fix:二维码修改

src/App.css

@@ -3154,8 +3154,15 @@ body.stage-mode {
   }
 
   .site:not(.is-stage) .qr-card img {
-    width: min(70vw, 14rem) !important;
-    height: min(70vw, 14rem) !important;
+    width: min(70vw, 14.5rem) !important;
+    height: min(70vw, 14.5rem) !important;
+    max-width: none !important;
+    max-height: none !important;
+    padding: 0.65rem !important;
+    border-radius: 0.75rem;
+    background: #fff;
+    box-sizing: border-box;
+    object-fit: contain !important;
   }
 
   .site:not(.is-stage) .footer.in-section {

src/App.tsx

@@ -600,12 +600,12 @@ function App() {
               </div>
               <div className="stage-qr-grid">
                 <div>
-                  <img src="/assets/qr-host.svg" alt="主持人控场二维码占位" />
-                  <span>控场码 · 需配对</span>
+                  <img src="/assets/qr-host.png" alt="控场码：打开展控模式" />
+                  <span>控场码 · 展控模式</span>
                 </div>
                 <div>
-                  <img src="/assets/qr-audience.svg" alt="观众伴读二维码占位" />
-                  <span>观展码 · 同步摘要</span>
+                  <img src="/assets/qr-audience.png" alt="观展码：打开官网首页" />
+                  <span>观展码 · 官网伴读</span>
                 </div>
               </div>
               <div className="stage-keys">键盘 ← 上一节 · → 下一节 · 空格下一节 · Home / End</div>