refactor(admin): split controls, training, control-provenance, iace/verification pages

Each page.tsx exceeded the 500-LOC hard cap. Extracted components and hooks into
colocated _components/ and _hooks/ directories; page.tsx is now a thin orchestrator.

- controls/page.tsx: 944 → 180 LOC; extracted ControlCard, AddControlForm,
  LoadingSkeleton, TransitionErrorBanner, StatsCards, FilterBar, RAGPanel into
  _components/ and useControlsData, useRAGSuggestions into _hooks/; types into _types.ts
- training/page.tsx: 780 → 288 LOC; extracted ContentTab (inline content generator tab)
  into _components/ContentTab.tsx
- control-provenance/page.tsx: 739 → 122 LOC; extracted MarkdownRenderer, UsageBadge,
  PermBadge, LicenseMatrix, SourceRegistry into _components/; PROVENANCE_SECTIONS
  static data into _data/provenance-sections.ts
- iace/[projectId]/verification/page.tsx: 673 → 196 LOC; extracted StatusBadge,
  VerificationForm, CompleteModal, SuggestEvidenceModal, VerificationTable into _components/

Zero behavior changes; logic relocated verbatim.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

admin-compliance/app/sdk/controls/_components/TransitionErrorBanner.tsx

@@ -0,0 +1,40 @@
+export function TransitionErrorBanner({
+  controlId,
+  violations,
+  onDismiss,
+}: {
+  controlId: string
+  violations: string[]
+  onDismiss: () => void
+}) {
+  return (
+    <div className="p-4 bg-orange-50 border border-orange-200 rounded-lg">
+      <div className="flex items-start justify-between">
+        <div className="flex items-start gap-3">
+          <svg className="w-5 h-5 text-orange-600 mt-0.5 flex-shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z" />
+          </svg>
+          <div>
+            <h4 className="font-medium text-orange-800">Status-Transition blockiert ({controlId})</h4>
+            <ul className="mt-2 space-y-1">
+              {violations.map((v, i) => (
+                <li key={i} className="text-sm text-orange-700 flex items-start gap-2">
+                  <span className="text-orange-400 mt-0.5">•</span>
+                  <span>{v}</span>
+                </li>
+              ))}
+            </ul>
+            <a href="/sdk/evidence" className="mt-2 inline-block text-sm text-purple-600 hover:text-purple-700 font-medium">
+              Evidence hinzufuegen →
+            </a>
+          </div>
+        </div>
+        <button onClick={onDismiss} className="text-orange-400 hover:text-orange-600 ml-4">
+          <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
+          </svg>
+        </button>
+      </div>
+    </div>
+  )
+}