test: add unit tests for I18nContext defaults and language switching#447
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Looks good: focused I18nContext unit coverage for defaults, translation lookup, locale switching, and provider misuse; checks are green.
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Closes #77
Changes
frontend/src/components/I18nContext.tsxfrontend/testing/unit/components/I18nContext.test.tsxTests added (9 tests)
ensetLocalefunction is exposed in contexttis always a function (regression guard)useTranslationthrows outside providerVerification
npm run test → 207 passed (23 files)
