fix: add scrolling including scroll shadow

[Flo0806]

Fixes: #598

---

Add scrolling to sidebar if needed with softly scroll shadow effect.

Bildschirmaufnahme.2026-02-03.091711.mp4

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Project	Deployment	Actions	Updated (UTC)
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[RYGRIT]

Should i18n be included as well?

[github-actions]

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[wojtekmaj]

@Flo0806 While you address the comments, please make sure to rebase the PR so that the latest changes to CI pipeline could be applied, making your PR mergable again. Thanks!

[wojtekmaj]

Duplicate of #805?

[Flo0806]

Yeah, it's a duplicate #805 is also not linked and I overlooked it.