♻️ Refactor watchOS content view

ios/WatchRunner Watch App/Views/AttachmentImageView.swift

@@ -0,0 +1,38 @@
+//
+//  AttachmentImageView.swift
+//  WatchRunner Watch App
+//
+//  Created by LittleSheep on 2025/10/29.
+//
+
+import SwiftUI
+
+struct AttachmentImageView: View {
+    let attachment: SnCloudFile
+    @EnvironmentObject var appState: AppState
+    @StateObject private var imageLoader = ImageLoader()
+
+    var body: some View {
+        Group {
+            if imageLoader.isLoading {
+                ProgressView()
+            } else if let image = imageLoader.image {
+                image
+                    .resizable()
+                    .aspectRatio(contentMode: .fit)
+                    .frame(maxWidth: .infinity)
+            } else if let errorMessage = imageLoader.errorMessage {
+                Text("Failed to load attachment: \(errorMessage)")
+                    .font(.caption)
+                    .foregroundColor(.red)
+            } else {
+                Text("File: \(attachment.id)")
+            }
+        }
+        .task(id: attachment.id) {
+            if let serverUrl = appState.serverUrl, let imageUrl = getAttachmentUrl(for: attachment.id, serverUrl: serverUrl), let token = appState.token, attachment.mimeType?.starts(with: "image") == true {
+                await imageLoader.loadImage(from: imageUrl, token: token)
+            }
+        }
+    }
+}