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/core/index.js

@@ -0,0 +1,11 @@
+import { default as _sync } from "./sync/index.js";
+import { default as default2 } from "./build/index.js";
+import { default as default3 } from "./dev/index.js";
+import { default as default4 } from "./preview/index.js";
+const sync = (inlineConfig) => _sync(inlineConfig);
+export {
+  default2 as build,
+  default3 as dev,
+  default4 as preview,
+  sync
+};