Remove unused UiPreview helper after FirmwarePreview landed.

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

components/ui-preview.tsx

@@ -1,27 +0,0 @@
-"use client";
-
-import { cn } from "@/lib/utils";
-
-/** Scales an on-device HTML mock (320×240) into the card / detail media slot. */
-export function UiPreview({
-  src,
-  className,
-  title,
-}: {
-  src: string;
-  className?: string;
-  title?: string;
-}) {
-  return (
-    <div className={cn("relative h-full w-full overflow-hidden bg-[#0a0806]", className)}>
-      <iframe
-        src={src}
-        title={title || "Firmware UI preview"}
-        className="pointer-events-none absolute inset-0 h-full w-full border-0"
-        loading="lazy"
-        sandbox="allow-scripts"
-        tabIndex={-1}
-      />
-    </div>
-  );
-}