Replace non-reactive window.location.pathname with SvelteKit's reactive $page store to ensure language selector updates when navigating via browser back/forward buttons.
When switching languages on specific category or tag pages, redirect to
the selection page instead of trying to maintain the same category/tag,
since category and tag names differ between languages. Icon pages continue
to swap directly since icons are consistent across languages.
Extract language switching functionality from UserHeader into a new
LanguageSelector component. In mobile view, the selector appears in
the top bar next to the hamburger menu. In desktop view, it appears
in the navigation bar to the left of the UserHeader.
- Create LanguageSelector component with local element bindings
- Update Header component with language_selector_mobile and
language_selector_desktop slots
- Remove language selector code from UserHeader
- Update recipe and main layouts to use new component
- Hide desktop language selector inside mobile hamburger menu
