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/@tailwindcss/vite/dist/index.d.mts

@@ -0,0 +1,13 @@
+import { Plugin } from 'vite';
+
+type PluginOptions = {
+    /**
+     * Optimize and minify the output CSS.
+     */
+    optimize?: boolean | {
+        minify?: boolean;
+    };
+};
+declare function tailwindcss(opts?: PluginOptions): Plugin[];
+
+export { type PluginOptions, tailwindcss as default };