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/ui/badge.tsx

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+import * as React from "react";
+import { cva, type VariantProps } from "class-variance-authority";
+import { cn } from "@/lib/utils";
+
+const badgeVariants = cva(
+  "inline-flex items-center rounded-md px-2 py-0.5 text-xs font-medium",
+  {
+    variants: {
+      variant: {
+        default: "bg-[rgba(240,197,10,0.12)] text-[var(--accent-hot)]",
+        muted: "bg-[rgba(0,0,0,0.25)] text-[var(--muted)]",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+    },
+  }
+);
+
+export function Badge({
+  className,
+  variant,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement> & VariantProps<typeof badgeVariants>) {
+  return <div className={cn(badgeVariants({ variant }), className)} {...props} />;
+}

components/ui/button.tsx

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+import * as React from "react";
+import { Slot } from "@radix-ui/react-slot";
+import { cva, type VariantProps } from "class-variance-authority";
+import { cn } from "@/lib/utils";
+
+const buttonVariants = cva(
+  "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-full text-sm font-semibold transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[var(--accent)] focus-visible:ring-offset-2 focus-visible:ring-offset-[var(--bg)] disabled:pointer-events-none disabled:opacity-45",
+  {
+    variants: {
+      variant: {
+        default:
+          "bg-[linear-gradient(180deg,var(--accent-hot),var(--accent))] text-[var(--accent-ink)] shadow-[0_8px_24px_rgba(240,197,10,0.25)] hover:brightness-105",
+        ghost:
+          "rounded-lg border border-[var(--line)] bg-transparent text-[var(--muted)] hover:border-[rgba(240,197,10,0.35)] hover:bg-[rgba(240,197,10,0.06)] hover:text-[var(--ink)]",
+        outline:
+          "rounded-lg border border-[var(--line)] bg-transparent text-[var(--ink)] hover:border-[rgba(240,197,10,0.35)]",
+      },
+      size: {
+        default: "h-11 px-6",
+        sm: "h-8 px-3 text-xs",
+        lg: "h-12 px-8 text-base",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+      size: "default",
+    },
+  }
+);
+
+export interface ButtonProps
+  extends React.ButtonHTMLAttributes<HTMLButtonElement>,
+    VariantProps<typeof buttonVariants> {
+  asChild?: boolean;
+}
+
+const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
+  ({ className, variant, size, asChild = false, ...props }, ref) => {
+    const Comp = asChild ? Slot : "button";
+    return (
+      <Comp
+        className={cn(buttonVariants({ variant, size, className }))}
+        ref={ref}
+        {...props}
+      />
+    );
+  }
+);
+Button.displayName = "Button";
+
+export { Button, buttonVariants };

components/ui/card.tsx

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+import * as React from "react";
+import { cn } from "@/lib/utils";
+
+export function Card({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) {
+  return (
+    <div
+      className={cn(
+        "rounded-[14px] border border-[var(--line)] bg-[color-mix(in_srgb,var(--bg-elev)_88%,transparent)] p-5 backdrop-blur-sm",
+        className
+      )}
+      {...props}
+    />
+  );
+}
+
+export function CardHeader({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) {
+  return (
+    <div
+      className={cn("mb-4 flex items-center justify-between gap-4", className)}
+      {...props}
+    />
+  );
+}
+
+export function CardTitle({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLHeadingElement>) {
+  return (
+    <h2
+      className={cn(
+        "font-[family-name:var(--font-display)] text-[1.05rem] font-bold tracking-tight",
+        className
+      )}
+      {...props}
+    />
+  );
+}