build: standardise on react 19 and deduplicate deps

Eliminates dual React ecosystems and reduces dependency
duplication by consolidating on a single React version and
expanding the pnpm workspace catalog.

- Upgrade all packages from React 18 to React 19
- Remove @types/react and @types/node overrides (no longer
  needed with single React version)
- Standardise @types/node to ^22 across all packages
- Add prisma-kysely>@prisma/internals override to eliminate
  old prisma 6.16.x subtree
- Fix React 19 type changes: useRef requires initial value,
  JSX namespace needs explicit import, RefObject includes null
- Expand catalog with 14 new entries (ai, dotenv, pino,
  playwright, prisma tooling, nodemailer, pdfjs-dist, etc.)
- Catalog radix-ui, next, lucide-react, postcss, and
  typescript for docs/openpage-api alignment
- Run pnpm dedupe to collapse peer-dep context duplicates

apps/openpage-api/package.json

@@ -12,7 +12,9 @@
   "dependencies": {
     "@documenso/prisma": "workspace:*",
     "luxon": "catalog:",
-    "next": "16.1.6"
+    "next": "catalog:",
+    "react": "catalog:",
+    "react-dom": "catalog:"
   },
   "devDependencies": {
     "@types/node": "catalog:",