Cap fullscreen detail at 1920px width for ultrawide side margins.

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

control/frontend/src/styles.css

@@ -451,14 +451,16 @@ td {
   transform: translateX(20px);
 }
 
-/* 点击卡片后铺满视口（含带鱼屏） */
+/* 全屏：≤1920 铺满；带鱼屏内容限宽 1920，两侧留空 */
 .modal-backdrop {
   position: fixed;
   inset: 0;
   width: 100vw;
   height: 100dvh;
   background: var(--bg, #04080e);
-  display: block;
+  display: flex;
+  justify-content: center;
+  align-items: stretch;
   padding: 0;
   margin: 0;
   z-index: 50;
@@ -468,8 +470,8 @@ td {
 
 .modal-panel {
   width: 100%;
+  max-width: 1920px;
   height: 100%;
-  max-width: none;
   max-height: none;
   overflow: auto;
   background: var(--panel);
@@ -480,6 +482,7 @@ td {
   flex-direction: column;
   gap: 14px;
   box-sizing: border-box;
+  flex-shrink: 0;
 }
 
 .modal-panel.running {