Allow videos in posts, simplify post image view

CHDataManagement/Model/Loading/LoadingContext.swift

@@ -79,6 +79,17 @@ final class LoadingContext {
         return nil
     }
 
+    func postMedia(_ imageId: String) -> FileResource? {
+        guard let image = file(imageId) else {
+            return nil
+        }
+        if image.type.isImage || image.type.isVideo {
+            return image
+        }
+        error("Post Media \(imageId) is not an image or video")
+        return nil
+    }
+
     func item(itemId: ItemId) -> Item? {
         switch itemId.type {
         case .post:

CHDataManagement/Model/LocalizedPost.swift

@@ -53,6 +53,16 @@ final class LocalizedPost: ObservableObject {
         }
         linkPreview.remove(file)
     }
+
+    // MARK: Images
+
+    var hasImages: Bool {
+        images.contains { $0.type.isImage }
+    }
+
+    var hasVideos: Bool {
+        images.contains { $0.type.isVideo }
+    }
 }
 
 // MARK: Storage
@@ -65,7 +75,7 @@ extension LocalizedPost {
             title: data.title,
             text: data.text,
             lastModified: data.lastModifiedDate,
-            images: data.images.compactMap(context.image),
+            images: data.images.compactMap(context.postMedia),
             pageLinkText: data.pageLinkText,
             linkPreview: .init(context: context, data: data.linkPreview))
     }