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/@astrojs/telemetry/dist/post.js

@@ -0,0 +1,11 @@
+const ASTRO_TELEMETRY_ENDPOINT = `https://telemetry.astro.build/api/v1/record`;
+function post(body) {
+  return fetch(ASTRO_TELEMETRY_ENDPOINT, {
+    method: "POST",
+    body: JSON.stringify(body),
+    headers: { "content-type": "application/json" }
+  });
+}
+export {
+  post
+};