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/regex/dist/esm/flag-n.d.ts

@@ -0,0 +1,4 @@
+export function flagNPreprocessor(value: import("./regex.js").InterpolatedValue, runningContext: import("./utils.js").RunningContext, options: Required<import("./regex.js").RegexTagOptions>): {
+    transformed: string;
+    runningContext: import("./utils.js").RunningContext;
+};