Fix critical Burmese typography and layout issues

- Update .font-burmese line-height to 1.85 (critical fix for text overlap)
- Set article content line-height to 2.0 for better readability
- Add Padauk font as fallback for better Myanmar script support
- Update all heading line-heights to 1.75 for proper spacing
- Reduce hero section height (600px → 350px mobile, 450px desktop)
- Improve font-size consistency (1.125rem for body text)

Addresses typography crisis identified in site review.

frontend/app/page.tsx

@@ -59,7 +59,7 @@ export default async function ImprovedHome() {
     <div className="min-h-screen bg-gradient-to-b from-gray-50 to-white">
       {/* Hero Section with Featured Article */}
       {featured && (
-        <section className="relative h-[600px] w-full overflow-hidden fade-in">
+        <section className="relative h-[350px] md:h-[450px] w-full overflow-hidden fade-in">
           <Image
             src={featured.featured_image || '/placeholder.jpg'}
             alt={featured.title_burmese}