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/polyfill.js

@@ -0,0 +1,17 @@
+import buffer from "node:buffer";
+import crypto from "node:crypto";
+function apply() {
+  if (!globalThis.crypto) {
+    Object.defineProperty(globalThis, "crypto", {
+      value: crypto.webcrypto
+    });
+  }
+  if (!globalThis.File) {
+    Object.defineProperty(globalThis, "File", {
+      value: buffer.File
+    });
+  }
+}
+export {
+  apply
+};