chore: Fix broken imports

[mshabarov]

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[github-actions]

AI Language Review

1. InputStreamDownloadView.java:

   • In AttachmentRepository's findById method, the correct return type should be Optional<Attachment> as per Spring Data JPA convention.
   • If findById is intended not to return an Optional, handling of the potential null return should be considered in the download handler code to avoid NullPointerException.

2. UploadFileBuffer.java:

   • The lambda expression for creating a new File in the FileUploadHandler was changed from (fileName -> ...) to (metadata -> ...). Ensure that metadata is appropriately used to retrieve the file name. It seems like metadata.fileName() is being used, which aligns with the change.

3. JavaScript Router Code:

   • In the import statement, the path to the Flow module was changed to use '/Flow' instead of just '/flow-frontend'. Ensure that the new path points to the correct module location.

These points cover necessary areas for improvement. All changes made should be thoroughly tested to ensure expected functionality is not disrupted.