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/libcjs/convert/dmp.js

@@ -0,0 +1,24 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.convertChangesToDMP = convertChangesToDMP;
+/**
+ * converts a list of change objects to the format returned by Google's [diff-match-patch](https://github.com/google/diff-match-patch) library
+ */
+function convertChangesToDMP(changes) {
+    var ret = [];
+    var change, operation;
+    for (var i = 0; i < changes.length; i++) {
+        change = changes[i];
+        if (change.added) {
+            operation = 1;
+        }
+        else if (change.removed) {
+            operation = -1;
+        }
+        else {
+            operation = 0;
+        }
+        ret.push([operation, change.value]);
+    }
+    return ret;
+}