Fix: Radio search results empty + texture quality

- Search API: read title/subtitle/url from _source.page (nested)
- Channel click: extract correct ID from URL (last segment)
- Replace earth texture with higher-res 4096x2048 original

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/plugins/radio/RadioTab.tsx

@@ -332,7 +332,7 @@ export default function RadioTab({ data }: { data: any }) {
     setSearchResults([]);
 
     if (hit.type === 'channel') {
-      const channelId = hit.url.match(/\/listen\/([^/]+)/)?.[1];
+      const channelId = hit.url.match(/\/listen\/[^/]+\/([^/]+)/)?.[1];
       if (channelId) {
         handlePlay(channelId, hit.title, hit.subtitle, '');
       }