Replace scss with bs class

apps/app/src/features/openai/client/components/AiAssistant/AiAssistantSidebar/AiAssistantSidebar.module.scss

@@ -19,7 +19,6 @@
   }
 
   .thread-title-sticky {
-    background-color: rgba(var(--bs-body-bg-rgb), 0.75);
     -webkit-backdrop-filter: blur(10px);
     backdrop-filter: blur(10px);
   }

apps/app/src/features/openai/client/services/knowledge-assistant.tsx

@@ -243,7 +243,7 @@ export const useKnowledgeAssistant: UseKnowledgeAssistant = () => {
     }
 
     return (
-      <div className="thread-title-sticky position-sticky top-0 py-2 px-3 z-1">
+      <div className="thread-title-sticky sticky-top bg-body bg-opacity-75 py-2 px-3 z-1 ">
         <div className="d-flex align-items-center gap-2">
           <button
             type="button"