feat(cortex): add Intake Blocks MVP for voice/text commands

Adds 4 new intents for intake workflow:
- intake_status: shows completion percentage and section checklist
- intake_navigeer: navigation to specific intake tabs
- risico_query: displays risk assessments with severity indicators
- diagnose_query: shows primary/secondary diagnoses

New components:
- IntakeStatusBlock, RisicoBlock, DiagnoseBlock
- Shared block components (BlockLoading, BlockError, BlockEmpty, BlockSection, BlockItem, BlockFooter)
- useBlockData and useIntakeContext hooks

New API routes:
- GET /api/cortex/intake/status
- GET /api/cortex/intake/risico
- GET /api/cortex/intake/diagnose

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lib/cortex/hooks/use-intake-context.ts

@@ -0,0 +1,85 @@
+'use client';
+
+/**
+ * useIntakeContext Hook
+ *
+ * Provides patient and intake context for Cortex blocks.
+ * Falls back to activePatient from store when prefill is not provided.
+ *
+ * Epic: E2.S2 - Custom Hooks
+ */
+
+import { useMemo } from 'react';
+import { useCortexStore } from '@/stores/cortex-store';
+import type { BlockPrefillData } from '@/stores/cortex-store';
+import { formatPatientName } from '@/lib/fhir/patient-mapper';
+
+// ============================================================================
+// Types
+// ============================================================================
+
+/**
+ * Extended prefill data with intake-specific fields.
+ * Blocks can pass this to get intake context.
+ */
+export interface IntakePrefillData extends BlockPrefillData {
+  /** Intake ID for intake-specific operations */
+  intakeId?: string;
+}
+
+interface UseIntakeContextResult {
+  /** Patient ID (van prefill of activePatient) */
+  patientId: string | null;
+  /** Intake ID (van prefill) */
+  intakeId: string | null;
+  /** Patient naam (voor display) */
+  patientName: string | null;
+  /** Of er patient context is */
+  hasPatientContext: boolean;
+  /** Of er intake context is */
+  hasIntakeContext: boolean;
+}
+
+// ============================================================================
+// Hook
+// ============================================================================
+
+/**
+ * Hook for getting patient and intake context in Cortex blocks.
+ *
+ * Priority:
+ * 1. Explicit prefill data (from intent classification)
+ * 2. activePatient from store (fallback)
+ *
+ * @example
+ * const { patientId, intakeId, hasPatientContext } = useIntakeContext(prefill);
+ *
+ * if (!hasPatientContext) {
+ *   return <BlockEmpty icon={User} message="Selecteer eerst een patiënt" />;
+ * }
+ */
+export function useIntakeContext(
+  prefill?: IntakePrefillData
+): UseIntakeContextResult {
+  const { activePatient } = useCortexStore();
+
+  return useMemo(() => {
+    // Patient context: prefill takes priority, then activePatient
+    const patientId = prefill?.patientId || activePatient?.id || null;
+    const patientName =
+      prefill?.patientName ||
+      (activePatient ? formatPatientName(activePatient) : null);
+
+    // Intake context: only from prefill for now
+    // TODO: Add activeIntake to cortex-store for persistent intake context
+    const intakeId = prefill?.intakeId || null;
+
+    return {
+      patientId,
+      intakeId,
+      patientName,
+      hasPatientContext: Boolean(patientId),
+      hasIntakeContext: Boolean(intakeId),
+    };
+  }, [prefill, activePatient]);
+}