feat: node graph overlay; move to opencadcodec/opencadkernel/opencadgraph

The codec and kernel repositories and crates are renamed opencadcodec and
opencadkernel. Inside OCS they are depended on under short keys, so code
reads `codec::`, `kernel::` and the new `graph::` (opencadgraph, the node
graph engine). File-format and protocol spellings stay as they were: the
ACIS product id `acadrust`, the ACADRUST_* switches and the plugin
version keys `acadrust_version` / `acadrust_source`.

A button left of MCP on the command line opens a translucent node graph
over the viewport, with a palette of object, input, math, logic, list,
text and geometry nodes added by click or drag. An object node owns
drawing entities and its rows are the Properties panel's own rows for
them: the single-object page is extracted from refresh_properties as
entity_property_sections, values use the control protocol's
property_json, and writes go through set_property_value with a property
target override, so the panel, MCP and the graph share one read/write
path. A list reaching an object row makes one entity per element. Each
graph action is one undo step; the canvas pans and zooms.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/scene/model/image_model.rs

@@ -35,8 +35,8 @@ fn quad_verts(corners: &[[f32; 3]; 4], corners_low: &[[f32; 3]; 4]) -> Vec<Image
 /// image rectangle when unclipped, else the clip rectangle or the triangulated
 /// clip polygon. An inverted (show-outside) boundary isn't a simple filled
 /// region, so it falls back to the whole image rather than mis-clip.
-fn clip_triangles_px(img: &acadrust::entities::RasterImage) -> Vec<[f64; 2]> {
-    use acadrust::entities::{ClipMode, ClipType};
+fn clip_triangles_px(img: &codec::entities::RasterImage) -> Vec<[f64; 2]> {
+    use codec::entities::{ClipMode, ClipType};
     let w = img.size.x;
     let h = img.size.y;
     let quad = || {
@@ -115,7 +115,7 @@ impl ImageModel {
     /// Build an ImageModel from a DXF RasterImage entity.
     /// Returns `None` if the image file cannot be opened or decoded.
     pub fn from_raster_image(
-        img: &acadrust::entities::RasterImage,
+        img: &codec::entities::RasterImage,
     ) -> Option<Self> {
         let w = img.size.x;
         let h = img.size.y;
@@ -196,11 +196,11 @@ impl ImageModel {
     /// inverted. `None` when the underlay is off, non-PDF, or the page can't
     /// be rendered (caller keeps the outline placeholder).
     pub fn from_underlay(
-        u: &acadrust::entities::Underlay,
-        def: &acadrust::entities::UnderlayDefinition,
+        u: &codec::entities::Underlay,
+        def: &codec::entities::UnderlayDefinition,
         background: [f32; 4],
     ) -> Option<Self> {
-        use acadrust::entities::{UnderlayDisplayFlags, UnderlayType};
+        use codec::entities::{UnderlayDisplayFlags, UnderlayType};
         use super::pdf_raster::{self, PageAdjust};
         if !u.flags.contains(UnderlayDisplayFlags::ON) {
             return None;
@@ -290,8 +290,8 @@ impl ImageModel {
 /// Visible region of an underlay page as triangles in page UV (0..1, y up):
 /// the whole page, the clip polygon, or — for an inverted clip — the page
 /// with the polygon cut out.
-fn underlay_visible_uv(u: &acadrust::entities::Underlay, page_w: f64, page_h: f64) -> Vec<[f64; 2]> {
-    use acadrust::entities::UnderlayDisplayFlags;
+fn underlay_visible_uv(u: &codec::entities::Underlay, page_w: f64, page_h: f64) -> Vec<[f64; 2]> {
+    use codec::entities::UnderlayDisplayFlags;
     let page = vec![[0.0, 0.0], [1.0, 0.0], [1.0, 1.0], [0.0, 1.0]];
     let whole = || vec![[0.0, 0.0], [1.0, 0.0], [1.0, 1.0], [0.0, 0.0], [1.0, 1.0], [0.0, 1.0]];
     let clip = crate::entities::underlay::clip_polygon_local(u);
@@ -300,9 +300,9 @@ fn underlay_visible_uv(u: &acadrust::entities::Underlay, page_w: f64, page_h: f6
     }
     let ring: Vec<[f64; 2]> = clip.iter().map(|p| [p[0] / page_w, p[1] / page_h]).collect();
     let (points, triangles) = if u.clip_inverted {
-        cadkernel::geom2d::triangulate(&page, &[ring])
+        kernel::geom2d::triangulate(&page, &[ring])
     } else {
-        cadkernel::geom2d::triangulate(&ring, &[])
+        kernel::geom2d::triangulate(&ring, &[])
     };
     triangles
         .into_iter()
@@ -316,7 +316,7 @@ impl ImageModel {
     /// metafile picture (rasterized by the `gdi` player); returns `None` when
     /// the frame is degenerate or nothing in the blob decodes, so the caller
     /// falls back to the frame placeholder.
-    pub fn from_ole2frame(ole: &acadrust::entities::Ole2Frame) -> Option<Self> {
+    pub fn from_ole2frame(ole: &codec::entities::Ole2Frame) -> Option<Self> {
         let payload = ole.encoded_payload();
         let (pixels, width, height) = super::ole_pres::decode(&payload)?;