Improve chat navigation, model selection, and streaming

components/ai-elements/conversation.tsx

@@ -2,7 +2,7 @@
 
 import { Button } from "@/components/ui/button";
 import { cn } from "@/lib/utils";
-import { ArrowDownIcon } from "lucide-react";
+import { RiArrowDownLine } from "@remixicon/react";
 import type { ComponentProps } from "react";
 import { useCallback } from "react";
 import { StickToBottom, useStickToBottomContext } from "use-stick-to-bottom";
@@ -93,7 +93,7 @@ export const ConversationScrollButton = ({
         variant="outline"
         {...props}
       >
-        <ArrowDownIcon className="size-4" />
+        <RiArrowDownLine className="size-4" />
       </Button>
     )
   );