Add vegan/vegetarian filter toggles to ingredient autocompleter

[stuckvgn]

Summary

Companion frontend to wger-project/wger#2218, which adds is_vegan and is_vegetarian fields to the Ingredient model and exposes them via the ingredientinfo API endpoint.

This PR surfaces those fields in the meal form ingredient search so users can filter results by dietary preference directly in the autocompleter.

Changes:

• ApiIngredientType — add is_vegan: boolean | null and is_vegetarian: boolean | null
• Ingredient model — add isVegan / isVegetarian properties with adapter mapping from JSON
• searchIngredient() service — accept optional isVegan / isVegetarian params, passed as ?is_vegan=true / ?is_vegetarian=true query params to the ingredientinfo API
• IngredientAutocompleter — add "Vegan only" and "Vegetarian only" Switch toggles rendered as a row below the search input; toggling either filter immediately re-triggers search
• i18n — add nutrition.filterVegan and nutrition.filterVegetarian translation keys
• Tests — update ingredient service fixture and assertions to include the new fields

Behaviour

When both toggles are off (default), search behaves exactly as before — no dietary filter params are sent. Enabling a toggle appends ?is_vegan=true or ?is_vegetarian=true to the API query. Both can be enabled simultaneously.

Ingredients with NULL dietary status (unknown) are excluded when a filter is active, since the API uses exact matching (True/False/NULL).

Dependencies

Requires wger-project/wger#2218 to be merged and the ingredientinfo API to return is_vegan / is_vegetarian fields. The autocompleter degrades gracefully before that — the new fields will just be null on all ingredients and the toggle UI still renders, it just won't filter anything until the backend lands.

[rolandgeider]

you're on fire! I'll try to look at this later

[rolandgeider]

FYI, I moved the options to a popup, if we add more in the future, having them inline doesn't scale. I have also renamed the labels from "vegan only" to just "vegan" as I think this is clearer

[stuckvgn]

The PR has been updated to align with the approach you implemented — filters are in a popup (Popover with TuneIcon), and labels use 'Vegan' / 'Vegetarian' without 'only'. Also added the missing filterVegan / filterVegetarian keys to the German translation (de/translation.json).

[stuckvgn]

Closing this PR — on reflection, this change may not be the right fit for this project. Thanks for your time!

[stuckvgn]

Apologies for the accidental close — this has your feedback incorporated and is ready for review.

[coveralls]

coverage: 74.893%. remained the same
when pulling 1eba9fb on stuckvgn:feature/ingredient-dietary-filters
into 1632cb2 on wger-project:master.