feat: move patient info to top header with React Context

Refactored patient display from separate ClientHeader to integrated EPDHeader.

Architecture changes:
- Implemented React Context pattern for patient data sharing
- Created PatientContext with useState + setPatient for dynamic updates
- Created useSetPatient hook for patient injection from nested layouts
- Created EPDLayoutClient wrapper with PatientProvider
- Context flow: EPDLayout → EPDLayoutClient → EPDHeader (consumer)

UI improvements:
- Removed "Mini-ECD" logo from header
- Left-aligned patient info: name + status + John Doe indicator
- Added geboortedatum (dd-mm-yyyy Dutch format)
- Added BSN extraction from FHIR identifiers
- Compact layout: Patient details | Timestamp | Actions ⋮ | Search
- Actions dropdown with "Nieuwe rapportage" (expandable)

Cleanup:
- Deleted ClientHeader component (141 lines duplicate code)
- Simplified PatientLayoutClient (only useSetPatient hook)
- Single source of truth for patient display

Result: Clean context-based architecture, improved UX, -141 LOC

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

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

app/epd/components/patient-context.tsx

@@ -0,0 +1,38 @@
+'use client';
+
+import { createContext, useContext, useState, useEffect } from 'react';
+import type { FHIRPatient } from '@/lib/fhir';
+
+interface PatientContextValue {
+  patient: FHIRPatient | null;
+  setPatient: (patient: FHIRPatient | null) => void;
+}
+
+const PatientContext = createContext<PatientContextValue>({
+  patient: null,
+  setPatient: () => {},
+});
+
+export function usePatientContext() {
+  return useContext(PatientContext);
+}
+
+export function PatientProvider({ children }: { children: React.ReactNode }) {
+  const [patient, setPatient] = useState<FHIRPatient | null>(null);
+
+  return (
+    <PatientContext.Provider value={{ patient, setPatient }}>
+      {children}
+    </PatientContext.Provider>
+  );
+}
+
+// Hook to inject patient data into context from nested layouts
+export function useSetPatient(patient: FHIRPatient | null) {
+  const { setPatient } = usePatientContext();
+
+  useEffect(() => {
+    setPatient(patient);
+    return () => setPatient(null); // Cleanup when unmounting
+  }, [patient, setPatient]);
+}