Editor version history and faster deck review

The editor now includes version history for signed-in users. You can save a named checkpoint before a bigger edit, then restore one of the latest checkpoints if a template, brand, or deck-wide change needs to be rolled back.

Longer carousels are also easier to review. The new slide overview shows the deck as a grid so you can jump to a slide or adjust slide order without scrolling through the canvas.

SlideDrift also shows the limited Pro launch offer in more high-intent upgrade moments, including the shared upgrade prompt and guest export paywall, and scheduled-post failure notices now use clearer action-oriented explanations.