build: update dependency @commonground/design-system to v21.1.6 - autoclosed

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@commonground/design-system	21.1.5 -> 21.1.6

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Configuration

📅 Schedule: Branch creation - "after 10pm every weekday,before 5am every weekday,every weekend" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled due to failing status checks.

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🔕 Ignore: Close this MR and you won't be reminded about this update again.

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