patch_mac.diff

--- mac/Sources/PixShell/UI/ConnectOverlay.swift
+++ mac/Sources/PixShell/UI/ConnectOverlay.swift
@@ -13,6 +13,8 @@
     private let stepLabel = NSTextField(labelWithString: "")
     private let bar = IndeterminateBar()
     private var stepTimer: Timer?
     private var stepIndex = 0
+    private let cancelBtn = NSButton(title: "取消", target: nil, action: nil)
+    var onCancel: (() -> Void)?
 
     /// 分步文案（对齐真实 SSH 流程的观感；不是真进度，只表达"在动"）
     private static let steps = ["正在建立 TCP 连接…", "SSH 握手…", "身份认证…", "打开会话…"]
@@ -35,10 +37,14 @@
         stepLabel.font = Theme.ui(12); stepLabel.textColor = Theme.muted
         stepLabel.alignment = .center
 
-        let stack = NSStackView(views: [pulse, titleLabel, stepLabel, bar])
+        cancelBtn.target = self
+        cancelBtn.action = #selector(cancelClicked)
+        cancelBtn.bezelStyle = .rounded
+
+        let stack = NSStackView(views: [pulse, titleLabel, stepLabel, bar, cancelBtn])
         stack.orientation = .vertical
         stack.alignment = .centerX
         stack.spacing = 12
         stack.translatesAutoresizingMaskIntoConstraints = false
         card.addSubview(stack)
@@ -52,6 +58,11 @@
         ])
     }
 
+    @objc private func cancelClicked() {
+        onCancel?()
+    }
+
     /// 开始：贴满 host 视图并播放动画。
     func show(in host: NSView, title: String) {
         stepTimer?.invalidate()