chore(release): bump to 0.4.0

Fix repo URLs to canonical HakanSeven12/OpenCADStudio casing.

Co-Authored-By: Claude Opus 4.7 <[email protected]>

Cargo.lock

@@ -4,7 +4,7 @@ version = 4
 
 [[package]]
 name = "OpenCADStudio"
-version = "0.3.8"
+version = "0.4.0"
 dependencies = [
  "acadrust",
  "bytemuck",