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/widest-line/readme.md

@@ -0,0 +1,26 @@
+# widest-line
+
+> Get the visual width of the widest line in a string - the number of columns required to display it
+
+Some Unicode characters are [fullwidth](https://en.wikipedia.org/wiki/Halfwidth_and_fullwidth_forms) and use double the normal width. [ANSI escape codes](http://en.wikipedia.org/wiki/ANSI_escape_code) are stripped and doesn't affect the width.
+
+Useful to be able to know the maximum width a string will take up in the terminal.
+
+## Install
+
+```sh
+npm install widest-line
+```
+
+## Usage
+
+```js
+import widestLine from 'widest-line';
+
+widestLine('古\n\u001B[1m@\u001B[22m');
+//=> 2
+```
+
+## Related
+
+- [string-width](https://github.com/sindresorhus/string-width) - Get the visual width of a string