feat: Implement Algolia DocSearch, enhance MDX components, and update build configurations.

components/mob-toc.tsx

@@ -7,14 +7,14 @@ import { useRef, useMemo } from "react";
 import { usePathname } from "next/navigation";
 import { Button } from "./ui/button";
 import { motion, AnimatePresence } from "framer-motion";
-import { useScrollPosition, useActiveSection } from "@/hooks";
+import { useActiveSection } from "@/hooks";
 import { TocItem } from "@/lib/toc";
 
 interface MobTocProps {
   tocs: TocItem[];
 }
 
-const useClickOutside = (ref: React.RefObject<HTMLElement>, callback: () => void) => {
+const useClickOutside = (ref: React.RefObject<HTMLElement | null>, callback: () => void) => {
   const handleClick = React.useCallback((event: MouseEvent) => {
     if (ref.current && !ref.current.contains(event.target as Node)) {
       callback();