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-astro-server/response.d.ts

@@ -0,0 +1,8 @@
+import type http from 'node:http';
+import type { ErrorWithMetadata } from '../core/errors/index.js';
+import type { ModuleLoader } from '../core/module-loader/index.js';
+export declare function handle500Response(loader: ModuleLoader, res: http.ServerResponse, err: ErrorWithMetadata): Promise<void>;
+export declare function writeHtmlResponse(res: http.ServerResponse, statusCode: number, html: string): void;
+export declare function writeRedirectResponse(res: http.ServerResponse, statusCode: number, location: string): void;
+export declare function writeWebResponse(res: http.ServerResponse, webResponse: Response): Promise<void>;
+export declare function writeSSRResult(webRequest: Request, webResponse: Response, res: http.ServerResponse): Promise<void>;