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/env/validators.d.ts

@@ -0,0 +1,15 @@
+import type { EnvFieldType } from './schema.js';
+export type ValidationResultValue = EnvFieldType['default'];
+export type ValidationResultErrors = ['missing'] | ['type'] | Array<string>;
+interface ValidationResultValid {
+    ok: true;
+    value: ValidationResultValue;
+}
+export interface ValidationResultInvalid {
+    ok: false;
+    errors: ValidationResultErrors;
+}
+type ValidationResult = ValidationResultValid | ValidationResultInvalid;
+export declare function getEnvFieldType(options: EnvFieldType): string;
+export declare function validateEnvVariable(value: string | undefined, options: EnvFieldType): ValidationResult;
+export {};