feat: 新增未登录占位组件 LoggedOutView

IosClientKit/Sources/CoreUI/LoggedOutView.swift

@@ -0,0 +1,20 @@
+import SwiftUI
+
+/// 未登录占位视图（打卡/计划/我的页复用）。
+public struct LoggedOutView: View {
+    private let onNavigateToAuth: () -> Void
+
+    public init(onNavigateToAuth: @escaping () -> Void) {
+        self.onNavigateToAuth = onNavigateToAuth
+    }
+
+    public var body: some View {
+        ContentUnavailableView {
+            Label("未登录", systemImage: "lock")
+        } description: {
+            Text("登录后即可查看")
+        } actions: {
+            Button("去登录", action: onNavigateToAuth)
+        }
+    }
+}