FE-1131: petrinaut use text area

[alex-e-leon]

🌟 What is the purpose of this PR?

Adds TextArea to petrinaut.

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

• does not modify any publishable blocks or libraries, or modifications do not need publishing

📜 Does this require a change to the docs?

The changes in this PR:

• are internal and do not require a docs change

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Project	Deployment	Actions	Updated (UTC)
hash	Ready	Preview, Comment	Jul 3, 2026 1:28pm
hashdotdesign-tokens	Ready	Preview, Comment	Jul 3, 2026 1:28pm
petrinaut	Ready	Preview, Comment	Jul 3, 2026 1:28pm

[cursor]

PR Summary

Low Risk
UI-only form and component styling changes with no auth, data, or API impact; TextArea default resize and className placement may slightly affect other consumers.

Overview
Petrinaut metric and scenario description fields now use the design-system TextArea instead of locally styled native <textarea> elements, with shared sm sizing and an 80px minimum height. Duplicate textarea styles are removed, and the metric name field’s TextInput is aligned to sm.

TextArea in ds-components gets small layout fixes: a calculated minHeight on the root, tighter subtle overlay anchoring (no extra pixel offsets), transparent subtle root background, and several token overrides moved to wrapper for disabled/subtle sizing. className applies to the inner box (root) rather than the outer wrapper; the default resize prop is vertical instead of both.

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[kube]

LGTM
Always cool to see in-component CSS classes disappear.