feat: enhance EPD header with dynamic client data fetching

- Update EPD header to fetch and display real client data from database
- Add loading state while fetching client information
- Improve client name and birth date formatting
- Rename ClientDetailPage component to ClientRedirect for clarity
- Fix import path for ReleaseSidebar in documentation layout

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/epd/clients/[id]/page.tsx

@@ -10,7 +10,7 @@ interface ClientDetailPageProps {
  * Wanneer een gebruiker direct naar /epd/clients/[id] navigeert,
  * wordt deze automatisch doorgestuurd naar het dashboard.
  */
-export default async function ClientDetailPage({
+export default async function ClientRedirect({
   params,
 }: ClientDetailPageProps) {
   const { id } = await params;