Interactive slides: support Clickable/Draggable/Hoverable objects in Player slidesMode

[maloyan]

Description

Follow-up to #215 (comment: #215 (comment)). @Wizorx asked:

is there an option to interact with a slide? Like adding a static one, or one with a moving/rotating/draggable/clickable object which can be interacted with?

What already exists:

• Interaction primitives for a live Scene: makeDraggable, makeClickable, makeHoverable, SelectionManager (src/interaction/)
• Slides mode in Player (slidesMode, nextSlide({ loop, autoNext })) from Slides behavior #215
• Static slides are achievable via wait() + nextSlide(); perpetual animation via nextSlide({ loop: true })

The gap — these two systems don't compose:

1. Player manages its own render loop, which stops entirely while paused on a slide (Player.ts _startLoop, the loop bails when !this._isPlaying). Interaction handlers (e.g. Draggable) mutate mobjects but never call scene.render(), so dragging/clicking on a paused slide produces no visual feedback.
2. On a looping slide, MasterTimeline.seek() re-applies recorded values every frame, overwriting any user-driven changes to animated properties.
3. Player never wires up or exposes the interaction classes; there is no documented/tested path to attach them to player.scene, and no example combining slidesMode with Clickable/Draggable.

Use Case

Live presentations where a slide contains an object the audience/presenter can rotate, drag, or click — e.g. a draggable point on a graph that updates a plotted curve while the slide loops.

Proposed Solution

• Keep rendering (or render on-demand) while paused on a slide so interaction handlers have visual feedback — e.g. interaction classes request a render via the scene, or Player runs a lightweight idle render loop in slidesMode.
• Let interactive state survive looping slides: either exclude user-modified mobjects from timeline re-application during a loop, or document that interactive mobjects should not be animated within a looping slide.
• Add a player.interactive opt-in (or just an example + docs) showing makeDraggable/makeClickable attached to player.scene in slidesMode.