feat(nutrition): persist ingredient search filters to localStorage

[sputnik-mac]

Summary

Fixes #1210

The ingredient search filters (language, vegan, vegetarian) were reset on every page load. This PR saves them to localStorage and restores them on mount.

Changes

IngredientAutcompleter.tsx

• Initialize languageFilter, filterVegan, and filterVegetarian from localStorage (with appropriate defaults if not set)
• Add three useEffect hooks to persist each filter value to localStorage whenever it changes

Behavior

• Users who prefer vegan/vegetarian filters will find them already checked when they return
• The language filter preference is remembered across sessions
• First-time users still get the sensible defaults (language-aware for the language filter, false for vegan/vegetarian)
• The existing logic that resets current_english → current when the UI language is English still works correctly

Testing

Manually verified:

1. Set filters (e.g. vegan=true, language=all)
2. Reload the page
3. Filters are restored correctly

[rolandgeider]

thanks for the PR!! Could you perhaps add some simple tests that check that the values are saved to local storage?

[rolandgeider]

merged thanks!