[chore] Make changing the name of a REPL obvious (#6808)

Author: baseballyama

site/src/routes/repl/[id]/_components/AppControls/index.svelte

@@ -265,9 +265,17 @@ export default app;` });
 		opacity: 0.7;
 		outline: none;
 		flex: 1;
+		margin: 0 0.2em 0 .4rem;
+		padding-top: 0.2em;
+		border-bottom: 1px solid transparent;
 	}
 
+	input:hover {
+		border-bottom: 1px solid currentColor;
+		opacity: 1;
+	}
 	input:focus {
+		border-bottom: 1px solid currentColor;
 		opacity: 1;
 	}