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

apps/macos/Sources/OpenClaw/MicRefreshSupport.swift

@@ -0,0 +1,46 @@
+import Foundation
+import SwiftUI
+
+enum MicRefreshSupport {
+    private static let refreshDelayNs: UInt64 = 300_000_000
+
+    static func startObserver(_ observer: AudioInputDeviceObserver, triggerRefresh: @escaping @MainActor () -> Void) {
+        observer.start {
+            Task { @MainActor in
+                triggerRefresh()
+            }
+        }
+    }
+
+    @MainActor
+    static func schedule(
+        refreshTask: inout Task<Void, Never>?,
+        action: @escaping @MainActor () async -> Void)
+    {
+        refreshTask?.cancel()
+        refreshTask = Task { @MainActor in
+            try? await Task.sleep(nanoseconds: self.refreshDelayNs)
+            guard !Task.isCancelled else { return }
+            await action()
+        }
+    }
+
+    static func selectedMicName<T>(
+        selectedID: String,
+        in devices: [T],
+        uid: KeyPath<T, String>,
+        name: KeyPath<T, String>) -> String
+    {
+        guard !selectedID.isEmpty else { return "" }
+        return devices.first(where: { $0[keyPath: uid] == selectedID })?[keyPath: name] ?? ""
+    }
+
+    @MainActor
+    static func voiceWakeBinding(for state: AppState) -> Binding<Bool> {
+        Binding(
+            get: { state.swabbleEnabled },
+            set: { newValue in
+                Task { await state.setVoiceWakeEnabled(newValue) }
+            })
+    }
+}