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Fix crash when stored playground language state is invalid (#3646)

* Fix crash when stored playground language state is invalid

Validate the stored chapter+variant combination against ALL_LANGUAGES
when loading from localStorage. Falls back to the default language config
if the combination is invalid (e.g. chapter 1 + explicit-control).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Fall back to defaultLanguageConfig for invalid stored language state

When the stored chapter+variant combination is not in ALL_LANGUAGES,
reset to `defaultLanguageConfig` (a known-valid pair) rather than to the
individual default context fields, so the fallback is explicitly "the
default language config" as the issue describes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Richard Dominick <34370238+RichDom2185@users.noreply.github.com>

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