chore: upgrade vitest from v3 to v4

app/package.json

@@ -103,8 +103,8 @@
     "@types/pg": "^8.15.6",
     "@types/react": "^19.0.10",
     "@types/react-dom": "^19.0.4",
-    "@vitejs/plugin-react": "^5.2.0",
-    "@vitest/coverage-v8": "3.0.9",
+    "@vitejs/plugin-react": "^6.0.1",
+    "@vitest/coverage-v8": "4.1.5",
     "autoprefixer": "^10.4.21",
     "clsx": "^2.1.1",
     "commander": "^14.0.2",
@@ -140,7 +140,7 @@
     "uuid": "^13.0.0",
     "vite": "^8.0.10",
     "vite-plugin-circular-dependency": "^0.5.0",
-    "vitest": "3.0.9",
+    "vitest": "4.1.5",
     "wouter": "^3.7.1",
     "wrangler": "^4.78.0"
   },