This refactoring includes some fixes, new features,
and updates to the API:

* the new /media and /media-sources APIs are used
* users can now cancel the addition of new media sources
* all errors should now be catched and displayed, no matter when
  in the handling process they happen
* users can show the import logs for uploads
* uploads happen in the background so users can move to
  other pages without aborting the upload

refs #347
refs #328
refs #323
refs #342
refs #273

refs #343

refs #343

This was confusing for users.

refs #310

refs: #327

The anchor-positioning polyfill doesn’t properly work with dynamic
elements and re-applying styles every time dynamic elements are rendered
is too brittle.

See: https://github.com/oddbird/css-anchor-positioning/issues/91

This reverts commit ffe576b1.

refs #318

This commit removes the old note handling and replaces it with the new
timeslot-independent episodes.

refs #317

Co-Authored-By: Alex Gorji <ag@roko.li>

refs #314

Up until now we retrieved __all__ shows when loading the dashboard. This
can be a lot of data (7.5MiB on dashboard.aura.radio). This was
necessary because the show selector was still based on the data in the
show store.

The show selector now uses the API to query shows.

refs aura#389
refs #228

I was mistaken in believing that users should be able to edit their own
user properties. We still want to check the appropriate permissions for
that.

refs #298

refs #298
refs #86

refs #86