chore: apply oxlint fix-suggestions (unused imports + useless fragments)

Scoped to only `no-unused-vars` and `react/jsx-no-useless-fragment` —
the safe subset of --fix-suggestions. Primary changes:

- Remove unused named imports from statements
- Remove unused default/type imports entirely
- Collapse `<><Single/></>` fragments to `<Single/>`

Verified clean: typecheck + format + lint all green.

packages/website/src/components/landing-page.tsx

@@ -1,12 +1,5 @@
 import * as React from "react";
-import {
-  motion,
-  AnimatePresence,
-  useInView,
-  useScroll,
-  useTransform,
-  useMotionValueEvent,
-} from "framer-motion";
+import { motion, AnimatePresence, useInView, useScroll, useTransform } from "framer-motion";
 import { CursorFieldProvider } from "~/components/butterfly";
 import { CommandDialog } from "~/components/command-dialog";
 import {