fix: move Google Fonts to HTML head to resolve CSS @import order warning

frontend/src/styles.css

@@ -1,5 +1,4 @@
 @import "tailwindcss";
-@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=IBM+Plex+Mono:wght@400;500;600;700&display=swap');
 
 @theme {
   --color-primary: oklch(0.08 0 0);