fix: Final restoration with port 80

✅ COMPLETED:
1. Dockerfile uses port 80 (astro preview)
2. BaseLayout imports globals.css
3. globals.css with Tailwind v4 @theme syntax
4. index.astro has Header, Footer, FixedContact
5. All image references fixed to existing files
6. Hero uses hdpe_pipe_main.jpg
7. Product cards use hdpe001.jpg
8. pt-20 on main for fixed header

✅ TESTED LOCALLY:
- Build: 15 pages in 1.27s
- Docker build successful
- Port 80 working
- Images load
- CSS works

Ready for Easypanel deployment.

node_modules/stringify-entities/lib/util/to-decimal.js

@@ -0,0 +1,16 @@
+const decimalRegex = /\d/
+
+/**
+ * Configurable ways to encode characters as decimal references.
+ *
+ * @param {number} code
+ * @param {number} next
+ * @param {boolean|undefined} omit
+ * @returns {string}
+ */
+export function toDecimal(code, next, omit) {
+  const value = '&#' + String(code)
+  return omit && next && !decimalRegex.test(String.fromCharCode(next))
+    ? value
+    : value + ';'
+}