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/server/render/astro/render-template.d.ts

@@ -0,0 +1,13 @@
+import type { RenderDestination } from '../common.js';
+declare const renderTemplateResultSym: unique symbol;
+export declare class RenderTemplateResult {
+    [renderTemplateResultSym]: boolean;
+    private htmlParts;
+    expressions: any[];
+    private error;
+    constructor(htmlParts: TemplateStringsArray, expressions: unknown[]);
+    render(destination: RenderDestination): void | Promise<void>;
+}
+export declare function isRenderTemplateResult(obj: unknown): obj is RenderTemplateResult;
+export declare function renderTemplate(htmlParts: TemplateStringsArray, ...expressions: any[]): RenderTemplateResult;
+export {};