Improvements of the online store on yii2

Hello, the edits are small, but the code is "confusing"
The main things to do:
1. Automatic assignment of "product code" to new products no longer works
2. There were "extra" inscriptions in the cards
3. When hiding modifications (different volume) in the product cards, some of the hidden information is not removed
4. It is not clear how to remove the "promotional" price in the product cards
5. - a couple of insignificant trifles

From you experience with this framework and the desire to help)