feat: default language Swedish, modern mobile navigation menu, mobile optimizations & translations, shorten mobile hero banner to 4s

- Set 'sv' as default in LanguageProvider + layout (users can switch to 'en')
- Completely revamped mobile drawer menu: slide animation (framer-motion), icons, active states with high-contrast text, large touch targets, better tap feedback
- Horizontal snap-scrolling category filters on mobile (homepage + /menu) for thumb-friendly UX
- Added active:scale / touch-manipulation + press states across cards, buttons, filters for better mobile tap visibility/feedback
- Updated translations for menu page, locations, footer, experience (Swedish-first)
- Made locations + footer language-aware
- Trimmed banner_mobile.mp4 (raw + re-optimized) from 6s to 4s for faster load on mobile
- Reordered languages so Svenska appears first in switcher
- .gitignore already protects developer_instructions.txt (previous commit)

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