use summary image sizes

website/src/routes/coin/[coinSymbol]/+page.svelte

@@ -370,6 +370,7 @@
 		: `${coinSymbol} virtual cryptocurrency, crypto trading simulation, virtual coin trading`}
 	image={coin?.icon ? getPublicUrl(coin.icon) : '/apple-touch-icon.png'}
 	imageAlt={coin ? `${coin.name} (${coin.symbol}) logo` : `${coinSymbol} cryptocurrency logo`}
+	twitterCard="summary"
 />
 
 <SignInConfirmDialog bind:open={shouldSignIn} />

website/src/routes/user/[username]/+page.svelte

@@ -357,6 +357,7 @@
 		? `${profileData.profile.name}'s profile picture`
 		: `@${username}'s profile`}
 	keywords="crypto trader profile game, virtual trading portfolio, cryptocurrency simulation game, user portfolio simulator"
+	twitterCard="summary"
 />
 
 <div class="container mx-auto max-w-6xl p-6">