refactor: remove electron-related code

src/components/ScrollToTopButton/index.tsx

@@ -0,0 +1,30 @@
+import { Button } from '@/components/ui/button'
+import { cn } from '@/lib/utils'
+import { ChevronUp } from 'lucide-react'
+
+export default function ScrollToTopButton({
+  scrollAreaRef,
+  className,
+  visible = true
+}: {
+  scrollAreaRef: React.RefObject<HTMLDivElement>
+  className?: string
+  visible?: boolean
+}) {
+  const handleScrollToTop = () => {
+    scrollAreaRef.current?.scrollTo({ top: 0, behavior: 'smooth' })
+  }
+
+  return (
+    <Button
+      variant="secondary-2"
+      className={cn(
+        `absolute bottom-2 right-2 rounded-full w-11 h-11 p-0 hover:text-background transition-transform ${visible ? '' : 'translate-y-14'}`,
+        className
+      )}
+      onClick={handleScrollToTop}
+    >
+      <ChevronUp />
+    </Button>
+  )
+}