fix(deps): update react monorepo to v19

Author: renovate[bot]

package.json

@@ -21,8 +21,8 @@
     "@tailwindcss/typography": "0.5.15",
     "astro": "2.10.15",
     "mdast-util-to-string": "3.2.0",
-    "react": "18.3.1",
-    "react-dom": "18.3.1",
+    "react": "19.0.0",
+    "react-dom": "19.0.0",
     "reading-time": "1.5.0",
     "rollup": "3.29.5",
     "shiki": "0.14.7",