More UI Changes? Not sure why they didn't go previously

LabWise/AppState.swift

@@ -0,0 +1,58 @@
+import SwiftUI
+import LabWiseKit
+
+@Observable
+final class AppState {
+    var isAuthenticated: Bool = false
+    var currentUser: AuthUser?
+
+    static let shared = AppState()
+
+    private let authClient = AuthClient()
+
+    private init() {
+        // Wire 401 handler
+        APIClient.shared.onUnauthorized = { [weak self] in
+            guard let self else { return }
+            Task { @MainActor in
+                self.signedOut()
+            }
+        }
+
+        // If a session cookie exists, validate it with the server on launch
+        let hasCookie = HTTPCookieStorage.shared.cookies?.contains {
+            $0.name == "__Secure-better-auth.session_token" || $0.name == "better-auth.session_token"
+        } ?? false
+        if hasCookie {
+            // Optimistically show the authenticated UI, then validate
+            isAuthenticated = true
+            Task { @MainActor [weak self] in
+                await self?.validateExistingSession()
+            }
+        }
+    }
+
+    @MainActor
+    private func validateExistingSession() async {
+        do {
+            let user = try await authClient.fetchCurrentUser()
+            currentUser = user
+            isAuthenticated = true
+        } catch {
+            // Cookie was stale or invalid
+            signedOut()
+        }
+    }
+
+    @MainActor
+    func signedIn(user: AuthUser) {
+        currentUser = user
+        isAuthenticated = true
+    }
+
+    @MainActor
+    func signedOut() {
+        currentUser = nil
+        isAuthenticated = false
+    }
+}