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/zod-to-json-schema/dist/esm/parsers/effects.js

@@ -0,0 +1,7 @@
+import { parseDef } from "../parseDef.js";
+import { parseAnyDef } from "./any.js";
+export function parseEffectsDef(_def, refs) {
+    return refs.effectStrategy === "input"
+        ? parseDef(_def.schema._def, refs)
+        : parseAnyDef(refs);
+}