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fix: 🐛 preserve breakpoints.keys in the validated theme (#2272)

withBreakpointValidation replaced theme.breakpoints wholesale with an
object built only from the validator names (up, down, between, only),
so `keys` was dropped from the public API. The spread of `...theme` did
not help, since `breakpoints` is the only top-level key.

Consumers of the public entry point got `undefined` for
`theme.breakpoints.keys` while ThemeBreakpoints still typed it as
`readonly string[]`, so TypeScript accepted code that crashed at runtime.

Existing tests missed this because they cover create-theme (the raw
module) and with-validation (against a mock) separately, never the
composition that ships. Add a spec on the public entry point.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

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