update React support

Author: gabrielmfern

package.json

@@ -36,7 +36,7 @@
   "devDependencies": {
     "@changesets/cli": "^2.26.2",
     "@react-email/render": "0.0.7",
-    "@types/react": "18.2.8",
+    "@types/react": "19.0.0",
     "@vitest/coverage-v8": "2.1.8",
     "happy-dom": "^15.11.7",
     "react": "18.2.0",
@@ -46,7 +46,7 @@
     "vitest": "2.1.8"
   },
   "peerDependencies": {
-    "react": "18.x"
+    "react": "^18.0 || ^19.0"
   },
   "dependencies": {
     "marked": "7.0.4"