feat(newsletter): implement image fetching from WordPress storage

[Theo-lbg]

New change proposal

Thank you for contributing to XpeApp Android

This pull request refactors the way newsletter preview images are fetched and displayed. Instead of retrieving images directly from Firebase Storage in the FirebaseService, the logic now fetches images via the WordPress API using the WordpressRepository. The main changes include removing the image-fetching method from FirebaseService, introducing new methods in WordpressRepository and WordpressService to fetch images from WordPress, and updating the NewsletterViewModel to use this new approach.

Change category

• Feature

Description

Newsletter image fetching refactor:

• Removed the getLastNewsletterPreview method from FirebaseService, eliminating direct Firebase Storage access for newsletter images.
• Added a new getImage method to WordpressRepository to fetch image bytes from the WordPress API, including error handling.
• Updated WordpressService with a new endpoint method fetchImageStorage to retrieve images from the WordPress backend.
• Modified NewsletterViewModel to use WordpressRepository.getImage for fetching and decoding newsletter preview images, replacing the old Firebase-based logic.

Code cleanup and dependency updates:

• Removed unused imports from FirebaseService and added necessary imports to NewslettersViewModel for image decoding and logging.

Screenshots (if any)

Image with the actual Newsletter and picture in the table local.

Checklist

• I have tested my changes in local using android mobile physical
• The previous tests still works
• I did not broke anything to ensure reverse compatibility
• README updated