fix(pnpm): move onlyBuiltDependencies to pnpm-workspace.yaml, add msw

pnpm 11 no longer reads the "pnpm" field from package.json; settings
belong in pnpm-workspace.yaml. Also adds msw to the allowlist which
was missing from the existing file.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -39,9 +39,6 @@
     "tailwind-merge": "^3.5.0",
     "zustand": "^5.0.11"
   },
-  "pnpm": {
-    "onlyBuiltDependencies": ["msw", "sharp", "unrs-resolver"]
-  },
   "devDependencies": {
     "@eslint/eslintrc": "^3.3.3",
     "@tailwindcss/postcss": "^4.2.0",

pnpm-workspace.yaml

@@ -1,3 +1,4 @@
 onlyBuiltDependencies:
+  - msw
   - sharp
   - unrs-resolver