fix: keep exact snapping, source drawing data and adaptive options layout

Resolve curve intersections through cadkernel, retain empty exact results, gather analytic candidates independently of tessellation, and bound material uploads. Preserve large MINSERT data while limiting rendering work; remove obsolete review narratives.

src/app/update/viewport.rs

@@ -4251,10 +4251,6 @@ properties={:.1}ms picked={}",
                 if box_anchor.is_none() {
                     let (view_rot, eye, all_wires) = self.pick_view(i, &edit_cam, bounds);
                     let click_world = self.cursor_model_point(i, &edit_cam, p, bounds);
-                    // The click that *starts* a window: the pick under the cursor decides
-                    // whether this selects an entity or arms a box, and it runs before the
-                    // rubber band can appear. Timed separately from the commit, which is
-                    // what `select-commit` covers.
                     let t_arm = crate::perf::enabled().then(Instant::now);
                     let prior_selection = self.tabs[i].scene.selected.len();
                     let click_candidates = self.tabs[i].scene.interaction_pick_candidates_near(