continue polish, prepare launch v1.0.0

src/shared/notes/mentions/user.tsx

@@ -7,7 +7,7 @@ export function MentionUser({ pubkey }: { pubkey: string }) {
 
 	return (
 		<Link
-			href={`/user?pubkey=${pubkey}`}
+			href={`/app/user?pubkey=${pubkey}`}
 			className="text-fuchsia-500 hover:text-fuchsia-600 no-underline font-normal"
 		>
 			@{user?.name || user?.displayName || shortenKey(pubkey)}

src/shared/notes/preview/link.tsx

@@ -29,6 +29,7 @@ export function LinkPreview({ urls }: { urls: string[] }) {
 							src={data["og:image"]}
 							alt={urls[0]}
 							className="w-full h-44 object-cover rounded-t-lg bg-white"
+							fallback="https://void.cat/d/XTmrMkpid8DGLjv1AzdvcW"
 						/>
 					)}
 					<div className="flex flex-col gap-2 px-3 py-3">