Import glTF 2.0 files (.glb, .gltf) as mesh bodies (#1512)

glTF files open, insert and drop like 3MF/STL/OBJ: a component named after the file, the node tree as nested rigid components, repeated meshes as occurrences, metres to mm, Y up turned to Z up by default (up: z keeps axes), materials as PBR appearances. Bounded, hostile-input tested reader; no new persisted data. Closes #1505.

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

Cargo.lock

@@ -1531,6 +1531,42 @@ dependencies = [
  "web-sys",
 ]
 
+[[package]]
+name = "gltf"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3ce1918195723ce6ac74e80542c5a96a40c2b26162c1957a5cd70799b8cacf7"
+dependencies = [
+ "byteorder",
+ "gltf-json",
+ "lazy_static",
+ "serde_json",
+]
+
+[[package]]
+name = "gltf-derive"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14070e711538afba5d6c807edb74bcb84e5dbb9211a3bf5dea0dfab5b24f4c51"
+dependencies = [
+ "inflections",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "gltf-json"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6176f9d60a7eab0a877e8e96548605dedbde9190a7ae1e80bbcc1c9af03ab14"
+dependencies = [
+ "gltf-derive",
+ "serde",
+ "serde_derive",
+ "serde_json",
+]
+
 [[package]]
 name = "glutin"
 version = "0.32.3"
@@ -1877,6 +1913,12 @@ dependencies = [
  "hashbrown 0.17.1",
 ]
 
+[[package]]
+name = "inflections"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a257582fdcde896fd96463bf2d40eefea0580021c0712a0e2b028b60b47a837a"
+
 [[package]]
 name = "inout"
 version = "0.1.4"
@@ -2047,6 +2089,12 @@ dependencies = [
  "smallvec",
 ]
 
+[[package]]
+name = "lazy_static"
+version = "1.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "20870f649af7073d53e38067b2a84312175d56ea15217e1b15bc83506ec50afb"
+
 [[package]]
 name = "libc"
 version = "0.2.190"
@@ -3808,6 +3856,7 @@ dependencies = [
 name = "solidcraft-io"
 version = "0.13.0"
 dependencies = [
+ "gltf",
  "quick-xml",
  "serde",
  "serde_json",