feat: expand station cards with detailed information and add live statistics endpoint

- Add `/stats/live` endpoint returning station count and latest price timestamp with 5-minute cache
- Transform StationCard into expandable component with click/keyboard interaction showing full details
- Display brand label, badges (24h/Supermarket/Motorway), fuel types, amenities, opening hours, and price delta vs average
- Add brand filter dropdown to StationList with dynamic brand extraction from results
- Calculate and display price comparison against filtered stations average
- Redesign map markers to simpler price display; move directions link to popup alongside station details
- Add "locate-me" button to SearchBar for geolocation trigger
- Show "Live" indicator with station count and last-update time on homepage hero
- Remove standalone directions link from marker HTML; consolidate in popup with click propagation handling
- Persist `avgPence` calculation across StationList and pass to cards for delta display
- Add `@iconify-json/lucide` dev dependency and register collection on app mount
- Stop click propagation on card action buttons (directions, remove)

package.json

@@ -24,5 +24,8 @@
         "@rollup/rollup-linux-x64-gnu": "4.9.5",
         "@tailwindcss/oxide-linux-x64-gnu": "^4.0.1",
         "lightningcss-linux-x64-gnu": "^1.29.1"
+    },
+    "devDependencies": {
+        "@iconify-json/lucide": "^1.2.102"
     }
 }