完善样片管理列表、详情与上传页 UI 交互。

对齐 Android 样片模块布局与加载状态，补充共享 UI 组件与图片资源，并增强列表解析容错与单元测试覆盖。

Co-authored-by: Cursor <cursoragent@cursor.com>

suixinkan/UI/SampleManagement/SampleManagementUI.swift

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+//
+//  SampleManagementUI.swift
+//  suixinkan
+//
+
+import SnapKit
+import UIKit
+
+/// 样片管理模块视觉常量，严格对应 Android Compose 页面中的 dp、颜色与圆角。
+enum SampleManagementUITokens {
+    static let pageBackground = UIColor(hex: 0xF4F4F4)
+    static let inputBackground = UIColor(hex: 0xF4F4F4)
+    static let border = UIColor(hex: 0xEEEEEE)
+    static let placeholder = UIColor(hex: 0xB6BECA)
+    static let text563 = UIColor(hex: 0x4B5563)
+    static let statText = UIColor(hex: 0x6B7280)
+    static let screenInset: CGFloat = 16
+    static let sectionSpacing: CGFloat = 12
+    static let cardRadius: CGFloat = 12
+    static let fieldRadius: CGFloat = 8
+}
+
+/// 样片管理页面基类，复用“空间设置”的原生导航栏外观与返回行为。
+class SampleBaseViewController: BaseViewController {
+    override func setupNavigationBar() {
+        navigationItem.backButtonDisplayMode = .minimal
+    }
+
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        navigationController?.setNavigationBarHidden(false, animated: animated)
+        ProfileNavigationStyle.apply(to: navigationController, showsDivider: false)
+    }
+
+    override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+        ProfileNavigationStyle.restore(navigationController)
+    }
+
+    /// 设置与“空间设置”一致的原生导航栏标题。
+    func setSampleTitle(_ title: String) {
+        self.title = title
+    }
+}
+
+/// 锚定在输入框下方的 Android 风格下拉菜单，支持滚动加载更多。
+final class SampleAnchoredDropdownView: UIControl, UIScrollViewDelegate {
+    /// 下拉菜单选项。
+    struct Option {
+        let title: String
+        let isSelected: Bool
+        let isLoadMore: Bool
+
+        /// 创建普通或“加载更多”选项。
+        init(title: String, isSelected: Bool = false, isLoadMore: Bool = false) {
+            self.title = title
+            self.isSelected = isSelected
+            self.isLoadMore = isLoadMore
+        }
+    }
+
+    private let cardView = UIView()
+    private let scrollView = UIScrollView()
+    private let stackView = UIStackView()
+    private var onSelect: ((Int) -> Void)?
+    private var onReachedBottom: (() -> Void)?
+    private var didRequestBottom = false
+
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        backgroundColor = .clear
+        cardView.backgroundColor = .white
+        cardView.layer.cornerRadius = 4
+        cardView.layer.shadowColor = UIColor.black.cgColor
+        cardView.layer.shadowOpacity = 0.14
+        cardView.layer.shadowRadius = 8
+        cardView.layer.shadowOffset = CGSize(width: 0, height: 4)
+        scrollView.delegate = self
+        stackView.axis = .vertical
+        addSubview(cardView)
+        cardView.addSubview(scrollView)
+        scrollView.addSubview(stackView)
+        addTarget(self, action: #selector(dismissMenu), for: .touchUpInside)
+        isHidden = true
+    }
+
+    @available(*, unavailable)
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    /// 在锚点下方展示菜单。
+    func show(
+        anchor: UIView,
+        options: [Option],
+        maximumHeight: CGFloat = 200,
+        onReachedBottom: (() -> Void)? = nil,
+        onSelect: @escaping (Int) -> Void
+    ) {
+        guard !options.isEmpty else { return }
+        self.onSelect = onSelect
+        self.onReachedBottom = onReachedBottom
+        didRequestBottom = false
+        stackView.arrangedSubviews.forEach { $0.removeFromSuperview() }
+
+        for (index, option) in options.enumerated() {
+            let button = UIButton(type: .system)
+            button.tag = index
+            button.contentHorizontalAlignment = .leading
+            button.contentEdgeInsets = UIEdgeInsets(top: 0, left: 12, bottom: 0, right: 12)
+            button.setTitle(option.title, for: .normal)
+            let color = option.isSelected ? AppColor.primary : (option.isLoadMore ? AppColor.textSecondary : .black)
+            button.setTitleColor(color, for: .normal)
+            button.titleLabel?.font = .systemFont(ofSize: 14, weight: option.isSelected ? .medium : .regular)
+            button.backgroundColor = .white
+            button.accessibilityLabel = option.title
+            button.addTarget(self, action: #selector(optionTapped(_:)), for: .touchUpInside)
+            button.snp.makeConstraints { make in make.height.equalTo(28) }
+            stackView.addArrangedSubview(button)
+        }
+
+        isHidden = false
+        superview?.bringSubviewToFront(self)
+        layoutIfNeeded()
+        let anchorFrame = anchor.convert(anchor.bounds, to: self)
+        let contentHeight = CGFloat(options.count) * 28
+        let menuHeight = min(maximumHeight, contentHeight)
+        cardView.frame = CGRect(x: anchorFrame.minX, y: anchorFrame.maxY, width: anchorFrame.width, height: menuHeight)
+        scrollView.frame = cardView.bounds
+        stackView.frame = CGRect(x: 0, y: 0, width: cardView.bounds.width, height: contentHeight)
+        scrollView.contentSize = stackView.frame.size
+    }
+
+    /// 隐藏菜单。
+    func hide() {
+        isHidden = true
+    }
+
+    func scrollViewDidScroll(_ scrollView: UIScrollView) {
+        guard !didRequestBottom, scrollView.contentSize.height > scrollView.bounds.height else { return }
+        let remaining = scrollView.contentSize.height - scrollView.contentOffset.y - scrollView.bounds.height
+        guard remaining <= 10 else { return }
+        didRequestBottom = true
+        onReachedBottom?()
+    }
+
+    @objc private func optionTapped(_ sender: UIButton) {
+        isHidden = true
+        onSelect?(sender.tag)
+    }
+
+    @objc private func dismissMenu() {
+        isHidden = true
+    }
+}