Initial commit — DLS lab-app Flutter project

macos/Runner/MainFlutterWindow.swift

@@ -0,0 +1,29 @@
+import Cocoa
+import FlutterMacOS
+
+class MainFlutterWindow: NSWindow {
+  override func awakeFromNib() {
+    let flutterViewController = FlutterViewController()
+
+    // Center window with a sensible default size
+    let screenSize = NSScreen.main?.frame.size ?? CGSize(width: 1440, height: 900)
+    let windowWidth: CGFloat = min(1280, screenSize.width * 0.85)
+    let windowHeight: CGFloat = min(820, screenSize.height * 0.85)
+    let origin = CGPoint(
+      x: (screenSize.width - windowWidth) / 2,
+      y: (screenSize.height - windowHeight) / 2
+    )
+    let windowFrame = NSRect(origin: origin, size: CGSize(width: windowWidth, height: windowHeight))
+
+    self.contentViewController = flutterViewController
+    self.setFrame(windowFrame, display: true)
+
+    // Keep sidebar always visible — desktop layout kicks in at 720px
+    self.minSize = CGSize(width: 880, height: 560)
+    self.titlebarAppearsTransparent = true
+
+    RegisterGeneratedPlugins(registry: flutterViewController)
+
+    super.awakeFromNib()
+  }
+}