refactor(macos): dedupe UI, pairing, and runtime helpers

apps/macos/Sources/OpenClaw/GatewayDiscoverySelectionSupport.swift

@@ -0,0 +1,22 @@
+import OpenClawDiscovery
+
+@MainActor
+enum GatewayDiscoverySelectionSupport {
+    static func applyRemoteSelection(
+        gateway: GatewayDiscoveryModel.DiscoveredGateway,
+        state: AppState)
+    {
+        if state.remoteTransport == .direct {
+            state.remoteUrl = GatewayDiscoveryHelpers.directUrl(for: gateway) ?? ""
+        } else {
+            state.remoteTarget = GatewayDiscoveryHelpers.sshTarget(for: gateway) ?? ""
+        }
+        if let endpoint = GatewayDiscoveryHelpers.serviceEndpoint(for: gateway) {
+            OpenClawConfigFile.setRemoteGatewayUrl(
+                host: endpoint.host,
+                port: endpoint.port)
+        } else {
+            OpenClawConfigFile.clearRemoteGatewayUrl()
+        }
+    }
+}