fix: Add typography guidance comment

- Recommend .text-base (16px) as minimum readable size
- Advise against .text-xs (12px) and .text-sm (14px) for body content
- No automatic replacements - guidance only for future development

src/styles/globals.css

@@ -90,3 +90,10 @@
     font-size: 1.25rem !important; /* 20px on extra large screens */
   }
 }
+
+/*
+ * Typography Best Practices:
+ * - Use .text-base (16px) as minimum for readable text
+ * - Avoid .text-xs (12px) and .text-sm (14px) for body content
+ * - For less emphasis, use color (text-secondary-600) not smaller size
+ */