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/assets/fonts/infra/system-fallbacks-provider.d.ts

@@ -0,0 +1,6 @@
+import type { SystemFallbacksProvider } from '../definitions.js';
+import type { FontFaceMetrics, GenericFallbackName } from '../types.js';
+export declare class RealSystemFallbacksProvider implements SystemFallbacksProvider {
+    getLocalFonts(fallback: GenericFallbackName): Array<string> | null;
+    getMetricsForLocalFont(family: string): FontFaceMetrics;
+}