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/env/errors.js

@@ -0,0 +1,16 @@
+function invalidVariablesToError(invalid) {
+  const _errors = [];
+  for (const { key, type, errors } of invalid) {
+    if (errors[0] === "missing") {
+      _errors.push(`${key} is missing`);
+    } else if (errors[0] === "type") {
+      _errors.push(`${key}'s type is invalid, expected: ${type}`);
+    } else {
+      _errors.push(`The following constraints for ${key} are not met: ${errors.join(", ")}`);
+    }
+  }
+  return _errors;
+}
+export {
+  invalidVariablesToError
+};