It is possible to enter more then 1 recipeCategory but only 1 is saved.

[Tux12Fun]

Description
You can enter more then 1 Category for a recipe. That would make sense to me becuase I wan't to enter a recipe to more then one category. But only the first is saved. So either decide to limit the Field, so that wie can enter only one or we should save all entered categories to the json.

Reproduction
Steps to reproduce the behavior:

1. Go to a recipe
2. Enter the first category,
3. Enter a second category
4. Click Save
5. And you have only 1 saved. But the user is confused and tries it again until. I found the filed in the Json is a string so i asume the developer thought of only one category. - If so it would be nice to have a tab Keywords in the Cookbook App so that I could use this as a comfortable Filter.

Expected behavior
Allow more then one category or only one.

Actual behavior
In reality only one of the Items is saved

Screenshots
If applicable, add screenshots to help explain your problem.

Browser
Google Chrome on Ubuntu Linux Version: 129.0.6668.100 (Offizieller Build) (64-Bit)

Versions
Nextcloud server version: 30.1
Cookbook version: 0.11.2
Database system: ext3 / MariaDB

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Depends on #1244

[christianlupus]

This is related to #2605

[github-actions]

This PR/issue depends on:

• Complete rework of frontend #1244
  By Dependent Issues (🤖). Happy coding!