Bundle elkjs into petrinaut instead of externalizing it

Import from elkjs/lib/elk-api (synchronous API) instead of the main
entry point, and move elkjs to devDependencies so it gets bundled into
the dist output. This avoids the web-worker resolution issue entirely
since elk-api doesn't reference it.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: kube

libs/@hashintel/petrinaut/package.json

@@ -43,7 +43,6 @@
     "@monaco-editor/react": "4.8.0-rc.3",
     "@xyflow/react": "12.10.1",
     "d3-scale": "4.0.2",
-    "elkjs": "0.11.0",
     "monaco-editor": "0.55.1",
     "react-icons": "5.5.0",
     "react-resizable-panels": "4.6.5",
@@ -65,6 +64,7 @@
     "@typescript/native-preview": "7.0.0-dev.20260315.1",
     "@vitejs/plugin-react": "6.0.1",
     "babel-plugin-react-compiler": "1.0.0",
+    "elkjs": "0.11.0",
     "jsdom": "24.1.3",
     "oxlint": "1.55.0",
     "oxlint-tsgolint": "0.17.0",

libs/@hashintel/petrinaut/src/lib/calculate-graph-layout.ts

@@ -1,5 +1,5 @@
-import type { ElkNode } from "elkjs";
-import ELK from "elkjs";
+import type { ElkNode } from "elkjs/lib/elk-api";
+import ELK from "elkjs/lib/elk-api";
 
 import type { SDCPN } from "../core/types/sdcpn";
 

libs/@hashintel/petrinaut/vite.config.ts

@@ -66,7 +66,6 @@ export default defineConfig(({ command }) => ({
   plugins: [
     esmExternalRequirePlugin({
       external: [
-        "elkjs",
         "react/compiler-runtime",
         "react/jsx-runtime",
         "react/jsx-dev-runtime",