refactor: node tools and canvas host url

apps/macos/Sources/Clawdis/AsyncTimeout.swift

@@ -0,0 +1,22 @@
+import Foundation
+
+enum AsyncTimeout {
+    static func withTimeout<T: Sendable>(
+        seconds: Double,
+        onTimeout: @escaping @Sendable () -> Error,
+        operation: @escaping @Sendable () async throws -> T) async throws -> T
+    {
+        let clamped = max(0, seconds)
+        return try await withThrowingTaskGroup(of: T.self) { group in
+            group.addTask { try await operation() }
+            group.addTask {
+                try await Task.sleep(nanoseconds: UInt64(clamped * 1_000_000_000))
+                throw onTimeout()
+            }
+            let result = try await group.next()
+            group.cancelAll()
+            if let result { return result }
+            throw onTimeout()
+        }
+    }
+}