chore: update dependencies and downgrade Express to 4.x

Update dependencies to latest versions:
- @typescript-eslint/eslint-plugin: 8.46.2 → 8.46.3
- @typescript-eslint/parser: 8.46.0 → 8.46.3
- concurrently: 9.2.0 → 9.2.1
- eslint: 9.38.0 → 9.39.1
- @types/node: 24.9.0 → 24.10.0
- @vitest/ui: 4.0.4 → 4.0.7
- jsdom: 27.0.1 → 27.1.0
- vite: 7.1.11 → 7.2.0
- vitest: 4.0.4 → 4.0.7

Downgrade Express 5.x to 4.21.2 to avoid npm workspaces bug with
incomplete transitive dependencies in package-lock.json (Dependabot
issue #6270). Express 5.x dependencies were not being properly installed
in npm workspaces with lockfileVersion 3.

Author: mldangelo

app/package.json

@@ -14,15 +14,15 @@
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.0",
     "@testing-library/user-event": "^14.6.1",
-    "@types/node": "^24.9.0",
+    "@types/node": "^24.10.0",
     "@types/react": "^19.2.2",
     "@types/react-dom": "^19.2.2",
     "@vitejs/plugin-react": "^5.1.0",
-    "@vitest/ui": "^4.0.4",
-    "jsdom": "^27.0.1",
+    "@vitest/ui": "^4.0.7",
+    "jsdom": "^27.1.0",
     "typescript": "^5.9.3",
-    "vite": "^7.1.11",
-    "vitest": "^4.0.4"
+    "vite": "^7.2.0",
+    "vitest": "^4.0.7"
   },
   "scripts": {
     "dev": "vite",