Generate video thumbnails

CHDataManagement/Model/Content.swift

@@ -165,6 +165,21 @@ final class Content: ObservableObject {
                 self.tagOverview = result.tagOverview
                 self.didLoadContent = true
                 callback([])
+                self.generateMissingVideoThumbnails()
+            }
+        }
+    }
+
+    func generateMissingVideoThumbnails() {
+        Task {
+            for file in self.files {
+                guard file.type.isVideo else { continue }
+                guard !file.isExternallyStored else { continue }
+                guard !storage.hasVideoThumbnail(for: file.id) else { continue }
+                if await imageGenerator.createVideoThumbnail(for: file.id) {
+                    print("Generated thumbnail for \(file.id)")
+                    file.didChange()
+                }
             }
         }
     }