feat: redesign travel album management

suixinkan/Features/TravelAlbum/Models/TravelAlbumModels.swift

@@ -277,4 +277,22 @@ enum TravelAlbumDisplayFormatter {
         }
         return text
     }
+
+    /// 将服务端创建时间格式化为摘要卡使用的 `yyyy/MM/dd HH:mm`。
+    static func creationTimeText(_ text: String) -> String {
+        guard !text.isEmpty else { return "--" }
+        let normalized = text.replacingOccurrences(of: "T", with: " ")
+        guard normalized.count >= 16 else { return normalized }
+        return String(normalized.prefix(16)).replacingOccurrences(of: "-", with: "/")
+    }
+
+    /// 计算相册摘要卡封面，按相册、素材缩略图、素材原图顺序回退。
+    static func albumCoverURL(album: TravelAlbum?, materials: [TravelAlbumMaterial]) -> String {
+        if let coverURL = album?.coverUrl.trimmingCharacters(in: .whitespacesAndNewlines), !coverURL.isEmpty {
+            return coverURL
+        }
+        guard let first = materials.first else { return "" }
+        let materialCover = first.coverUrl.trimmingCharacters(in: .whitespacesAndNewlines)
+        return materialCover.isEmpty ? first.fileUrl.trimmingCharacters(in: .whitespacesAndNewlines) : materialCover
+    }
 }

suixinkan/Features/TravelAlbum/ViewModels/TravelAlbumDetailViewModel.swift

@@ -27,11 +27,21 @@ final class TravelAlbumDetailViewModel {
             case .fileNameDesc: "文件名倒序"
             }
         }
+
+        var compactTitle: String {
+            switch self {
+            case .createdAsc: "时间 ↑"
+            case .createdDesc: "时间 ↓"
+            case .fileNameAsc: "名称 ↑"
+            case .fileNameDesc: "名称 ↓"
+            }
+        }
     }
 
     private(set) var album: TravelAlbum?
     private(set) var materials: [TravelAlbumMaterial] = []
     private(set) var allPhotoCount = 0
+    private(set) var purchasedPhotoCount = 0
     private(set) var selectedTab: Tab = .all
     private(set) var sortOption: SortOption = .createdDesc
     private(set) var isLoading = true
@@ -65,6 +75,7 @@ final class TravelAlbumDetailViewModel {
         notifyStateChange()
         await loadAlbumInfo(api: api)
         await loadAllPhotoCount(api: api)
+        await loadPurchasedPhotoCount(api: api)
         await loadMaterials(reset: true, api: api)
         isRefreshing = false
         isLoading = false
@@ -102,6 +113,30 @@ final class TravelAlbumDetailViewModel {
         }
     }
 
+    /// 拉取已购照片数量；失败时保留已有数量，不影响素材列表加载。
+    func loadPurchasedPhotoCount(api: any TravelAlbumServing) async {
+        do {
+            let response = try await api.materialList(
+                userEquityTravelId: albumId,
+                page: 1,
+                pageSize: 1,
+                orderBy: sortOption.rawValue,
+                isPurchased: 1
+            )
+            purchasedPhotoCount = response.total
+            notifyStateChange()
+        } catch is CancellationError {
+            return
+        } catch {
+            return
+        }
+    }
+
+    /// 摘要卡封面地址，依次回退相册封面、首张素材封面和首张素材原图。
+    var displayCoverURL: String {
+        TravelAlbumDisplayFormatter.albumCoverURL(album: album, materials: materials)
+    }
+
     /// 切换素材 tab。
     func selectTab(_ tab: Tab, api: any TravelAlbumServing) async {
         guard selectedTab != tab else { return }
@@ -144,6 +179,8 @@ final class TravelAlbumDetailViewModel {
             canLoadMore = materials.count < response.total
             if selectedTab == .all {
                 allPhotoCount = response.total
+            } else {
+                purchasedPhotoCount = response.total
             }
             isLoadingMore = false
             notifyStateChange()