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/media.prebuilt.js

@@ -0,0 +1,4 @@
+var media_prebuilt_default = `(()=>{var n=(a,t)=>{let i=async()=>{await(await a())()};if(t.value){let e=matchMedia(t.value);e.matches?i():e.addEventListener("change",i,{once:!0})}};(self.Astro||(self.Astro={})).media=n;window.dispatchEvent(new Event("astro:media"));})();`;
+export {
+  media_prebuilt_default as default
+};