fix(mac): size highlighted session rows

apps/macos/Sources/Clawdis/MenuSessionsInjector.swift

@@ -517,6 +517,7 @@ final class MenuSessionsInjector: NSObject, NSMenuDelegate {
 private final class HighlightedMenuItemHostView: NSView {
     private let baseView: AnyView
     private let hosting: NSHostingView<AnyView>
+    private var targetWidth: CGFloat
     private var tracking: NSTrackingArea?
     private var hovered = false {
         didSet { self.updateHighlight() }
@@ -525,20 +526,21 @@ private final class HighlightedMenuItemHostView: NSView {
     init(rootView: AnyView, width: CGFloat) {
         self.baseView = rootView
         self.hosting = NSHostingView(rootView: AnyView(rootView.environment(\.menuItemHighlighted, false)))
+        self.targetWidth = max(1, width)
         super.init(frame: .zero)
 
         self.addSubview(self.hosting)
         self.hosting.autoresizingMask = [.width, .height]
-        self.hosting.frame = self.bounds
-
-        self.frame.size.width = max(1, width)
-        let size = self.fittingSize
-        self.frame.size.height = size.height
+        self.updateSizing()
     }
 
     @available(*, unavailable)
     required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }
 
+    override var intrinsicContentSize: NSSize {
+        self.hosting.fittingSize
+    }
+
     override func updateTrackingAreas() {
         super.updateTrackingAreas()
         if let tracking {
@@ -579,6 +581,13 @@ private final class HighlightedMenuItemHostView: NSView {
 
     private func updateHighlight() {
         self.hosting.rootView = AnyView(self.baseView.environment(\.menuItemHighlighted, self.hovered))
+        self.updateSizing()
         self.needsDisplay = true
     }
+
+    private func updateSizing() {
+        self.hosting.frame.size.width = self.targetWidth
+        let size = self.hosting.fittingSize
+        self.frame = NSRect(origin: .zero, size: NSSize(width: self.targetWidth, height: size.height))
+    }
 }