fix: separate wave animation keyframes for better compatibility

Co-authored-by: aider (deepseek/deepseek-chat) <aider@aider.chat>

Author: coding-hui

website/src/pages/index.module.css

@@ -38,9 +38,10 @@
 }
 
 @keyframes wave {
-  0%, 100% { transform: rotate(0deg); }
+  0% { transform: rotate(0deg); }
   25% { transform: rotate(10deg); }
   75% { transform: rotate(-10deg); }
+  100% { transform: rotate(0deg); }
 }
 
 .heroTitle {