Add download photo button to custom request detail page

- Create DownloadPhotoButton component for downloading customer photos
- Add download button before 'Start a design for this' button
- Allows admin to save photo locally for editing in design software before approval

Addresses user request: admin should be able to download photo from request
for editing before uploading final design to the approval flow.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/components/DownloadPhotoButton.tsx

@@ -0,0 +1,27 @@
+'use client';
+
+interface DownloadPhotoButtonProps {
+  photoUrl: string;
+  customerName: string;
+}
+
+export default function DownloadPhotoButton({ photoUrl, customerName }: DownloadPhotoButtonProps) {
+  const handleDownload = () => {
+    // Create a link element and trigger download
+    const link = document.createElement('a');
+    link.href = photoUrl;
+    link.download = `photo-from-${customerName.toLowerCase().replace(/\s+/g, '-')}.png`;
+    document.body.appendChild(link);
+    link.click();
+    document.body.removeChild(link);
+  };
+
+  return (
+    <button
+      onClick={handleDownload}
+      className="border border-ink px-6 py-3 text-sm hover:border-clay hover:bg-clay hover:text-paper"
+    >
+      Download photo
+    </button>
+  );
+}