Don't shorten the item description (as much), include ellipsis if shortened

[qazmlp]

(Filed originally as stevencrader/podcastap#8 since I couldn't find this repository.)

While Mastodon has a relatively low character limit by default, this isn't applied to externally-received posts, so you can show (much) more text there. When you do shorten it, it would be helpful to have an indicator like […] to make it clear the text isn't just cut off by mistake. Maybe a "Read more" would be possible, if you can identify a web page for the feed item.

Longer posts wouldn't be annoying to receive since fediverse software is generally very good at collapsing long posts into a "read more" fadeout automatically. (The current post length is enough to trigger this in the mobile app.)
Mastodon will show media attachments outside of this collapsed section, so no UX breakdown in that regard either.

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One reason the current limit concerns me is that it cuts off the funding links of a podcast I follow.
(It doesn't have the necessary metadata to display the "FUNDING" profile attachment, as it's hosted on Spotify.)