refactor(mac): inject context card as NSMenuItem view

apps/macos/Sources/Clawdis/MenuContextCardInjector.swift

@@ -0,0 +1,47 @@
+import AppKit
+import SwiftUI
+
+@MainActor
+final class MenuContextCardInjector: NSObject, NSMenuDelegate {
+    static let shared = MenuContextCardInjector()
+
+    private let tag = 9_415_227
+    private let cardWidth: CGFloat = 320
+
+    func install(into statusItem: NSStatusItem) {
+        // SwiftUI owns the menu, but we can inject a custom NSMenuItem.view right before display.
+        statusItem.menu?.delegate = self
+    }
+
+    func menuWillOpen(_ menu: NSMenu) {
+        // Remove any previous injected card items.
+        for item in menu.items where item.tag == self.tag {
+            menu.removeItem(item)
+        }
+
+        guard let insertIndex = self.findInsertIndex(in: menu) else { return }
+
+        let cardView = ContextMenuCardView(width: self.cardWidth)
+        let hosting = NSHostingView(rootView: cardView)
+        let size = hosting.fittingSize
+        hosting.frame = NSRect(origin: .zero, size: NSSize(width: self.cardWidth, height: size.height))
+
+        let item = NSMenuItem()
+        item.tag = self.tag
+        item.view = hosting
+        item.isEnabled = false
+
+        menu.insertItem(item, at: insertIndex)
+    }
+
+    private func findInsertIndex(in menu: NSMenu) -> Int? {
+        // Prefer inserting before the "Send Heartbeats" toggle item.
+        if let idx = menu.items.firstIndex(where: { $0.title == "Send Heartbeats" }) {
+            return idx
+        }
+        // Fallback: insert after the first two rows (active toggle + status).
+        if menu.items.count >= 2 { return 2 }
+        return menu.items.count
+    }
+}
+