design-system chore(styles): remove unused placeholder + cleanup

📄 Description

I noticed the %btn-transparent-background was never used so I removed it and cleaned up the other placeholder files to remove unnecessary imports.

🚀 Demo

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📝 Checklist

✅ My code follows the style guidelines of this project
🛠️ I have performed a self-review of my own code
📄 I have made corresponding changes to the documentation
⚠️ My changes generate no new warnings or errors
🧪 I have added tests that prove my fix is effective or that my feature works
✔️ New and existing unit tests pass locally with my changes

May 05 '25 13:05 leagrdv

⚠️ No Changeset found

Latest commit: eff220a99d6d2e19102c5c5f2d4968a73a986a1a

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May 05 '25 13:05 changeset-bot[bot]

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May 05 '25 13:05 vercel[bot]

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May 05 '25 13:05 swisspost-bot

In general, I'm fine with the update, but...

We never documented this placeholder, which means it's interal code that should not be in use by any project. Therefore, removing it, because it's not used anymore, would not be a changeset worthy update, imo.

If I'm right, we would not need to add a changeset and we would also not need to document it in the migration guide as a breaking change.

If I'm wrong, it should be major instead of minor.

Please double check with @gfellerph or @alizedebray

I don’t have a strong opinion because it's probably not used at all, but I would consider it a major change since something was removed. It will be grouped with other major changes in v10 anyway. Also, since it was never documented, it doesn't need to be mentioned in the migration guide.