update ui for consistent in light and dark mode

src/app/auth/create.tsx

@@ -52,6 +52,8 @@ export function CreateAccountScreen() {
         name: data.name,
         display_name: data.name,
         bio: data.about,
+        picture: picture,
+        avatar: picture,
       };
 
       const userPrivkey = generatePrivateKey();
@@ -105,7 +107,7 @@ export function CreateAccountScreen() {
       if (filePath) {
         await writeTextFile(
           filePath,
-          `Generated by Lume (lume.nu)\nPublic key: ${keys.npub}\nPrivate key: ${keys.nsec}`
+          `Nostr account, generated by Lume (lume.nu)\nPublic key: ${keys.npub}\nPrivate key: ${keys.nsec}`
         );
 
         setDownloaded(true);