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>

components/cortex/shared/block-states.tsx

@@ -0,0 +1,136 @@
+'use client';
+
+/**
+ * Block State Components
+ *
+ * Reusable state components for Cortex blocks:
+ * - BlockLoading: Loading spinner with message
+ * - BlockError: Error state with retry option
+ * - BlockEmpty: Empty state with action option
+ *
+ * Epic: E0 - Block States
+ */
+
+import { Loader2, AlertCircle, RefreshCw } from 'lucide-react';
+import type { LucideIcon } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { cn } from '@/lib/utils';
+
+// ============================================================================
+// BlockLoading (E0.S1)
+// ============================================================================
+
+interface BlockLoadingProps {
+  /** Tekst onder de spinner */
+  message?: string;
+  /** Extra CSS classes */
+  className?: string;
+}
+
+/**
+ * Loading state for Cortex blocks.
+ * Shows centered spinner with optional message.
+ */
+export function BlockLoading({
+  message = 'Laden...',
+  className,
+}: BlockLoadingProps) {
+  return (
+    <div
+      className={cn(
+        'flex flex-col items-center justify-center py-12',
+        className
+      )}
+    >
+      <Loader2 className="h-6 w-6 animate-spin text-slate-400 mb-2" />
+      <span className="text-sm text-slate-500">{message}</span>
+    </div>
+  );
+}
+
+// ============================================================================
+// BlockError (E0.S2)
+// ============================================================================
+
+interface BlockErrorProps {
+  /** Foutmelding tekst */
+  message: string;
+  /** Callback voor retry knop (toont knop indien aanwezig) */
+  onRetry?: () => void;
+  /** Extra CSS classes */
+  className?: string;
+}
+
+/**
+ * Error state for Cortex blocks.
+ * Shows error icon, message, and optional retry button.
+ */
+export function BlockError({
+  message,
+  onRetry,
+  className,
+}: BlockErrorProps) {
+  return (
+    <div
+      className={cn(
+        'flex flex-col items-center justify-center py-8 text-center',
+        className
+      )}
+    >
+      <AlertCircle className="h-8 w-8 text-red-500 mb-2" />
+      <p className="text-sm text-red-700 mb-3 max-w-xs">{message}</p>
+      {onRetry && (
+        <Button variant="outline" size="sm" onClick={onRetry}>
+          <RefreshCw className="h-4 w-4 mr-1.5" />
+          Opnieuw proberen
+        </Button>
+      )}
+    </div>
+  );
+}
+
+// ============================================================================
+// BlockEmpty (E0.S3)
+// ============================================================================
+
+interface BlockEmptyProps {
+  /** Icoon component */
+  icon: LucideIcon;
+  /** Hoofdboodschap */
+  message: string;
+  /** Optionele actie knop */
+  action?: {
+    label: string;
+    onClick: () => void;
+  };
+  /** Extra CSS classes */
+  className?: string;
+}
+
+/**
+ * Empty state for Cortex blocks.
+ * Shows icon, message, and optional action button.
+ */
+export function BlockEmpty({
+  icon: Icon,
+  message,
+  action,
+  className,
+}: BlockEmptyProps) {
+  return (
+    <div
+      className={cn(
+        'flex flex-col items-center justify-center py-8 text-center',
+        className
+      )}
+    >
+      <Icon className="h-8 w-8 text-slate-300 mb-2" />
+      <p className="text-sm text-slate-500 mb-3">{message}</p>
+      {action && (
+        <Button variant="outline" size="sm" onClick={action.onClick}>
+          {action.label}
+        </Button>
+      )}
+    </div>
+  );
+}