refs #128

This reduces the number of permission checks and also ensures that the
button will only show up, when the dialog is available as well ruling
out any typos in the permission names *cough*.

refs #300

fixes #302

We already have a proper search implementation that we should use for
in-app filtering.

refs #128

refs #128

refs #301

refs #128

refs #301

Unfortunately, this commit combines a few changes:

* the calendar day view now uses the /program endpoint
  like the week view and therefore no longer needs to generate
  slots that fill empty spots in the program
* the visual presentation has been reworked so that it is
  more in line with the changes to the week view
* the look has been changed to a continuous timelime
  giving users clear feedback on what has been broadcasted,
  what is being broadcasted and what will be broadcasted

refs #128

This allows us to visualize a continuous program in the week view
without the need to manually generate slots to fill empty spots in the
program.

refs #128

This store exposes a continuous program that is broadcasted for a radio.

refs #128

`npx $pkg` executes packages with their latest version which is not
something we want for our tests. Instead we want to use the package
versions that have already been installed locally through `npm ci` that
contain a verified test environment.

refs #107

This ensures that a dark-scheme dialog used on a light-scheme page will
use the text color defined for the dialog and not the page.

In some cases the image would overflow its container or the metadata
form wouldn’t expand beyond a certain width.

Some users didn’t really know that they can re-order the order filter,
because they didn’t realize that the drag handle is a drag handle :).