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/actions/runtime/client.js

@@ -0,0 +1,11 @@
+export * from "./shared.js";
+function defineAction() {
+  throw new Error("[astro:action] `defineAction()` unexpectedly used on the client.");
+}
+function getActionContext() {
+  throw new Error("[astro:action] `getActionContext()` unexpectedly used on the client.");
+}
+export {
+  defineAction,
+  getActionContext
+};