New visitors always got the English default because locale resolution
only ever read the NEXT_LOCALE cookie — never set until a user visits
a page with the LanguageSwitcher, which only lives in the authenticated
app Sidebar. /onboarding/pet runs before that, so a German browser
landed in English with no way to change it (reported live after
deploying the upload-consent step from Gitea #3).
Adds an Accept-Language fallback in src/i18n/request.ts (only consulted
when no cookie is set) and renders the existing LanguageSwitcher on the
onboarding page so users can override the guess.
admin
4d9727f0d1