fix(mobile): build canvas-editor CSS bundle during EAS install

CanvasEditorDOM.tsx imports @gruenerator/canvas-editor/styles/bundle
which points at ./dist/canvas-editor-bundle.css — a Tailwind-compiled
artifact generated by the package's build:css script. Nothing in EAS's
pipeline invokes that script, so Metro's DOM-component bundler fails
with "Unable to resolve module".

Adding the eas-build-post-install hook runs tailwindcss immediately
after pnpm install, before prebuild/bundle, so the artifact exists by
the time Metro resolves the import. Web and desktop are unaffected —
Vite compiles Tailwind in-process.

Author: Movm

apps/mobile/package.json

@@ -22,7 +22,8 @@
     "lint": "eslint .",
     "lint:fix": "eslint . --fix",
     "build:android": "EAS_NO_VCS=1 eas build -p android --profile production",
-    "build:android:preview": "EAS_NO_VCS=1 eas build -p android --profile preview"
+    "build:android:preview": "EAS_NO_VCS=1 eas build -p android --profile preview",
+    "eas-build-post-install": "pnpm -w --filter @gruenerator/canvas-editor build:css"
   },
   "dependencies": {
     "@assistant-ui/react-native": "^0.1.11",