WidgetSync now redraws the quick-timer tile on its own model rather than
on the timers alone, so a duration restored from a backup reaches it too
and no writer has to ask for a redraw by hand.
A transient timer the tile created but never got running is deleted on
the next tap instead of sitting idle in the Timers list for good.
The tile model loses its unused action enum: an Active supertype carries
the timer id every reset needs.