fix(configurator): replace overflow:hidden with overflow:clip

[jackgranatowski]

This pull request was created by @kiro-agent on behalf of @jackgranatowski 👻

Comment with /kiro fix to address specific feedback or /kiro all to address everything.
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Summary

overflow: hidden on .group (TokenGroup), .panel__card (DomainPanel), and .knobs (QuickKnobs) was causing token rows and subcategory content to be clipped and invisible across all domain tabs (Spacing, Typography, Colors, etc.).

Changes

• TokenGroup.svelte — .group: overflow: hidden → overflow: clip
• DomainPanel.svelte — .panel__card: overflow: hidden → overflow: clip
• QuickKnobs.svelte — .knobs: overflow: hidden → overflow: clip

Why overflow: clip instead of removing it?

overflow: clip still clips rendering at the border-radius boundary (preventing child backgrounds from bleeding outside rounded corners), but unlike hidden it does not create a new scroll container or affect intrinsic/extrinsic sizing calculations. This means child content is no longer collapsed to zero height when the container doesn't have an explicit height.

Testing

• All 272 existing unit tests pass
• Visually verified the Spacing panel's token groups are now fully visible

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: ce04967e-fbf1-4c58-a96d-fd188094c367

📥 Commits

Reviewing files that changed from the base of the PR and between e532dfd and 6950ef6.

📒 Files selected for processing (3)

• configurator/src/components/DomainPanel.svelte
• configurator/src/components/QuickKnobs.svelte
• configurator/src/components/TokenGroup.svelte

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/overflow-clip-panels

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