Remove input hook
Calculate a reasonable bounds for the page based on its section postions
For page routes, set the page resource controller’s boundsRect property to the page bounds
For section routes, set the page resource controller’s boundsRect property to the section bounds
Add a section property to the page controller for section routes
Implementation of section area overlays, and drag/drop interface for moving section boundaries around and recording their logical position. Various related CSS updates. Provisional commit, there’s debug stuff mixed in here.