Walkthroughs get a presentation look

Answers told as narrated walkthroughs now look like a real slide deck. Titles are set large in a grotesque face. Points sit on panels and flows are boxes joined by drawn arrows, and whatever is being explained lifts in Obeya's blue. Below the slide, a progress bar has one segment per slide that you can click to jump. The spoken sentence stands large enough to read along, two lines at a time, and C or the CC button switches it off and on, remembered for the next walkthrough. It works in light and dark.