'update'

ipad_app/Sources/Services/ImageCache.swift

@@ -0,0 +1,65 @@
+#if canImport(UIKit)
+import UIKit
+#endif
+import SwiftUI
+
+#if canImport(UIKit)
+typealias PlatformImage = UIImage
+#elseif canImport(AppKit)
+import AppKit
+typealias PlatformImage = NSImage
+#endif
+
+#if canImport(UIKit) || canImport(AppKit)
+actor ImageCache {
+    static let shared = ImageCache()
+    private var cache: [String:PlatformImage] = [:]
+
+    func image(for id: String, in baseDir: URL) -> PlatformImage? {
+        if let c = cache[id] { return c }
+        let url = baseDir.appendingPathComponent("covers/\(id).jpg")
+        #if canImport(UIKit)
+        guard let img = PlatformImage(contentsOfFile: url.path) else { return nil }
+        #elseif canImport(AppKit)
+        guard let img = PlatformImage(contentsOf: url) else { return nil }
+        #endif
+        cache[id] = img
+        return img
+    }
+}
+#endif
+
+#if os(iOS)
+struct CoverImageView: View {
+    let book: BookMeta
+    let bundleDir: URL
+    #if canImport(UIKit) || canImport(AppKit)
+    @State private var uiImage: PlatformImage? = nil
+    #endif
+
+    var body: some View {
+        ZStack {
+            #if canImport(UIKit) || canImport(AppKit)
+            if let img = uiImage {
+                #if canImport(UIKit)
+                Image(uiImage: img).resizable().scaledToFit().cornerRadius(6)
+                #elseif canImport(AppKit)
+                Image(nsImage: img).resizable().scaledToFit().cornerRadius(6)
+                #endif
+            } else {
+                Rectangle().fill(Color.gray.opacity(0.2)).overlay(Text("No Cover").font(.caption))
+            }
+            #else
+            Rectangle().fill(Color.gray.opacity(0.2)).overlay(Text("No Cover").font(.caption))
+            #endif
+        }
+        #if canImport(UIKit) || canImport(AppKit)
+        .task {
+            if uiImage == nil, let img = await ImageCache.shared.image(for: book.id, in: bundleDir) {
+                uiImage = img
+            }
+        }
+        #endif
+    }
+}
+#endif