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/runtime/client/only.js

@@ -0,0 +1,8 @@
+const onlyDirective = async (load) => {
+  const hydrate = await load();
+  await hydrate();
+};
+var only_default = onlyDirective;
+export {
+  only_default as default
+};