feat!(mac): add ui screens + text clawdis-mac

apps/macos/Sources/Clawdis/UIScreenService.swift

@@ -0,0 +1,44 @@
+import AppKit
+import ClawdisIPC
+import CoreGraphics
+
+enum UIScreenService {
+    static func listScreens() -> [UIScreenInfo] {
+        let screens = NSScreen.screens
+        let mainScreen = NSScreen.main
+
+        return screens.enumerated().map { index, screen in
+            UIScreenInfo(
+                index: index,
+                name: screen.peekabooName,
+                frame: screen.frame,
+                visibleFrame: screen.visibleFrame,
+                isPrimary: screen == mainScreen,
+                scaleFactor: screen.backingScaleFactor,
+                displayID: screen.displayID)
+        }
+    }
+}
+
+private extension NSScreen {
+    var displayID: UInt32 {
+        if let num = self.deviceDescription[NSDeviceDescriptionKey("NSScreenNumber")] as? NSNumber {
+            return num.uint32Value
+        }
+        return 0
+    }
+
+    /// Match Peekaboo's `ScreenService` naming (built-in vs. resolution fallback).
+    var peekabooName: String {
+        let id = self.displayID
+        guard id != 0 else { return "Display" }
+        if CGDisplayIsBuiltin(id) != 0 { return "Built-in Display" }
+
+        if let mode = CGDisplayCopyDisplayMode(id) {
+            return "\(mode.pixelWidth)×\(mode.pixelHeight) Display"
+        }
+
+        return "External Display"
+    }
+}
+