v0.27.0

• Show Reset only while paused. Reset always sets elapsed time to the current slide's expected start. It stays paused on ordinary slides, or becomes ready at that timestamp on a timer: start slide. Advancing starts from the preserved timestamp, which also survives saving and restoring the presentation.
• Describe the effect of slide timer metadata in the Next tooltip. Show an animated Auto-start indicator when advancing from the current slide will start the timer, with a tooltip explaining how to begin.
• Make Clock#reset! (or reset!(nil)) clear the clock to its initial, ready state. Passing a numeric elapsed time preserves whether it is running, or puts a ready clock into the paused state. Pass started: false to make the clock ready at a nonzero elapsed time.