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RmlUi only starts a transition on a class/definition change, never on the
inline data-style-transform the dock uses for slide, so keyboard/minimize/restore
open-close had stopped animating (snapped). Own the animation in C++ instead: a
pure SlideAnimator that every path flows through -- keyboard/minimize/restore play
it, a touch drag scrubs it (pause + set position from the finger), and release
resumes easing from the current position to the snap target. Duration + easing are
read from the #panel RCSS 'transition' via transition_timing(), so they stay
hot-reloadable and any named RmlUi tween works. Drives slide per frame via
request_frames; the surface now hides when the close animation completes (replaces
the old transitionend path). Body=drag-handle / panel=transform split preserved.
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