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/shiki/dist/core-unwasm.mjs

@@ -0,0 +1,4 @@
+import { setDefaultWasmLoader } from '@shikijs/engine-oniguruma';
+export * from '@shikijs/core';
+
+setDefaultWasmLoader(() => import('shiki/wasm'));