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

packages/ui/components/signing-card.tsx

@@ -48,7 +48,7 @@ export const SigningCard3D = ({
 
   const [trackMouse, setTrackMouse] = useState(false);
 
-  const timeoutRef = useRef<number | undefined>();
+  const timeoutRef = useRef<number | undefined>(undefined);
 
   const cardX = useMotionValue(0);
   const cardY = useMotionValue(0);
@@ -184,7 +184,7 @@ const SigningCardContent = ({ className, name, signature }: SigningCardContentPr
           ))
           .with({ typedSignature: P.string }, (signature) => (
             <span
-              className="text-muted-foreground/60 group-hover:text-primary/80 break-all font-semibold duration-300"
+              className="text-muted-foreground/60 group-hover:text-primary/80 font-semibold break-all duration-300"
               style={{
                 fontSize: `max(min(4rem, ${(100 / signature.typedSignature.length / 2).toFixed(
                   4,
@@ -196,7 +196,7 @@ const SigningCardContent = ({ className, name, signature }: SigningCardContentPr
           ))
           .otherwise(() => (
             <span
-              className="text-muted-foreground/60 group-hover:text-primary/80 break-all font-semibold duration-300"
+              className="text-muted-foreground/60 group-hover:text-primary/80 font-semibold break-all duration-300"
               style={{
                 fontSize: `max(min(4rem, ${(100 / name.length / 2).toFixed(4)}cqw), 1.875rem)`,
               }}