fix(desktop): stop pet idle animation flicker

Author: yiliang114

packages/desktop-shell/bootstrap/pet.html

@@ -24,34 +24,31 @@
         width: 144px;
         height: 156px;
         background: url('./qwen-pet.webp') 0 0 / 1152px 1404px no-repeat;
-        animation: idle 1.1s steps(1) infinite;
+        animation: idle 6.6s step-end infinite;
         image-rendering: pixelated;
         filter: drop-shadow(0 9px 8px rgb(0 0 0 / 35%));
       }
       @keyframes idle {
         0% {
           background-position: 0 0;
         }
-        12.5% {
+        25.4545% {
           background-position: -144px 0;
         }
-        25% {
+        35.4545% {
           background-position: -288px 0;
         }
-        37.5% {
+        45.4545% {
           background-position: -432px 0;
         }
-        50% {
+        58.1818% {
           background-position: -576px 0;
         }
-        62.5% {
+        70.9091% {
           background-position: -720px 0;
         }
-        75% {
-          background-position: -864px 0;
-        }
-        87.5% {
-          background-position: -1008px 0;
+        100% {
+          background-position: 0 0;
         }
       }
       @media (prefers-reduced-motion: reduce) {