Scrolling text: vertical direction option (up / down) in addition to horizontal

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/control.html

@@ -252,6 +252,12 @@
             <option value="middle">Centro</option>
           </select>
         </div>
+        <label>Direzione</label>
+        <select id="ticker-dir">
+          <option value="h">➡️ Orizzontale</option>
+          <option value="vup">⬆️ Verticale (su)</option>
+          <option value="vdown">⬇️ Verticale (giù)</option>
+        </select>
         <label>Velocità testo <span id="ticker-speed-val">1.0×</span></label>
         <input type="range" id="ticker-speed" min="0.2" max="4" step="0.1" value="1" />
         <label>Carattere</label>