Fix real Biome bugs: inner declarations, dup keys, assign-in-expr, implicit any, cookie, a11y svg/keyboard, json

src/components/language-switcher.tsx

@@ -5,6 +5,7 @@ import Image from "next/image";
 import { useRouter } from "next/navigation";
 import { useLocale } from "next-intl";
 import { useEffect, useMemo, useRef, useState, useTransition } from "react";
+import { setLocaleCookie } from "@/actions/set-locale";
 
 const LOCALES: { code: string; label: string; lang: string }[] = [
 	{ code: "nl", label: "Nederlands", lang: "nl" },
@@ -66,8 +67,10 @@ export function LanguageSwitcher() {
 
 	function switchLocale(code: string) {
 		if (code === locale) return;
-		document.cookie = `NEXT_LOCALE=${code};path=/;max-age=31536000;samesite=strict;secure`;
-		startTransition(() => router.refresh());
+		startTransition(async () => {
+			await setLocaleCookie(code);
+			router.refresh();
+		});
 		setOpen(false);
 	}