Working spreadsheet view, pending UI updates

LabWise/LabWiseApp.swift

@@ -1,8 +1,23 @@
 import SwiftUI
 import LabWiseKit
+import UIKit
+
+// Controls which orientations are allowed app-wide at runtime.
+// SpreadsheetView flips this to .landscape; all other screens use .allButUpsideDown.
+final class AppDelegate: NSObject, UIApplicationDelegate {
+    static var orientationLock: UIInterfaceOrientationMask = .allButUpsideDown
+
+    func application(
+        _ application: UIApplication,
+        supportedInterfaceOrientationsFor window: UIWindow?
+    ) -> UIInterfaceOrientationMask {
+        AppDelegate.orientationLock
+    }
+}
 
 @main
 struct LabWiseApp: App {
+    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
     @State private var appState = AppState.shared
 
     var body: some Scene {