Support Mastodon API push subscription type "poll"
Mastodon added in 2.8.0 the ability to subscribe for push notifications to be notified "when a poll you voted in or created has ended".
As a poll creator: this is straightforward
As a poll participant: unsure how this is meant to work. Is there a notification coming from the origin server where the poll was created, or is it expected that this is tracked locally by your own instance?