FIX: more specific name for rewind blink animation (#37576)

this was leaking into another animation and causing interesting results
😆

<img width="350" alt="image"
src="https://github.com/user-attachments/assets/a4738717-37c2-4f9f-b0dc-d8937d00037e"
/>

plugins/discourse-rewind/assets/stylesheets/common/invites.scss

@@ -181,7 +181,7 @@
       background: #ff9;
 
       @media (prefers-reduced-motion: no-preference) {
-        animation: blink 0.5s infinite;
+        animation: rewind-invites-blink 0.5s infinite;
       }
     }
 
@@ -191,7 +191,7 @@
     }
   }
 
-  @keyframes blink {
+  @keyframes rewind-invites-blink {
     0%,
     100% {
       background: #ff0;