site: fall back to username on /apps page

site/src/routes/apps/index.svelte

@@ -50,9 +50,9 @@
 			<h1>Your apps</h1>
 
 			<div class="user">
-				<img class="avatar" alt="{user.name} avatar" src="{user.avatar}">
+				<img class="avatar" alt="{user.name || user.username} avatar" src="{user.avatar}">
 				<span>
-					{user.name}
+					{user.name || user.username}
 					(<a on:click|preventDefault={logout} href="auth/logout">log out</a>)
 				</span>
 			</div>