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/cli/info/infra/npm-package-manager.d.ts

@@ -0,0 +1,10 @@
+import type { CommandExecutor } from '../../definitions.js';
+import type { PackageManager } from '../definitions.js';
+export declare class NpmPackageManager implements PackageManager {
+    #private;
+    readonly name: string;
+    constructor({ commandExecutor }: {
+        commandExecutor: CommandExecutor;
+    });
+    getPackageVersion(name: string): Promise<string | undefined>;
+}