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/content/watcher.d.ts

@@ -0,0 +1,5 @@
+import type { FSWatcher } from 'vite';
+export type WrappedWatcher = FSWatcher & {
+    removeAllTrackedListeners(): void;
+};
+export declare function createWatcherWrapper(watcher: FSWatcher): WrappedWatcher;