Merge pull request #1301: Add associative viewport dimensions

Refresh associations after complete SpaceMouse camera updates and recognize imported paper-space owners without Layout objects. Use kernel containment, intersection, perpendicular and spline tangent solving; pin cadkernel 7ce27f2 and add regressions.

src/app/update/mod.rs

@@ -95,6 +95,7 @@ mod file;
 mod style;
 mod util;
 mod viewport;
+mod viewport_snap;
 
 impl OpenCADStudio {
     pub(in crate::app) fn reset_modal_geometry(&mut self) {