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/app/mtext_editor.rs

@@ -5,13 +5,13 @@
 // the real entity is re-tessellated into the scene's preview wires on every
 // change so the user sees the actual drawing result while typing.
 
-use acadrust::entities::mtext::AttachmentPoint;
-use acadrust::entities::mtext_format::{
+use codec::entities::mtext::AttachmentPoint;
+use codec::entities::mtext_format::{
     parse_mtext, MTextColor, MTextDocument, MTextFont, MTextParagraph, MTextParagraphAlignment,
     MTextScalar, MTextSpan, ParagraphProperties, SpanProperties, StackingData, StackingType,
 };
-use acadrust::types::Vector3;
-use acadrust::{EntityType, Handle, MText};
+use codec::types::Vector3;
+use codec::{EntityType, Handle, MText};
 use glam::DVec3;
 use iced::widget::text_editor;
 
@@ -88,7 +88,7 @@ pub struct MTextEditorState {
     pub pos: DVec3,
     /// The editable text buffer (raw value with inline codes).
     pub content: text_editor::Content,
-    /// Structured mirror of `content`, parsed via acadrust `parse_mtext` — the
+    /// Structured mirror of `content`, parsed via opencadcodec `parse_mtext` — the
     /// target authority for the editor. Phase 1: passive mirror kept in sync on
     /// every rebuild, cross-checked against the rendered glyph boxes; later
     /// phases make it the source of truth and delete the raw-string path.
@@ -255,7 +255,7 @@ impl MTextEditorState {
     /// Fold the toolbar's global defaults (font / colour / oblique / width /
     /// char-spacing) onto every span that does not already override them. This
     /// replaces the old hand-built `\f;\C;…` prefix so the value is produced
-    /// purely by acadrust's `to_mtext_string`.
+    /// purely by opencadcodec's `to_mtext_string`.
     fn apply_globals(&self, doc: &mut MTextDocument) {
         let font = self.font.trim();
         let color =
@@ -288,7 +288,7 @@ impl MTextEditorState {
     }
 
     /// The committed / previewed MText value: the structured body with the
-    /// global toolbar defaults folded in, serialized by acadrust.
+    /// global toolbar defaults folded in, serialized by opencadcodec.
     fn folded_value(&self) -> String {
         let raw = self.content.text();
         let mut doc = parse_mtext(&raw, true);
@@ -1562,8 +1562,8 @@ impl super::OpenCADStudio {
     /// Apply a colour from the shared Properties-style picker: to the selection
     /// (per-run) when there is one, else the whole text via the global colour.
     /// Closes the picker popup.
-    pub(super) fn mtext_apply_color(&mut self, color: acadrust::types::Color) {
-        use acadrust::types::Color as C;
+    pub(super) fn mtext_apply_color(&mut self, color: codec::types::Color) {
+        use codec::types::Color as C;
         let (mcolor, rgb): (Option<MTextColor>, Option<(u8, u8, u8)>) = match color {
             C::Index(i) => (Some(MTextColor::Index(i as u16)), None),
             C::Rgb { r, g, b } => (None, Some((r, g, b))),
@@ -1725,7 +1725,7 @@ impl super::OpenCADStudio {
                 mt.insertion_point.y,
                 mt.insertion_point.z,
             ));
-            mt.insertion_point = acadrust::types::Vector3::new(
+            mt.insertion_point = codec::types::Vector3::new(
                 position.x,
                 position.y,
                 position.z,
@@ -1844,7 +1844,7 @@ impl super::OpenCADStudio {
                 mt.insertion_point.y,
                 mt.insertion_point.z,
             ));
-            mt.insertion_point = acadrust::types::Vector3::new(
+            mt.insertion_point = codec::types::Vector3::new(
                 position.x,
                 position.y,
                 position.z,
@@ -2038,7 +2038,7 @@ mod cell_tests {
     // round-trip so the renderer actually sees them.
     #[test]
     fn per_run_color_and_font_persist() {
-        use acadrust::entities::mtext_format::{MTextColor, MTextFont};
+        use codec::entities::mtext_format::{MTextColor, MTextFont};
         let mut p = SpanProperties::default();
         p.color = Some(MTextColor::Index(1)); // red
         p.font = Some(MTextFont::with_flags("Arial".to_string(), true, false)); // bold Arial