chore(studio): update color scheme navbar (#9465)

update color scheme

Co-authored-by: Francisco Mazzoni <francisco@supabase.io>

studio/styles/main.scss

@@ -216,6 +216,12 @@ div.fixed.inset-0 {
   }
 }
 
+@media (prefers-color-scheme: dark) {
+  html {
+    color-scheme: dark;
+  }
+}
+
 .text-area-resize-none {
   textarea {
     @apply resize-none;