Dev and Test run fixed. New Datepicker. Tests fixed. Message bookmarking fixed.

package.json

@@ -12,7 +12,7 @@
     "prod:full": "npm-run-all --parallel preview server:prod",
     "server:prod": "npm run start:prod --prefix server",
     "server:test": "npm run start:test --prefix server",
-    "test:full": "npm-run-all --parallel dev server:test"
+    "test:full": "cross-env BACKEND_PORT=3201 npm-run-all --parallel dev server:test"
   },
   "dependencies": {
     "@dnd-kit/core": "^6.3.1",
@@ -36,6 +36,7 @@
     "@vitejs/plugin-react": "^5.0.0",
     "autoprefixer": "^10.4.22",
     "concurrently": "^8.2.2",
+    "cross-env": "^10.1.0",
     "postcss": "^8.5.6",
     "tailwindcss": "^3.4.17",
     "typescript": "~5.8.2",