feat: redesign DiscoverView with friendly UX, sections and filter chips
- Friendly header with 'Explora Chiriquí!' greeting and prominent search bar - Horizontal category chips with emojis (Restaurante, Hotel, Cafe, etc.) - Sticky chips row for quick filtering while scrolling - 'Destacados' section: 2 large portrait cards with image, gradient overlay, category badge - 'Por Area' chips: David, Boquete, Volcan, etc. — click to filter - 'Todos los lugares' 2-col grid with image, cat badge, area label - When filtering: results counter, reset button, 'no results' empty state - 'Busca algo mas' CTA card at bottom of filtered results - Full dark/light mode via CSS variables
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