See every slide in a slideshow, its settings and where it plays

Returns a slideshow in full: every slide in order (with a thumbnailUrl to see what is on it, its type, duration, hidden flag, and rules: every visibility rule covering it, each with a plain-English summary), its ticker and clock settings, renderStatus (changes reach screens once it is Completed), and the screens playing it now, each with a playerUrl that shows the result in any browser. While a render is queued or in progress, renderProgress gives percent (0 to 100, so 0.85 is under one percent, and it stays below 100 until the render completes), the current phase in English (or a queued job's place in line, e.g. "3 renders ahead of yours"), and etaSeconds when it can be estimated; it is omitted once nothing is actively rendering. Poll at most every 5 seconds.