Show current running task

When users have many tasks configured, it becomes harder to find the currently running task to stop it or enter a note for the task entry.

If this setting is enabled, we will show "current running task" at the top of the "Today" tab, below the daily overview section.

If only one task entry is running, the user can tap the "Edit" button to edit the current running entry or the "Stop" button to stop the currently running task entry.

If there is more than one task entry running, the user can tap the box and choose whether to edit or stop the task entry.