feat: scan continuously while detecting motion

feat: wait 15s without motion before scanning

feat: lower default minimum blob size to 0.02% of the image

feat: make motion detection more sensitive by default

feat: tune detection sensitivity live from the settings page

fix: stop discarding darker objects as shadows

feat: enlarge and label the motion map

refactor: always track with the head

feat: show live motion map on the settings page

feat: scan for motion when the scene is idle

feat: add movement tracker app