New file:
* `background_task_upload.dart`: Background task about generic file upload.
Impacted files:
* `abstract_background_task.dart`: added a `recover` abstract method
* `background_task_crop.dart`: now extends new class `BackgroundTaskUpload`
* `background_task_image.dart`: now extends new class `BackgroundTaskUpload`
* `background_task_manager.dart`: now calls `recover`for each task at run time; minor fix about "internet error"
* `background_task_unselect.dart`: minor refactoring; minor fix removing the transient file
* `crop_page.dart`: minor refactoring
* `edit_ingredients_page.dart`: minor refactoring
* `image_upload_card.dart`: minor refactoring
* `product_cards_helper.dart`: minor refactoring
* `product_image_viewer.dart`: minor refactoring
* `smooth_product_image.dart`: minor refactoring
* `transient_file.dart`: refactored as a "real" class, not a static one
* feat: 3897 - no language selector for gallery, only for swipeable page
Main changes:
* `app_en.arb`: added 2 translations ("no image" / "no image for that language")
* `app_fr.arb`: added 2 translations ("no image" / "no image for that language")
* `nutrition_page_loaded.dart`: removed an implicit `language` parameter
* `product_cards_helper.dart`: refactoring
* `product_image_gallery_view.dart`: removed the language selector
* `product_image_swipeable_view.dart`: removed the language parameter; now we always start with the app language
* `product_image_viewer.dart`: now always displays the (non) image for the specified language, with additional labels; added explicit `language` parameters
* `transient_file.dart`: new method `getImageLanguages`
Added explicit `language` parameters for:
* `add_new_product_page.dart`: added an explicit `language` parameter
* `background_task_crop.dart`: added an explicit `language` parameter
* `background_task_image.dart`: added an explicit `language` parameter
* `background_task_unselect.dart`: added an explicit `language` parameter
* `edit_ingredients_page.dart`: added an explicit `language` parameter
* `edit_new_packagings.dart`: added an explicit `language` parameter
* `image_crop_page.dart`: added an explicit `language` parameter
* `image_upload_card.dart`: added an explicit `language` parameter
* `new_crop_page.dart`: added an explicit `language` parameter
* `product_image_local_button.dart`: added an explicit `language` parameter
* `product_image_server_button.dart`: added an explicit `language` parameter
* `uploaded_image_gallery.dart`: added an explicit `language` parameter
* feat: 3897 - slightly related refactoring around ImageFieldSmoothieExtension
* feat: 3897 - minor fix for TEST env
Impacted files:
* `background_task_crop.dart`: added language to transient file key
* `background_task_image.dart`: added language to transient file key
* `background_task_unselect.dart`: unrelated removal of not used fields
* `edit_ingredients_page.dart`: now we display localized images
* `image_upload_card.dart`: added language to transient file key
* `ocr_widget.dart`: added language to transient file key
* `product_cards_helper.dart`: now returns a localized image; refactored; new method `getLocalizedProductImageUrl`
* `product_image_carousel.dart`: now we display localized images
* `product_image_gallery_view.dart`: now we display localized images
* `product_image_swipeable_view.dart`: now we display localized images
* `product_image_viewer.dart`: now we display localized images
* `product_query.dart`: unrelated removal of not used field
* `product_refresher.dart`: unrelated minor refactoring
* `smooth_product_image.dart`: now we display localized images
* `transient_file.dart`: added language to transient file key
* `up_to_date_changes.dart`: unrelated removal of not used fields
Impacted files:
* `background_task_image.dart`: explicitly deleting the file at the end of the task.
* `new_crop_page.dart`: changed the directory to a "not temporary" one
* `transient_file.dart`: finally only dealing with removing transient files, not the actual OS file
Impacted files:
* `paged_to_be_completed_product_query.dart`: renamed `State` as `ProductState`
* `paged_user_product_query.dart`: created local `UserSearchType` instead of deprecated off-dart `UserProductSearchType`; used `ProductSearchQueryConfiguration` instead of deprecated `UserProductSearchQueryConfiguration`
* `product_query.dart`: now that we use fully v3, we don't need the temporary field list for user-related queries with v2
* `pubspec.lock`: wtf
* `pubspec.yaml`: upgrade to off-dart 2.0.0
* `user_preferences_account.dart`: now using new local class `UserSearchType`
* and reduced all off-dart imports to a single `import 'package:openfoodfacts/openfoodfacts.dart';`
New files:
* `ocr_widget.dart`: Widget dedicated to OCR, with 3 actions: upload image, extract data, save. Used to be in `edit_ingredients_page.dart`
* `transient_file.dart`: Helper class about transient files (= not fully uploaded yet).
Impacted files:
* `add_basic_details_page.dart`: minor refactoring
* `add_new_product_page.dart`: refactored around the class image repository
* `app_en.arb`: added 1 label when OCR fails
* `app_fr.arb`: added 1 label when OCR fails
* `background_task_details.dart`: minor refactoring
* `background_task_image.dart`: immediate execution with just one try
* `confirm_and_upload_picture.dart`: minor refactoring with new private class `_OutlinedButton`
* `edit_ingredients_page.dart`: moved `OcrWidget` code to dedicated new dart file; fixed the extract button - that cannot be reached if the image is not uploaded yet
* `image_crop_page.dart`: refactored with more explicit method names
* `image_upload_card.dart`: refactored with `TransientFile`
* `new_product_page.dart`: minor refactoring
* `product_cards_helper.dart`: minor refactoring
* `product_image_carousel.dart`: minor refactoring
* `product_image_gallery_view.dart`: refactored with new method `confirmAndUploadNewPicture` and new class `TransientFile`
* `product_image_viewer.dart`: refactored with new class `TransientFile`
* `question_card.dart`: minor refactoring
* `smooth_product_image.dart`: refactored with new class `TransientFile`
