The task-numbers slice added a UNIQUE index on tasks.number. Ui.Tests seed
TaskEntity rows directly instead of going through TaskRepository, so every row
kept the default Number = 0 and 31 tests failed with
'UNIQUE constraint failed: tasks.number'.
Switching lists rebuilt Tasks.Items from scratch but left SelectedTask pointing
at a row from the previous list, so the detail pane kept showing that task even
though it is not in the visible list. Drop the selection when the list actually
changes; a reload of the same list (worker refresh, reconnect) keeps it so a
live update never yanks the detail pane away.
mika kuns