[#5] Add results leaderboard tab

- 6th tab (🏆 Results) shows ranked results across all categories
- Medal icons 🥇🥈🥉 for top 3 per category
- Percentage bars with category colors
- Accessible without voter name via ?view=results URL
- Shareable link: no modal, shows live results

server.js

@@ -49,7 +49,8 @@ function buildSeedData() {
       { id: 'golf',      name: 'Golf',         emoji: '⛳' },
       { id: 'nightlife', name: 'Nightlife',    emoji: '🎧' },
       { id: 'excursion', name: 'Excursions',  emoji: '🚤' },
-      { id: 'itinerary', name: 'Full Itineraries', emoji: '🗺️' },
+      { id: 'itinerary', name: 'Itineraries', emoji: '🗺️' },
+      { id: 'results',   name: 'Results',     emoji: '🏆' },
     ],
     options: [
       // Hotels