Use sticky headers

GitHub PRs:

Heading stays on top:

<img width="1046" height="570" alt="Image" src="https://github.com/user-attachments/assets/5510b79f-c5a6-4ca3-aa22-37891bde687a" />

Would be nice if this would also be supported by RefactoringMiner

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Triggered by https://github.com/JabRef/jabref/pull/14252