Using J/K to navigate cards in JIRA Software Active Sprints/Kanban board doesn't announce to screen readers

Using J/K to navigate cards provides them with an explicit focused style, but it isn't actually shifting focus. This means screen readers are not provided with any feedback.

Suggested fix is to apply tabindex="-1" to each card, or alternatively make each column a separate tab target with tabindex="0", and use aria-activedescendant to manage the focus of items within each column. The first option is probably the simplest and would perform more consistently across different browser/screen reader combinations.