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/hmr.d.ts

@@ -0,0 +1,10 @@
+import type { HmrContext } from 'vite';
+import type { Logger } from '../core/logger/core.js';
+import type { CompileMetadata } from './types.js';
+interface HandleHotUpdateOptions {
+    logger: Logger;
+    astroFileToCompileMetadata: Map<string, CompileMetadata>;
+}
+export declare function handleHotUpdate(ctx: HmrContext, { logger, astroFileToCompileMetadata }: HandleHotUpdateOptions): Promise<import("vite").ModuleNode[] | undefined>;
+export declare function isStyleOnlyChanged(oldCode: string, newCode: string): boolean;
+export {};