[Bug] findings during testing

[dgraf-gh]

• creating a new user does not create a default device
• on starting with an empty DB Nominatim still has the highest priority
• latest location overlay does not have enough contrast against a satellite background
• loading a mapstyle to edit it, does not set the share with other users checkbox correctly
• device showOnMap and showAvatarOnMap are not persisted correctly
• cant delete device with an avatar associated
• improve rendering of aggregated timeline entries
• Months missing in aggregated mode. When selecting a Year, only the first and last 3 months are shown
• timeline needs a backdrop or somethin to catch scroll events so the map does not get zoomed when scrolling the timeline
• when displaying a weekly aggregate but starting at another day in that week, the ui is confusing since it displays as week but the data starts only from that day.
• re-evaluating trips should be a task