Export Step Thumbnails with Prompt and Voiceover Text

Summary:

Enable export of each step’s thumbnail image along with its associated prompt text and voiceover text for use in external tools.

Details:

To support consistency across demos created in Supademo and other platforms (e.g., ChatGPT or design tools), it would be helpful to export a structured set of assets: one image per step (the thumbnail), along with the prompt text and voiceover text for that step. This would simplify workflows for teams building companion demos, documentation, or localized content outside of Supademo.