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/prismjs/plugins/download-button/prism-download-button.js

@@ -0,0 +1,20 @@
+(function () {
+
+	if (typeof Prism === 'undefined' || typeof document === 'undefined' || !document.querySelector) {
+		return;
+	}
+
+	Prism.plugins.toolbar.registerButton('download-file', function (env) {
+		var pre = env.element.parentNode;
+		if (!pre || !/pre/i.test(pre.nodeName) || !pre.hasAttribute('data-src') || !pre.hasAttribute('data-download-link')) {
+			return;
+		}
+		var src = pre.getAttribute('data-src');
+		var a = document.createElement('a');
+		a.textContent = pre.getAttribute('data-download-link-label') || 'Download';
+		a.setAttribute('download', '');
+		a.href = src;
+		return a;
+	});
+
+}());