Jamie-Lynn Sigler joins Lifetime’s “women in jeopardy” sorority in “The Neighbor in the Window,” a thriller airing Saturday (8 p.m.) The former “Sopranos” star, 38, plays bubbly Karen Morgan, who relocates with her husband Scott (Geoff Gustafson) and young son Miles (Azriel Dalman) to rainy Seattle — where she encounters perky-yet-creepy neighbor Lisa Beasley (Jenn...