Add compare button to duplicates in Citation relations tab

[AbdAlRahmanGad]

I think it would be nice if we added a compare button to the duplicates in the citation relations tab. The compare button will open the "Possible duplicate entries" window.

It will look something like this:

For more context: The duplication detection in the citation relations tab was implemented in this PR https://github.com/JabRef/jabref/pull/11186

[koppor]

@AbdAlRahmanGad Nice idea! Helps to see if JabRef works right - and also helps to add missing data to JabRef (if available)

[harshithap2000]

@koppor I wish to work on this issue with a teammate for university assignment.

I had a query, I see that gui/entryeditor/citationrelationtab/CitationRelationsTab.java (shown below) has the code for rendering the citation list. Where can I find the UI files for the same? So that I can add a compare button along with the link button.

.map(localEntry -> new CitationRelationItem(entr, localEntry, true)) // duplicate entry
.orElseGet(() -> new CitationRelationItem(entr, false)))
                

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[Siedlerchr]

The UI is direclty construced in CitationRelationsTab getPaneAndStartSearch