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/@astrojs/internal-helpers/dist/fs.d.ts

@@ -0,0 +1,15 @@
+import type { PathLike } from 'node:fs';
+export declare function writeJson<T>(path: PathLike, data: T): Promise<void>;
+export declare function removeDir(dir: PathLike): Promise<void>;
+export declare function emptyDir(dir: PathLike): Promise<void>;
+export declare function getFilesFromFolder(dir: URL): Promise<URL[]>;
+/**
+ * Copies files into a folder keeping the folder structure intact.
+ * The resulting file tree will start at the common ancestor.
+ *
+ * @param {URL[]} files A list of files to copy (absolute path).
+ * @param {URL} outDir Destination folder where to copy the files to (absolute path).
+ * @param {URL[]} [exclude] A list of files to exclude (absolute path).
+ * @returns {Promise<string>} The common ancestor of the copied files.
+ */
+export declare function copyFilesToFolder(files: URL[], outDir: URL, exclude?: URL[]): Promise<string>;