Add wander mode and About menu item

Neco/NecoApp.swift

@@ -25,6 +25,7 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
     private let litter = LitterField()
     private var pawsItem: NSMenuItem!
     private var scratchItem: NSMenuItem!
+    private var wanderItem: NSMenuItem!
     private var tick = 0
 
     private var side: CGFloat {
@@ -34,6 +35,7 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
     func applicationDidFinishLaunching(_: Notification) {
         let m = NSEvent.mouseLocation
         neko = Neko(pos: NSPoint(x: m.x - 120, y: m.y - 120))
+        neko.wandering = UserDefaults.standard.bool(forKey: "wandering")
 
         view = NekoView(frame: NSRect(x: 0, y: 0, width: side, height: side))
         view.neko = neko
@@ -129,10 +131,19 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
         menu.addItem(clear)
         menu.addItem(.separator())
 
+        wanderItem = NSMenuItem(title: "Wander", action: #selector(toggleWander), keyEquivalent: "")
+        wanderItem.target = self
+        wanderItem.state = neko.wandering ? .on : .off
+        menu.addItem(wanderItem)
+
         let pause = NSMenuItem(title: "Pause / Resume", action: #selector(togglePause), keyEquivalent: "p")
         pause.target = self
         menu.addItem(pause)
         menu.addItem(.separator())
+
+        let about = NSMenuItem(title: "About Neco", action: #selector(showAbout), keyEquivalent: "")
+        about.target = self
+        menu.addItem(about)
         // Target NSApp, not self: AppDelegate does not implement terminate:, so a
         // self target would leave the item auto-disabled (greyed out).
         let quit = NSMenuItem(title: "Quit Neco", action: #selector(NSApplication.terminate(_:)), keyEquivalent: "q")
@@ -169,6 +180,17 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
         litterView.needsDisplay = true
     }
 
+    @objc private func toggleWander() {
+        neko.wandering.toggle()
+        wanderItem.state = neko.wandering ? .on : .off
+        UserDefaults.standard.set(neko.wandering, forKey: "wandering")
+    }
+
+    @objc private func showAbout() {
+        NSApp.activate(ignoringOtherApps: true)
+        NSApp.orderFrontStandardAboutPanel(nil)
+    }
+
     private func startTimer() {
         // Target/selector Timer: it fires on the run loop it is scheduled on (main),
         // so tick stays on the MainActor without an unchecked assumeIsolated.

Neco/Neko.swift

@@ -23,6 +23,10 @@ enum Tuning {
 
     static let animTicks = 7 // run/idle frame swap cadence (~8fps, like the original)
     static let sleepAnimTicks = 30 // slower sleeping breath
+
+    /// Wander mode: instead of the cursor, chase a random on-screen point; once caught,
+    /// linger this long (seconds) before picking a new one and running off again.
+    static let wanderDwellRange = 0.4 ... 2.0
 }
 
 @MainActor
@@ -40,6 +44,19 @@ final class Neko {
     private var tick = 0
     private var stateStart = 0
 
+    /// Wander mode: chase random on-screen points instead of the cursor. Turning it on
+    /// immediately picks a first destination so the cat sets off right away.
+    var wandering = false {
+        didSet {
+            guard wandering, wandering != oldValue else { return }
+            pickWanderTarget()
+        }
+    }
+
+    private var wanderTarget = NSPoint.zero
+    private var wanderDwell = 0.0 // seconds to linger at the current target before moving on
+    private var idleSince = 0 // last tick the cat was moving; the dwell timer counts from here
+
     init(pos: NSPoint) {
         self.pos = pos
     }
@@ -71,8 +88,18 @@ final class Neko {
         stateStart = tick
     }
 
-    func update(mouse: NSPoint) {
+    /// The cat is heading somewhere: running toward a target, or waking to do so.
+    private var isMoving: Bool {
+        switch motion {
+        case .running, .awake: true
+        default: false
+        }
+    }
+
+    func update(mouse rawMouse: NSPoint) {
         tick += 1
+        let mouse = wandering ? advanceWander() : rawMouse
+
         let dx = mouse.x - pos.x
         let dy = mouse.y - pos.y
         let dist = hypot(dx, dy)
@@ -165,6 +192,32 @@ final class Neko {
         }
     }
 
+    /// Wander mode's stand-in for the cursor. The cat keeps moving until it settles,
+    /// lingers for wanderDwell, then a fresh destination pulls the target away and wakes
+    /// it — the same way real cursor movement does. Returns the current target point.
+    private func advanceWander() -> NSPoint {
+        if isMoving {
+            idleSince = tick
+        } else if Double(tick - idleSince) / 60.0 >= wanderDwell {
+            pickWanderTarget()
+        }
+        return wanderTarget
+    }
+
+    /// Pick a fresh random destination for wander mode: a random point (kept off the
+    /// very edges) on a randomly chosen screen. Reset the dwell clock so the cat runs
+    /// off before it is eligible to settle again.
+    private func pickWanderTarget() {
+        let frame = (NSScreen.screens.randomElement() ?? NSScreen.main)?.frame ?? .zero
+        let m = Tuning.edgeMargin
+        wanderTarget = NSPoint(
+            x: .random(in: (frame.minX + m) ... max(frame.minX + m, frame.maxX - m)),
+            y: .random(in: (frame.minY + m) ... max(frame.minY + m, frame.maxY - m))
+        )
+        wanderDwell = .random(in: Tuning.wanderDwellRange)
+        idleSince = tick
+    }
+
     /// Which sprite to show right now.
     var frame: String {
         let phase = (tick / Tuning.animTicks) % 2