Scrolling text: 'side edges' mode with characters stacked vertically on both borders

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

src/output.html

@@ -29,6 +29,12 @@
   <!-- Scrolling text ticker -->
   <div id="ticker"><div id="ticker-track"><span class="tick-copy"></span><span class="tick-copy"></span></div></div>
 
+  <!-- Side text: vertical stacked characters scrolling on both edges -->
+  <div id="side-text">
+    <div class="side-col left"><div class="side-track"><span class="side-copy"></span><span class="side-copy"></span></div></div>
+    <div class="side-col right"><div class="side-track"><span class="side-copy"></span><span class="side-copy"></span></div></div>
+  </div>
+
   <div id="drop-hint">
     <div class="big">🎛 In attesa dell'audio…</div>
     <div class="small">Usa il pannello di controllo sull'altro schermo</div>