removed .formSheet modalPresentationStyle for tvOS 26 due to CI failure

Author: MiaKoring

Sources/SwiftCrossUI/Views/Modifiers/SheetModifier.swift

@@ -1,7 +1,7 @@
 extension View {
     /// Presents a conditional modal overlay. `onDismiss` gets invoked when the sheet is dismissed.
     ///
-    /// Internal modalPresentationStyle falls back to .overFullScreen (non-opaque) on tvOS 18 and earlier.
+    /// Internal UIViewController.modalPresentationStyle falls back to .overFullScreen (non-opaque) on tvOS.
     public func sheet<SheetContent: View>(
         isPresented: Binding<Bool>, onDismiss: (() -> Void)? = nil,
         @ViewBuilder content: @escaping () -> SheetContent

Sources/UIKitBackend/UIKitBackend+Sheet.swift

@@ -9,11 +9,7 @@ extension UIKitBackend {
         #if !os(tvOS)
             sheet.modalPresentationStyle = .formSheet
         #else
-            if #available(tvOS 26.0, *) {
-                sheet.modalPresentationStyle = .formSheet
-            } else {
-                sheet.modalPresentationStyle = .overFullScreen
-            }
+            sheet.modalPresentationStyle = .overFullScreen
         #endif
         sheet.view = content.view
         return sheet