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/prismjs/plugins/show-invisibles/prism-show-invisibles.css

@@ -0,0 +1,34 @@
+.token.tab:not(:empty),
+.token.cr,
+.token.lf,
+.token.space {
+	position: relative;
+}
+
+.token.tab:not(:empty):before,
+.token.cr:before,
+.token.lf:before,
+.token.space:before {
+	color: #808080;
+	opacity: 0.6;
+	position: absolute;
+}
+
+.token.tab:not(:empty):before {
+	content: '\21E5';
+}
+
+.token.cr:before {
+	content: '\240D';
+}
+
+.token.crlf:before {
+	content: '\240D\240A';
+}
+.token.lf:before {
+	content: '\240A';
+}
+
+.token.space:before {
+	content: '\00B7';
+}