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/diff/libesm/util/array.js

@@ -0,0 +1,17 @@
+export function arrayEqual(a, b) {
+    if (a.length !== b.length) {
+        return false;
+    }
+    return arrayStartsWith(a, b);
+}
+export function arrayStartsWith(array, start) {
+    if (start.length > array.length) {
+        return false;
+    }
+    for (let i = 0; i < start.length; i++) {
+        if (start[i] !== array[i]) {
+            return false;
+        }
+    }
+    return true;
+}