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/astro/dist/vite-plugin-html/transform/utils.d.ts

@@ -0,0 +1,5 @@
+import type { Element } from 'hast';
+import type MagicString from 'magic-string';
+export declare function replaceAttribute(s: MagicString, node: Element, key: string, newValue: string): MagicString | undefined;
+export declare function needsEscape(value: any): value is string;
+export declare function escapeTemplateLiteralCharacters(value: string): string;