fix(macos): prefer tailnet ip for auto bind

apps/macos/Sources/ClawdbotMacCLI/ConnectCommand.swift

@@ -1,6 +1,9 @@
 import ClawdbotKit
 import ClawdbotProtocol
 import Foundation
+#if canImport(Darwin)
+import Darwin
+#endif
 
 struct ConnectOptions {
     var url: String?
@@ -268,7 +271,7 @@ private func resolveGatewayEndpoint(opts: ConnectOptions, config: GatewayConfig)
     }
 
     let port = config.port ?? 18789
-    let host = "127.0.0.1"
+    let host = resolveLocalHost(bind: config.bind)
     guard let url = URL(string: "ws://\(host):\(port)") else {
         throw NSError(domain: "Gateway", code: 1, userInfo: [NSLocalizedDescriptionKey: "invalid url: ws://\(host):\(port)"])
     }
@@ -304,3 +307,56 @@ private func resolvedPassword(opts: ConnectOptions, mode: String, config: Gatewa
     }
     return config.password
 }
+
+private func resolveLocalHost(bind: String?) -> String {
+    let normalized = (bind ?? "").trimmingCharacters(in: .whitespacesAndNewlines).lowercased()
+    let tailnetIP = detectTailnetIPv4()
+    switch normalized {
+    case "tailnet", "auto":
+        return tailnetIP ?? "127.0.0.1"
+    default:
+        return "127.0.0.1"
+    }
+}
+
+private func detectTailnetIPv4() -> String? {
+    var addrList: UnsafeMutablePointer<ifaddrs>?
+    guard getifaddrs(&addrList) == 0, let first = addrList else { return nil }
+    defer { freeifaddrs(addrList) }
+
+    for ptr in sequence(first: first, next: { $0.pointee.ifa_next }) {
+        let flags = Int32(ptr.pointee.ifa_flags)
+        let isUp = (flags & IFF_UP) != 0
+        let isLoopback = (flags & IFF_LOOPBACK) != 0
+        let family = ptr.pointee.ifa_addr.pointee.sa_family
+        if !isUp || isLoopback || family != UInt8(AF_INET) { continue }
+
+        var addr = ptr.pointee.ifa_addr.pointee
+        var buffer = [CChar](repeating: 0, count: Int(NI_MAXHOST))
+        let result = getnameinfo(
+            &addr,
+            socklen_t(ptr.pointee.ifa_addr.pointee.sa_len),
+            &buffer,
+            socklen_t(buffer.count),
+            nil,
+            0,
+            NI_NUMERICHOST)
+        guard result == 0 else { continue }
+        let len = buffer.prefix { $0 != 0 }
+        let bytes = len.map { UInt8(bitPattern: $0) }
+        guard let ip = String(bytes: bytes, encoding: .utf8) else { continue }
+        if isTailnetIPv4(ip) { return ip }
+    }
+
+    return nil
+}
+
+private func isTailnetIPv4(_ address: String) -> Bool {
+    let parts = address.split(separator: ".")
+    guard parts.count == 4 else { return false }
+    let octets = parts.compactMap { Int($0) }
+    guard octets.count == 4 else { return false }
+    let a = octets[0]
+    let b = octets[1]
+    return a == 100 && b >= 64 && b <= 127
+}