The statement changed here creates new variables, whereas it means to
assign values to the previously declared `ao` to be used outside of the
if statement. This lead to PUT requests always being sent to a URL
containing a new UUID, causing problems with some CardDAV servers.
This causes the mailbox to automatically reload the page every 60
seconds, without JavaScript.
This also updates the base template data to include the full URL, and
replaces the earlier "Path" field with a pre-split array of path
components, which is more immediately useful to most templates given the
limitations of string munging with text/template primitives.
A new minimal CardDAV plugin is introduced. It injects a list of e-mail
addresses in the e-mail compose view.
References: https://todo.sr.ht/~sircmpwn/koushin/7
