fix navbar and guest user checks

previously guest users would cause a response 500 if a private album existed, meaning they couldn't see any albums
they also couldn't load media in any album due to requiring an access token

frontend/src/gallery/index.jsx

@@ -51,7 +51,7 @@ export default function Gallery() {
     }, [currentAlbumID])
 
     return (
-        <div className="flex flex-col items-center justify-start h-full w-full bg-[#141414]">
+        <div className="flex flex-col items-center justify-start min-h-screen w-full bg-[#141414]">
             <NavBar path={pathList} />
             <AlbumList currentAlbumName={currentAlbumID} />
             <MediaList albumId={currentAlbumID} albumName={currentAlbumName} />