chore(fuselage)!: Remove useArrayLikeClassNameProp and Falsy from the public API

[tassoevan]

Proposed changes

Removes useArrayLikeClassNameProp and the Falsy type from the @rocket.chat/fuselage public entry point. Both are internal helpers, used only by Box and StylingBox; the modules themselves are untouched and keep working internally.

Follow-up to #2167.

Note

The API report now carries an api-extractor warning:

src/components/Box/Box.tsx:32:5 - (ae-forgotten-export) The symbol "Falsy" needs to be exported by the entry point index.d.ts

Falsy is still referenced by Box's public className prop type, so un-exporting it leaves a dangling reference in the generated declarations. If that warning shouldn't stand, the alternatives are inlining the union in Box's prop type or keeping Falsy exported.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change): two previously public exports are gone.

Checklist

• I have read the CONTRIBUTING doc
• Lint and unit tests pass locally with my changes

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