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

apps/macos/Sources/OpenClaw/SimpleTaskSupport.swift

@@ -0,0 +1,31 @@
+import Foundation
+
+@MainActor
+enum SimpleTaskSupport {
+    static func start(task: inout Task<Void, Never>?, operation: @escaping @Sendable () async -> Void) {
+        guard task == nil else { return }
+        task = Task {
+            await operation()
+        }
+    }
+
+    static func stop(task: inout Task<Void, Never>?) {
+        task?.cancel()
+        task = nil
+    }
+
+    static func startDetachedLoop(
+        task: inout Task<Void, Never>?,
+        interval: TimeInterval,
+        operation: @escaping @Sendable () async -> Void)
+    {
+        guard task == nil else { return }
+        task = Task.detached {
+            await operation()
+            while !Task.isCancelled {
+                try? await Task.sleep(nanoseconds: UInt64(interval * 1_000_000_000))
+                await operation()
+            }
+        }
+    }
+}