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/regex/dist/esm/utils-internals.d.ts

@@ -0,0 +1,15 @@
+/**
+Updates the array in place by incrementing each value greater than or equal to the threshold.
+@param {Array<number>} arr
+@param {number} threshold
+*/
+export function incrementIfAtLeast(arr: Array<number>, threshold: number): void;
+export const noncapturingDelim: any;
+/**
+@param {string} str
+@param {number} pos
+@param {string} oldValue
+@param {string} newValue
+@returns {string}
+*/
+export function spliceStr(str: string, pos: number, oldValue: string, newValue: string): string;