* feat: Enhanced sender avatars with gravatar and favicons integration
* chore: Remove unused known companies thumbnails
* feat(thumbnail): add IThumbnailService and refactor usage
- Introduced a new interface `IThumbnailService` for handling thumbnail-related functionalities.
- Registered `IThumbnailService` with its implementation `ThumbnailService` in the service container.
- Updated `NotificationBuilder` to use an instance of `IThumbnailService` instead of static methods.
- Refactored `ThumbnailService` from a static class to a regular class with instance methods and variables.
- Modified `ImagePreviewControl` to utilize the new `IThumbnailService` instance.
- Completed integration of `IThumbnailService` in the application by registering it in `App.xaml.cs`.
* style: Show favicons as squares
- Changed `hintCrop` in `NotificationBuilder` to `None` for app logo display.
- Added `FaviconSquircle`, `FaviconImage`, and `isFavicon` to `ImagePreviewControl` for favicon handling.
- Updated `UpdateInformation` method to manage favicon visibility.
- Introduced `GetBitmapImageAsync` for converting Base64 to Bitmap images.
- Enhanced XAML to include `FaviconSquircle` for improved UI appearance.
* refactor thumbnail service
* Removed old code and added clear method
* added prefetch function
* Change key from host to email
* Remove redundant code
* Test event
* Fixed an issue with the thumbnail updated event.
* Fix cutted favicons
* exclude some domain from favicons
* add yandex.ru
* fix buttons in settings
* remove prefetch method
* Added thumbnails propagation to mailRenderingPage
* Revert MailItemViewModel to object
* Remove redundant code
* spaces
* await load parameter added
* fix spaces
* fix case sensativity for mail list thumbnails
* change duckdns to google
* Some cleanup.
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Co-authored-by: Aleh Khantsevich <aleh.khantsevich@gmail.com>
Co-authored-by: Burak Kaan Köse <bkaankose@outlook.com>
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