fix: Always show chart tab scroll buttons when needed

[bprusinowski]

Closes #1776

This PR makes sure we always show scroll arrows when needed to avoid empty spaces.

How to test

1. Go to this link.
2. ✅ See that the left arrow is visible without having to scroll.

---

• I added a CHANGELOG entry
• I made a self-review of my own code

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Name	Status	Preview	Comments	Updated (UTC)
visualization-tool	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 23, 2025 9:59am

[bprusinowski]

@sosiology let me know if this solution works for you :)

[sosiology]

@bprusinowski this LGTM thanks! I think we should create a new issue for the 2nd point (the long tab titles). This is not something i think we need to solve now, but maybe in future across the whole application (text blocks, titles, descriptions), seeing as we now also introduced a character limit for the annotations.
example chart: https://visualization-tool-git-feat-always-show-scroll-butt-ad5f82-ixt1.vercel.app/en/v/cOblylIPvXmw?dataSource=Prod

This would also solve issues like this in the user profile:

(this is a chart with a really long title: https://test.visualize.admin.ch/en/v/cnfOO8buWlVY?dataSource=Prod

[sosiology]

This would also solve issues like this in the user profile:

(this is a chart with a really long title: https://test.visualize.admin.ch/en/v/cnfOO8buWlVY?dataSource=Prod

But i now see you already solved this issue here: #2400 🏃

[bprusinowski]

Thanks @sosiology! Yes, I agree – this would be quite easy to enforce once we merge annotations PR 👍