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/scene/pick/hit_test.rs

@@ -1271,28 +1271,6 @@ fn indexed_box_crossing_hits<'a, W: WireSource + ?Sized>(
         segment_hits(a, b).then_some(wire.name.as_str())
     };
 
-    // A crossing selection over a whole drawing spends its time here, not in
-    // the window branch of `box_hit`: every measured `select-commit` line read
-    // `crossing=true`.
-    //
-    // The scan stops projecting a wire once that wire is in. A circle or a
-    // polyline contributes one segment per tessellated span, and every span
-    // after the first that hits can only re-add a name already present — at 24
-    // spans per wire that is 23 projection pairs out of 24 skipped, which took
-    // a 4.4 M-segment scan from ~1 s to 42 ms. The wire is keyed by index, an
-    // integer to hash rather than a string, and the name set still runs behind
-    // it because one entity can produce several wires sharing a name.
-    //
-    // Fanning this out across cores was tried and removed: with the early-out
-    // the remaining work is small enough that per-chunk sets, which cannot see
-    // wires already hit in another chunk, measured *slower* than one pass
-    // (45.6 ms against 42.4 ms at 186 468 wires).
-    // A bitmap over wire indices rather than a hash set: this is consulted once
-    // per segment, triangle and glyph inside the box — millions of times on a
-    // whole-drawing selection — and an array index beats hashing a `u32`, let
-    // alone hashing the wire's name, which is what the primitive loops below
-    // used to do. `seen` stays for the names, because several wires can share
-    // one entity's name and the output dedups by name.
     let mut wire_hit: Vec<bool> = Vec::new();
     fn mark(wire_hit: &mut Vec<bool>, wire: u32) {
         let index = wire as usize;
@@ -1377,10 +1355,6 @@ fn indexed_box_crossing_hits<'a, W: WireSource + ?Sized>(
 
     // Degenerate point-only wires have no indexed segment or surface primitive.
     for wire in wires.iter() {
-        // Structural tests first: `||` short-circuits, so putting the name
-        // lookup last means a wire with two or more points — very nearly all
-        // of them — is dropped without hashing its name. This loop walks every
-        // candidate, so that was one string hash per wire in the box.
         if wire.points.len() >= 2
             || !wire.fill_tris.is_empty()
             || !wire.pick_tris.is_empty()
@@ -1591,10 +1565,6 @@ fn indexed_polygon_crossing_hits<'a, W: WireSource + ?Sized>(
         }
     }
     for wire in wires.iter() {
-        // Structural tests first: `||` short-circuits, so putting the name
-        // lookup last means a wire with two or more points — very nearly all
-        // of them — is dropped without hashing its name. This loop walks every
-        // candidate, so that was one string hash per wire in the box.
         if wire.points.len() >= 2
             || !wire.fill_tris.is_empty()
             || !wire.pick_tris.is_empty()
@@ -2773,13 +2743,6 @@ mod parallel_selection_tests {
     use crate::scene::pick::interaction_index::{InteractionCandidates, InteractionIndex};
     use std::sync::Arc;
 
-    // Enough wires to clear the 4096 default several times over, laid on a
-    // diagonal so the selection box catches a known prefix of them rather than
-    // all or nothing — an "everything hits" case would not notice a reordering.
-    // A drawing is not made of single segments: a circle or an arc tessellates
-    // into dozens of spans, and a polyline carries as many as it has vertices.
-    // A one-segment-per-wire sample makes the per-wire early-out invisible and
-    // the whole measurement optimistic, so the benchmark uses `spans` per wire.
     fn many_wires_with_spans(count: usize, spans: usize) -> Vec<WireModel> {
         (0..count)
             .map(|i| {
@@ -2804,10 +2767,6 @@ mod parallel_selection_tests {
             .collect()
     }
 
-    // Not a correctness test — a measurement, at the size the user's drawing
-    // actually is. Run it deliberately:
-    //
-    //     cargo test --release --lib selection_scaling -- --ignored --nocapture
     #[test]
     #[ignore = "measurement, not a check"]
     fn selection_scaling_numbers() {