fix: Fix product page syntax errors

1. Remove duplicate/broken code in product tables section
2. Fix PostCSS config for Tailwind 4
3. Add @tailwindcss/postcss dependency
4. Remove --production flag from Dockerfile (sharp required)

All fixes enable successful Docker build with favicon working.

node_modules/astro/dist/vite-plugin-astro-server/util.js

@@ -0,0 +1,8 @@
+import { isCSSRequest } from "vite";
+const rawRE = /(?:\?|&)raw(?:&|$)/;
+const inlineRE = /(?:\?|&)inline\b/;
+const isBuildableCSSRequest = (request) => isCSSRequest(request) && !rawRE.test(request) && !inlineRE.test(request);
+export {
+  isBuildableCSSRequest,
+  isCSSRequest
+};