dependencies: Update React, React DOM, and related packages to version 19; upgrade lucide-react and next-themes

package.json

@@ -38,16 +38,16 @@
     "html-to-text": "^9.0.5",
     "jsdom": "^26.1.0",
     "langchain": "^0.3.26",
-    "lucide-react": "^0.363.0",
+    "lucide-react": "^0.525.0",
     "markdown-to-jsx": "^7.7.2",
     "next": "^15.2.2",
-    "next-themes": "^0.3.0",
+    "next-themes": "^0.4.6",
     "pdf-parse": "^1.1.1",
     "playwright": "^1.52.0",
-    "react": "^18",
-    "react-dom": "^18",
+    "react": "^19",
+    "react-dom": "^19",
     "react-syntax-highlighter": "^15.6.1",
-    "react-text-to-speech": "^0.14.5",
+    "react-text-to-speech": "^2.1.2",
     "react-textarea-autosize": "^8.5.3",
     "sonner": "^1.4.41",
     "tailwind-merge": "^2.2.2",
@@ -61,8 +61,8 @@
     "@types/jsdom": "^21.1.7",
     "@types/node": "^20",
     "@types/pdf-parse": "^1.1.4",
-    "@types/react": "^18",
-    "@types/react-dom": "^18",
+    "@types/react": "^19",
+    "@types/react-dom": "^19",
     "autoprefixer": "^10.0.1",
     "drizzle-kit": "^0.30.5",
     "eslint": "^8",