feat: lower React peer dependency requirement to ^16.8.0

- Change React peer dependency from ^19.1.0 to ^16.8.0
- Change React DOM peer dependency from ^19.1.0 to ^16.8.0
- Update @types/react and @types/react-dom to ^18.2.0
- Bump version to 0.4.0

This resolves dependency conflicts with projects using React 18.x
and makes the package compatible with React 16.8+ (when hooks were introduced).

Author: MauritsBrinkman

package.json

@@ -1,6 +1,6 @@
 {
   "name": "captide",
-  "version": "0.3.2",
+  "version": "0.4.0",
   "description": "Get millions of financial documents into your AI app 🚀",
   "main": "dist/index.js",
   "module": "dist/index.esm.js",
@@ -35,8 +35,8 @@
   "homepage": "https://github.com/captide-tech/captidejs#readme",
   "peerDependencies": {
     "pdfjs-dist": "^5.2.0",
-    "react": "^19.1.0",
-    "react-dom": "^19.1.0"
+    "react": "^16.8.0",
+    "react-dom": "^16.8.0"
   },
   "devDependencies": {
     "@babel/preset-typescript": "^7.27.1",
@@ -46,8 +46,8 @@
     "@rollup/plugin-replace": "^6.0.2",
     "@rollup/plugin-typescript": "^8.5.0",
     "@types/jest": "^30.0.0",
-    "@types/react": "^19.1.8",
-    "@types/react-dom": "^19.1.6",
+    "@types/react": "^18.2.0",
+    "@types/react-dom": "^18.2.0",
     "jest": "^30.0.4",
     "rollup": "^2.74.1",
     "rollup-plugin-peer-deps-external": "^2.2.4",