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/utils.js

@@ -0,0 +1,16 @@
+const ACTION_API_CONTEXT_SYMBOL = Symbol.for("astro.actionAPIContext");
+const formContentTypes = ["application/x-www-form-urlencoded", "multipart/form-data"];
+function hasContentType(contentType, expected) {
+  const type = contentType.split(";")[0].toLowerCase();
+  return expected.some((t) => type === t);
+}
+function isActionAPIContext(ctx) {
+  const symbol = Reflect.get(ctx, ACTION_API_CONTEXT_SYMBOL);
+  return symbol === true;
+}
+export {
+  ACTION_API_CONTEXT_SYMBOL,
+  formContentTypes,
+  hasContentType,
+  isActionAPIContext
+};