The main map card (bosch-ebike-map-card) toolbar now has a play-icon button. Clicking it opens the currently shown ride in a fullscreen overlay containing the full 3D-card playback experience:
- 2D / 3D / Satellite mode toggle
- Chase-cam with slider + play/pause + EMA-smoothed marker
- North-up toggle (compass button on the map)
- Browser-fullscreen on top of the overlay
- Close via the × button or Escape
Implemented by spawning a transient bosch-ebike-3d-map-card instance with a new public openActivity(activity) API. Zero playback code is duplicated; everything that works in the 3D card now works from the 2D card too.