修复桌面端界面显示与稳定性问题

frontend/src/components/WebLayout.vue

@@ -2,7 +2,7 @@
   <el-container class="layout-container web-layout-container">
     <el-aside :width="isCollapsed ? '68px' : '200px'" class="layout-aside" :class="{ collapsed: isCollapsed }">
       <div class="aside-logo">
-        <div class="logo-icon"></div>
+        <img class="logo-icon" src="/icons/ctms-icon-192.png" alt="" aria-hidden="true" />
         <span class="logo-text">{{ TEXT.common.appName }}</span>
       </div>
       <el-menu
@@ -1309,6 +1309,7 @@ useDesktopShortcuts(
   border-radius: 8px;
   margin-right: 12px;
   box-shadow: 0 8px 18px rgba(15, 23, 42, 0.26);
+  object-fit: contain;
 }
 
 .logo-text {