chore(deps): update react monorepo to v19 (#523)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -58,8 +58,8 @@
     "@rollup/plugin-terser": "0.4.4",
     "@sanity/eslint-config-studio": "2.0.4",
     "@types/jest": "29.5.14",
-    "@types/react": "18.3.18",
-    "@types/react-dom": "18.3.5",
+    "@types/react": "19.0.2",
+    "@types/react-dom": "19.0.2",
     "@types/showdown": "2.0.6",
     "autoprefixer": "10.4.20",
     "@babel/eslint-parser": "7.25.9",
@@ -71,8 +71,8 @@
     "preact": "10.25.4",
     "preact-render-to-string": "5.2.6",
     "prettier": "2.8.8",
-    "react": "18.3.1",
-    "react-dom": "18.3.1",
+    "react": "19.0.0",
+    "react-dom": "19.0.0",
     "rollup": "3.29.5",
     "semantic-release": "24.2.0",
     "showdown": "2.1.0",