feat(ux): show relations in side menu

[eric-intuitem]

This PR shows related objects with a side menu, which makes it possible to show lots of relations.
This is illustrated with domains, where almost all objects are now visible.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch repalace_tabs

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