polish: improve game card aesthetics

- larger scores (1.6rem), logos (40px), and card width (290px)
- green top border accent on live game cards
- section headings reduced to small muted caps
- more breathing room in team rows
- slightly larger card radius and gap

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

app/static/script.js

@@ -49,7 +49,7 @@ function renderLiveGame(game) {
         </div>` : '';
 
     return `
-        <div class="game-box">
+        <div class="game-box game-box-live">
             <div class="card-header">
                 <div class="badges">
                     ${periodLabel}