Create a category picker for product editing

[teolemon]

Who for

• Users

What

• A hierarchical category picker
  Design doc
• Async Category Picker #651
• Integrate the category picker within the product page #944

Why

• As a user who wants to get the Eco-Score or the Nutri-Score, I want to be able to input category without knowing the open food facts category system by heart.

Mockup

Integration with the product page

Picker

#### Ex-post mockup by Tim

Part of

• Add an Eco-Score completion pipeline #518
• Add a Nutri-Score completion pipeline #519

[gspencergoog]

@teolemon I think I'd like to take a stab at this one.

Should I add questions to the design doc, or here?

[teolemon]

The design doc is better for fast interactions and reformatting I'd say

[teolemon]

I've just added a mockup of a product page button by @greentoff for category addition in the initial issue.

[M123-dev]

We have long finished the category picker 😄