Fix icons, external file rename

CHDataManagement/Model/FileResource.swift

@@ -116,6 +116,23 @@ final class FileResource: Item {
         default: return content.settings.paths.filesOutputFolderPath
         }
     }
+
+    // MARK: File
+
+    func update(id newId: String) -> Bool {
+        guard !isExternallyStored else {
+            id = newId
+            return true
+        }
+        do {
+            try content.storage.move(file: id, to: newId)
+            id = newId
+            return true
+        } catch {
+            print("Failed to move file \(id) to \(newId)")
+            return false
+        }
+    }
 }
 
 extension FileResource: Identifiable {