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/diff/libesm/util/array.js

@@ -0,0 +1,17 @@
+export function arrayEqual(a, b) {
+    if (a.length !== b.length) {
+        return false;
+    }
+    return arrayStartsWith(a, b);
+}
+export function arrayStartsWith(array, start) {
+    if (start.length > array.length) {
+        return false;
+    }
+    for (let i = 0; i < start.length; i++) {
+        if (start[i] !== array[i]) {
+            return false;
+        }
+    }
+    return true;
+}