This commit adds tests for all available sources.
This commit also fixes the parsing of Atom feeds for the RSS source,
where the `dc:date` field must be used for the `publishedAt` field.
When a Reddit post contained an image it was always rendered as table,
where the image was displayed in the left column and the author in the
right column. This looked very ugly in the app, so that we are now
removing all tables from the description of an Reddit post, so that the
image is rendered as large as possible and the author is displayed below
the image.
For the item ingestion logic we are now also looking at the published
date for all entries in a RSS feed. If the published date is older then
the last update date of a source the item will be skipped. This way we
should reduce the number of duplicated items, where an entry was updated
in the RSS feed, so that it had a new id and was written again to the
database and not only updated.
Improve the media handling within the app. We do not save the media
files for items to the Supabase storage anymore. The source icons are
now only saved in the Supabase storage, the usage of an url as source
icon is not possible anymore.
The media files for items are directly retrieved from the corresponding
url or for the web version from the "image-proxy-v1" Supabase function.
If the image is retireved from the Supabase function we cache the image
in the browser via the cache control headers. If the image is directly
retrieved from it's url it's cached by the "CachedNetworkImage" widget.
