Update font family to SpaceMono monospace

Author: ralyodio

public/css/theme.css

@@ -65,7 +65,7 @@
   --shadow-lg: 0 10px 15px -3px var(--shadow-color);
 
   /* Font settings */
-  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
+  --font-family: 'SpaceMono', monospace;
   --font-size-xs: 0.75rem;         /* 12px */
   --font-size-sm: 0.875rem;        /* 14px */
   --font-size-md: 1rem;            /* 16px */