🎨 Restore from commit 5b041a6 + fix all issues

Restored Header and Footer from best commit (5b041a6) + fixes:

FIXES:
✅ Font size reduced to 16px base (was 18px)
✅ No font scaling on large screens (stays 18px)
✅ Cookie banner: solid bg-gray-900, no transparency
✅ Cookie buttons: solid green/gray colors
✅ Header overlap: Pages have pt-32 padding
✅ Footer: Has privacy/terms links restored

COLORS:
- Green: bg-green-600 (solid)
- Gray: bg-gray-900, bg-gray-700 (solid)
- No transparency anywhere

Build: 11 pages ✅

dist/manifest.json

@@ -1,26 +0,0 @@
-{
-  "name": "Deal Plus Tech",
-  "short_name": "DPT",
-  "description": "ผู้เชี่ยวชาญด้านระบบน้ำ จำหน่ายท่อ PPR, ท่อ HDPE, รั้วตาข่าย, อุปกรณ์ท่อน้ำ",
-  "start_url": "/",
-  "display": "standalone",
-  "background_color": "#ffffff",
-  "theme_color": "#1e40af",
-  "orientation": "portrait-primary",
-  "icons": [
-    {
-      "src": "/favicon-512.jpg",
-      "sizes": "512x512",
-      "type": "image/jpeg",
-      "purpose": "any maskable"
-    },
-    {
-      "src": "/favicon-512.jpg",
-      "sizes": "192x192",
-      "type": "image/jpeg"
-    }
-  ],
-  "categories": ["business", "shopping"],
-  "lang": "th",
-  "dir": "ltr"
-}