[alexcarpenter]

Description

Stacked on #9749. A worked example of clearing two grandfathered complexity suppressions, to show what a reduction looks like before deciding how far to push the rule.

Button (25 → 14). The stylex composition moves into a buttonStyleProps function alongside the two derived flags it alone uses. MosaicButton keeps resolving props against ButtonContext and rendering. No behaviour change.

Input (28 → 15). useOptionalFieldControlProps already returns every control attribute with the own prop as fallback, or null outside a Field. The five fieldProps?.x ?? x lookups collapse to one fieldProps ?? ownProps choice, and the two variant style conditionals become a lookup. No behaviour change.

Both stale entries are pruned from packages/ui/eslint-suppressions.json, so this is also the first run of the prune flow described in #9749.

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

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[alexcarpenter]

Closing. The reductions here are mostly metric-chasing: cyclomatic complexity counts every ?? and ?., so prop-merging primitives score high without being hard to read. Evaluating cognitive complexity instead on #9749.