html_export_graph_interaction

Katz 0.085

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.
When file_treatment_toggle is compound: file bounding boxes are hittable — drag moves member nodes together;
clicking the underlined title navigates to the hosting file page ( when `hostFilePageUrl` / `pageUrl` is present ).
When linked: synthetic file ideaset nodes are dragged and clicked like other leaves.
Related: file_treatment_toggle,
webview_export_graph_parity.

implementation

app.js, mod.rs

Interactive page: html_export_graph_interaction