refactor(swift): share discovery status text

apps/ios/Sources/Gateway/GatewayDiscoveryModel.swift

@@ -136,43 +136,9 @@ final class GatewayDiscoveryModel {
     }
 
     private func updateStatusText() {
-        let states = Array(self.statesByDomain.values)
-        if states.isEmpty {
-            self.statusText = self.browsers.isEmpty ? "Idle" : "Setup"
-            return
-        }
-
-        if let failed = states.first(where: { state in
-            if case .failed = state { return true }
-            return false
-        }) {
-            if case let .failed(err) = failed {
-                self.statusText = "Failed: \(err)"
-                return
-            }
-        }
-
-        if let waiting = states.first(where: { state in
-            if case .waiting = state { return true }
-            return false
-        }) {
-            if case let .waiting(err) = waiting {
-                self.statusText = "Waiting: \(err)"
-                return
-            }
-        }
-
-        if states.contains(where: { if case .ready = $0 { true } else { false } }) {
-            self.statusText = "Searching…"
-            return
-        }
-
-        if states.contains(where: { if case .setup = $0 { true } else { false } }) {
-            self.statusText = "Setup"
-            return
-        }
-
-        self.statusText = "Searching…"
+        self.statusText = GatewayDiscoveryStatusText.make(
+            states: Array(self.statesByDomain.values),
+            hasBrowsers: !self.browsers.isEmpty)
     }
 
     private static func prettyState(_ state: NWBrowser.State) -> String {