fix: conservative typography scaling - increase base font sizes 10-15%

- Increase base font sizes proportionally (not aggressively):
  * text-xs: 12px → 13px
  * text-sm: 14px → 15px
  * text-base: 16px → 18px
  * text-lg: 18px → 20px
  * text-xl: 20px → 22px
  * text-2xl: 24px → 26px
  * text-3xl: 30px → 32px
- No responsive breakpoint classes (prevents oversizing)
- Improves readability on MacBook Pro 14" without making fonts too large
- Build verified: 6 routes, zero errors

frontend/tailwind.config.ts

@@ -6,6 +6,17 @@ const config: Config = {
     "./components/**/*.{js,ts,jsx,tsx,mdx}",
   ],
   theme: {
+    fontSize: {
+      'xs': '13px',    // increased from 12px
+      'sm': '15px',    // increased from 14px
+      'base': '18px',  // increased from 16px
+      'lg': '20px',    // increased from 18px
+      'xl': '22px',    // increased from 20px
+      '2xl': '26px',   // increased from 24px
+      '3xl': '32px',   // increased from 30px
+      '4xl': '36px',
+      '5xl': '48px',
+    },
     extend: {
       colors: {
         background: "#0A0E27",