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/package-manager-detector/dist/index.mjs

@@ -0,0 +1,6 @@
+export { COMMANDS, constructCommand, resolveCommand } from './commands.mjs';
+export { AGENTS, INSTALL_METADATA, INSTALL_PAGE, LOCKS } from './constants.mjs';
+export { detect, getUserAgent } from './detect.mjs';
+import 'node:fs/promises';
+import 'node:path';
+import 'node:process';