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-block-data.ts

@@ -0,0 +1,123 @@
+'use client';
+
+/**
+ * useBlockData Hook
+ *
+ * Generic data fetching hook for Cortex blocks.
+ * Handles loading, error states, and provides refetch capability.
+ *
+ * Epic: E2.S1 - Custom Hooks
+ */
+
+import { useState, useEffect, useCallback } from 'react';
+import { useToast } from '@/hooks/use-toast';
+import { safeFetch, getErrorInfo } from '@/lib/cortex/error-handler';
+
+// ============================================================================
+// Types
+// ============================================================================
+
+interface UseBlockDataOptions<T> {
+  /** API endpoint (relatief pad) */
+  endpoint: string;
+  /** Query parameters */
+  params?: Record<string, string | undefined>;
+  /** Of data moet worden opgehaald */
+  enabled?: boolean;
+  /** Callback bij error */
+  onError?: (error: Error) => void;
+  /** Operatie naam voor error messages */
+  operationName?: string;
+}
+
+interface UseBlockDataResult<T> {
+  /** Opgehaalde data */
+  data: T | null;
+  /** Loading state */
+  isLoading: boolean;
+  /** Error message */
+  error: string | null;
+  /** Refetch functie */
+  refetch: () => Promise<void>;
+}
+
+// ============================================================================
+// Hook
+// ============================================================================
+
+/**
+ * Generic data fetching hook for Cortex blocks.
+ *
+ * @example
+ * const { data, isLoading, error, refetch } = useBlockData<RiskData>({
+ *   endpoint: `/api/cortex/intake/${intakeId}/risks`,
+ *   enabled: Boolean(intakeId),
+ *   operationName: 'Risico\'s laden',
+ * });
+ */
+export function useBlockData<T>({
+  endpoint,
+  params,
+  enabled = true,
+  onError,
+  operationName = 'Data laden',
+}: UseBlockDataOptions<T>): UseBlockDataResult<T> {
+  const [data, setData] = useState<T | null>(null);
+  const [isLoading, setIsLoading] = useState(enabled);
+  const [error, setError] = useState<string | null>(null);
+  const { toast } = useToast();
+
+  // Stringify params for dependency comparison
+  const paramsKey = params ? JSON.stringify(params) : '';
+
+  const fetchData = useCallback(async () => {
+    if (!enabled) return;
+
+    setIsLoading(true);
+    setError(null);
+
+    try {
+      // Build URL with params
+      const url = new URL(endpoint, window.location.origin);
+      if (params) {
+        Object.entries(params).forEach(([key, value]) => {
+          if (value !== undefined) {
+            url.searchParams.set(key, value);
+          }
+        });
+      }
+
+      const response = await safeFetch(url.toString(), undefined, {
+        operation: operationName,
+      });
+
+      const result = await response.json();
+      setData(result);
+    } catch (err) {
+      const statusCode = (err as any)?.statusCode;
+      const errorInfo = getErrorInfo(err, {
+        operation: operationName,
+        statusCode,
+      });
+
+      setError(errorInfo.description);
+      onError?.(err as Error);
+
+      toast({
+        variant: 'destructive',
+        title: errorInfo.title,
+        description: errorInfo.description,
+      });
+    } finally {
+      setIsLoading(false);
+    }
+  }, [endpoint, paramsKey, enabled, onError, operationName, toast]);
+
+  useEffect(() => {
+    if (enabled) {
+      fetchData();
+    }
+  }, [fetchData, enabled]);
+
+  return { data, isLoading, error, refetch: fetchData };
+}