Add CYD browser flasher with Next.js, i18n, and Web Serial install.

Replace the starter app with a public/local flasher that discovers sibling firmwares, supports en/zh, and documents HTTPS deploy.

Co-authored-by: Cursor <cursoragent@cursor.com>

components/language-switcher.tsx

@@ -0,0 +1,38 @@
+"use client";
+
+import { useLocale, useTranslations } from "next-intl";
+import { usePathname, useRouter } from "@/i18n/navigation";
+import { routing, type AppLocale } from "@/i18n/routing";
+import { cn } from "@/lib/utils";
+
+export function LanguageSwitcher() {
+  const t = useTranslations("lang");
+  const locale = useLocale() as AppLocale;
+  const router = useRouter();
+  const pathname = usePathname();
+
+  return (
+    <div
+      className="inline-flex items-center gap-1 rounded-lg border border-[var(--line)] p-0.5"
+      role="group"
+      aria-label={t("label")}
+    >
+      {routing.locales.map((loc) => (
+        <button
+          key={loc}
+          type="button"
+          className={cn(
+            "rounded-md px-2.5 py-1 text-xs font-medium transition-colors",
+            loc === locale
+              ? "bg-[rgba(240,197,10,0.18)] text-[var(--accent-hot)]"
+              : "text-[var(--muted)] hover:text-[var(--ink)]"
+          )}
+          aria-pressed={loc === locale}
+          onClick={() => router.replace(pathname, { locale: loc })}
+        >
+          {t(loc)}
+        </button>
+      ))}
+    </div>
+  );
+}