feat(usage): show 30-minute trend ticks and restore light theme

index.html

@@ -15,7 +15,7 @@
           : window.matchMedia?.('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
         document.documentElement.dataset.theme = theme;
         document.documentElement.style.colorScheme = theme;
-        document.documentElement.style.backgroundColor = theme === 'dark' ? '#111412' : '#f6f7f5';
+        document.documentElement.style.backgroundColor = theme === 'dark' ? '#0b0d11' : '#f6f7f5';
       })();
     </script>
     <title>EasyCLIProxyAPI</title>