html_export_graph_interaction

The interactive export graph should support dragging nodes and panning or zooming the viewport, aligned with view_controls and manual_reframe.
Click-through to idea pages must remain available after drag via click-versus-drag discrimination.
A Fit control should reframe the viewport to the current node set without restarting layout or clearing live physics state.
Zoom and Fit must continuously drive graph_label_auto / html_export_graph_label_auto opacity when Labels is in auto mode.

Interactive page: html_export_graph_interaction