[WIP] Add example functionality for icons overview

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Provide further functionality on icon overview</issue_title>
<issue_description>Es wäre hilfreich, wenn unter /icons/overview für ein ausgewähltes Icon ein Beispiel pro Icon und Voreinstellung (Icon weight & variant) angezeigt wird wie dies zu implementieren ist. Dies kann z. B. in einem popover statt finden.

@mfranzke Ja so in etwa hätte ich mir das vorgestellt. Direkt auch mit Button der einem das Snippet in die Zwischenablage kopiert.

Originally posted by @nfellinger in #3961</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Provide further functionality on icon overview #5376

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[mfranzke]

in favour of #5466