improvement: Add React 19 support

Add react as a peer dependency (^18.0 || ^19.0) and upgrade dev
dependencies to React 19. No source changes needed as the library
only uses stable React APIs.

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

Author: Gido Manders

package-lock.json

@@ -22,15 +22,16 @@
   },
   "homepage": "https://github.com/42BV/react-authentication#readme",
   "peerDependencies": {
+    "react": "^18.0 || ^19.0",
     "react-router": "^6.0 || ^7.0"
   },
   "devDependencies": {
     "@eslint/js": "9.39.2",
     "@testing-library/jest-dom": "6.6.3",
-    "@testing-library/react": "16.0.1",
+    "@testing-library/react": "16.3.2",
     "@types/fetch-mock": "7.3.8",
-    "@types/react": "18.3.13",
-    "@types/react-dom": "18.3.1",
+    "@types/react": "19.2.13",
+    "@types/react-dom": "19.2.3",
     "@vitest/coverage-v8": "4.0.18",
     "eslint": "9.39.2",
     "eslint-config-prettier": "10.1.8",
@@ -44,8 +45,8 @@
     "node-fetch": "3.3.2",
     "np": "10.1.0",
     "prettier": "3.4.2",
-    "react": "18.3.1",
-    "react-dom": "18.3.1",
+    "react": "19.2.4",
+    "react-dom": "19.2.4",
     "react-router": "7.0.2",
     "typescript": "5.7.2",
     "typescript-eslint": "8.54.0",