fix: upgrade @testing-library/jest-dom for vitest 2.x type compatibility (#21)

The v6.6.0 module augmentation for vitest's Assertion interface was
broken with vitest 2.x. Upgrading to v6.9.1 fixes the ~47 typecheck
errors (toBeInTheDocument, toHaveAttribute). Also adds vitest.d.ts to
ensure the type augmentation is included in tsc compilation.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

packages/web/package.json

@@ -23,16 +23,16 @@
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4.0.0",
-    "@testing-library/jest-dom": "^6.6.0",
+    "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.1.0",
     "@types/react": "^19.0.0",
     "@types/react-dom": "^19.0.0",
     "@vitejs/plugin-react": "^4.3.0",
     "jsdom": "^25.0.0",
-    "tailwindcss": "^4.0.0",
-    "typescript": "^5.7.0",
     "playwright": "^1.49.0",
+    "tailwindcss": "^4.0.0",
     "tsx": "^4.19.0",
+    "typescript": "^5.7.0",
     "vitest": "^2.1.0"
   }
 }

packages/web/src/vitest.d.ts

@@ -0,0 +1 @@
+import "@testing-library/jest-dom/vitest";

pnpm-lock.yaml

@@ -338,7 +338,7 @@ importers:
         specifier: ^4.0.0
         version: 4.1.18
       '@testing-library/jest-dom':
-        specifier: ^6.6.0
+        specifier: ^6.9.1
         version: 6.9.1
       '@testing-library/react':
         specifier: ^16.1.0