* feat: 5553 - add prices for category products
New files:
* `price_category_input_page.dart`: Page that lets the user type in and select a single category for prices.
* `price_per_extension.dart`: Extension for PricePer.
Impacted files:
* `app_en.arb`: added 4 labels related to category and prices
* `app_fr.arb`: added 4 labels related to category and prices
* `background_task_add_other_price.dart`: added parameters related to category prices
* `background_task_add_price.dart`: added parameters related to category prices
* `background_task_price.dart`: added parameters related to category prices
* `price_add_product_card.dart`: added an "add category product" button
* `price_amount_card.dart`: added a DropDownButton for "price per" for category product
* `price_amount_model.dart`: taken category prices into consideration
* `price_existing_amount_card.dart`: unrelated localization
* `price_meta_product.dart`: added a new meta product, related to category
* `price_model.dart`: added parameters related to category prices
* `smooth_autocomplete_text_field.dart`: added an "onSelected" optional parameter, in order to be able to select immediately a suggestion
* `smooth_dropdown.dart`: added an "isExpanded" optional parameter, in order to match the screen width
* minor refactoring and localizations
Impacted files:
* `app_en.arb`: additional translations for "price per"
* `app_fr.arb`: additional translations for "price per"
* `price_existing_amount_field.dart`: localization
* `price_meta_product.dart`: minor refactoring
* `price_per_extension.dart`: additional translations for "price per"
* reformatting
* added origins and prepared code for labels
Impacted files:
* `app_en.arb`: improved a label and added 3 labels
* `app_fr.arb`: improved a label and added 3 labels
* `background_task_add_other_price.dart`: now setting origins and labels
* `background_task_add_price.dart`: now setting origins and labels
* `background_task_price.dart`: now setting origins and labels
* `price_add_product_card.dart`: refactored as we now set origins too (in addition to just category)
* `price_category_input_page.dart`: refactored as we now set origins too (in addition to just category)
* `price_existing_amount_card.dart`: display origins too
* `price_meta_product.dart`: now setting and displaying origins too
* `price_model.dart`: we now set origins too, and prepared code for labels when ready on the "prices" side
* `price_product_list_tile.dart`: now displaying origins too
* someone moved a file and that's not nice ;)
* explicit 1 line for autocomplete
* Improved nutrition input
* Translate all TODOs
* Loading + error states
* Update labeler
* "Add" icon with the same size as "Help"
* Fix light/dark mode switch issue
* Button to a nutrient at the bottom
* Remove warning
