fix: hide URL preview in in-app download guide

Drop the visible URL box from the modal — only the Copy link button remains. Copy still writes the absolute file download URL to the clipboard so the user can paste it into Chrome/Safari to trigger the download.

src/components/InAppDownloadGuide.tsx

@@ -154,12 +154,6 @@ export function InAppDownloadGuideProvider({
                     </li>
                   </ol>
 
-                  <div className="rounded-2xl border border-white/10 bg-black/30 p-3">
-                    <p className="break-all text-xs leading-5 text-neutral-300">
-                      {detail.url}
-                    </p>
-                  </div>
-
                   <button
                     type="button"
                     onClick={handleCopy}