Add Injected property wrapper with reactive DI observer cleanup

Sources/LuminateDI/Injected.swift

@@ -0,0 +1,32 @@
+import Adwaita
+import Foundation
+
+@propertyWrapper
+public struct Injected<T> {
+
+    private let keyPath: KeyPath<InjectionValues, T?>
+    private let observerRef: ObserverRef
+
+    public var wrappedValue: T {
+        DIContainer.shared.resolve(keyPath)
+    }
+
+    public init(_ keyPath: KeyPath<InjectionValues, T?>) {
+        self.keyPath = keyPath
+        self.observerRef = ObserverRef()
+        observerRef.id = DIContainer.shared.addObserver(for: keyPath) {
+            Task { @MainActor in
+                StateManager.updateViews()
+            }
+        }
+    }
+}
+
+private final class ObserverRef {
+    var id: UUID?
+    deinit {
+        if let id {
+            DIContainer.shared.removeObserver(id)
+        }
+    }
+}