1. Increased SLEEP_MIN_MS to 60s and SLEEP_MAX_MS to 240s so the cat takes real
naps (1-4 min) instead of waking up after only a few seconds.
2. Increased SIT_MIN_MS to 15s and SIT_MAX_MS to 45s.
3. Added 'youtube', 'youtube.com/shorts', 'instagram', and 'twitch' to default
distraction keywords. Browser tabs playing YouTube Shorts have titles like
'<Video Title> - YouTube - Google Chrome' where 'shorts' does not appear.