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/stringify-entities/lib/index.js

@@ -0,0 +1,36 @@
+/**
+ * @typedef {import('./core.js').CoreOptions & import('./util/format-smart.js').FormatSmartOptions} Options
+ * @typedef {import('./core.js').CoreOptions} LightOptions
+ */
+
+import {core} from './core.js'
+import {formatSmart} from './util/format-smart.js'
+import {formatBasic} from './util/format-basic.js'
+
+/**
+ * Encode special characters in `value`.
+ *
+ * @param {string} value
+ *   Value to encode.
+ * @param {Options} [options]
+ *   Configuration.
+ * @returns {string}
+ *   Encoded value.
+ */
+export function stringifyEntities(value, options) {
+  return core(value, Object.assign({format: formatSmart}, options))
+}
+
+/**
+ * Encode special characters in `value` as hexadecimals.
+ *
+ * @param {string} value
+ *   Value to encode.
+ * @param {LightOptions} [options]
+ *   Configuration.
+ * @returns {string}
+ *   Encoded value.
+ */
+export function stringifyEntitiesLight(value, options) {
+  return core(value, Object.assign({format: formatBasic}, options))
+}