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/runtime/client/dev-toolbar/ui-library/icon.d.ts

@@ -0,0 +1,10 @@
+import { type Icon } from './icons.js';
+export declare class DevToolbarIcon extends HTMLElement {
+    _icon: Icon | undefined;
+    shadowRoot: ShadowRoot;
+    get icon(): Icon | undefined;
+    set icon(name: Icon | undefined);
+    constructor();
+    getIconHTML(icon: Icon | undefined): string;
+    buildTemplate(): void;
+}