全能创作：定妆/台词/换款与剧情方向硬约束，资源可下载

修角色定妆修改不重出图、角色图混入商品、宠物旁白腔、换款同点复读、剧情反转方向漂移，并补会话资源下载与外观/空消息闸门。

core/frontend/src/design-restraint.css

@@ -2025,9 +2025,16 @@ select.duration-select:focus,
   border-radius: var(--r-md);
   box-shadow: 0 20px 60px rgba(0, 0, 0, .5);
 }
-.np-lightbox .lb-x {
+.np-lightbox .lb-actions {
   position: fixed;
   top: 24px; right: 24px;
+  z-index: 1;
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+.np-lightbox .lb-x,
+.np-lightbox .lb-dl {
   width: 44px; height: 44px;
   border-radius: 50%;
   background: rgba(255, 255, 255, .12);
@@ -2038,8 +2045,10 @@ select.duration-select:focus,
   place-items: center;
   transition: background var(--t-base);
 }
-.np-lightbox .lb-x:hover { background: rgba(255, 255, 255, .24); }
-.np-lightbox .lb-x svg { width: 18px; height: 18px; }
+.np-lightbox .lb-x:hover,
+.np-lightbox .lb-dl:hover { background: rgba(255, 255, 255, .24); }
+.np-lightbox .lb-x svg,
+.np-lightbox .lb-dl svg { width: 18px; height: 18px; }
 .np-lightbox .lb-name {
   position: fixed;
   bottom: 24px; left: 50%;