[mcanouil]

Introduce support for tabset fragments in Reveal.js presentations, enabling incremental content reveal within tabs during presentations.

Update the changelog to reflect this new feature.

Code originally from https://github.com/mcanouil/quarto-revealjs-tabset

Feature request: #13712

Example:

---
title: "Quarto Playground"
format: revealjs
---

## Slide

:::: {.panel-tabset}

### Tab 1

This is a playground for Quarto.

### Tab 2

{{< lipsum 1 >}}

### Tab 3

![An image]({{< placeholder 600 400 >}}){#fig-placeholder}

:::

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[mcanouil]

Closing in favour of #15332, which rebuilds this as an opt-in tabset-fragments option.
It keeps one fragment order per slide, so incremental: true and stepped code highlights no longer collide with the tabs, and it shows the right tab after going back or following a deep link.