour(type: "_queuecube._tcp.", domain: nil), using: .tcp)
         
         private var validationTimer: Timer? = nil
@@ -180,7 +190,7 @@ struct AddServerView: View
     }
 }
 
-struct DiscoveredEndpoint: Identifiable
+struct DiscoveredEndpoint: Identifiable, Hashable
 {
     let endpoint: NWEndpoint
     let serviceName: String