Fix preview.html to native 320x240 without internal scale.

Card host now scales the iframe; remove broken transform that clipped UI to the corner.

Co-authored-by: Cursor <cursoragent@cursor.com>

firmware/cyd/media/preview.html

@@ -5,10 +5,10 @@
 <title>PHOTOS</title>
 <style>
   *{box-sizing:border-box;margin:0;padding:0}
-  html,body{width:100%;height:100%;overflow:hidden;background:#000}
-  .bezel{width:100%;height:100%;display:grid;place-items:center;background:#1a1408}
+  html,body{width:320px;height:240px;overflow:hidden;background:#000;margin:0}
+  .bezel{width:320px;height:240px;background:#1a1408}
   .screen{width:320px;height:240px;background:#0A1016;color:#EAF0F6;font:12px/1.2 system-ui,sans-serif;
-    display:flex;flex-direction:column;overflow:hidden;transform-origin:center;transform:scale(var(--s,1))}
+    display:flex;flex-direction:column;overflow:hidden;}
   .top{height:28px;display:flex;align-items:center;padding:0 10px;gap:10px}
   .top .t{color:#4FC3F7;font-weight:700;font-size:14px}
   .top .i{margin-left:auto;color:#EAF0F6}
@@ -38,10 +38,6 @@
   <div class="hint">tap · SoftSPI touch</div>
   <div class="bot"><button class="btn" type="button">PREV</button><button class="btn next" type="button">NEXT</button></div>
 </div></div>
-<script>
-(function(){function fit(){var s=document.getElementById('s');var r=s.parentElement.getBoundingClientRect();
-s.style.setProperty('--s',Math.min(r.width/320,r.height/240));}
-fit();addEventListener('resize',fit);})();
-</script>
+
 </body>
 </html>