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/content/index.d.ts

@@ -0,0 +1,6 @@
+export { attachContentServerListeners } from './server-listeners.js';
+export { createContentTypesGenerator } from './types-generator.js';
+export { getContentPaths, hasAssetPropagationFlag } from './utils.js';
+export { astroContentAssetPropagationPlugin } from './vite-plugin-content-assets.js';
+export { astroContentImportPlugin } from './vite-plugin-content-imports.js';
+export { astroContentVirtualModPlugin } from './vite-plugin-content-virtual-mod.js';