feat(F-159): completed feature

work/artifacts/F-159/reviewer.json

@@ -0,0 +1,14 @@
+{
+  "feature_id": "F-159",
+  "agent": "reviewer",
+  "stage": "review_gate",
+  "verdict": "APPROVED",
+  "summary": "Una única jerarquía de navegación cubre collapse desktop y drawer mobile sin duplicación.",
+  "checks": [
+    {"item":"Single navigation source","ok":true,"evidence":"Sidebar maps visibleNavItems once"},
+    {"item":"Persisted desktop state","ok":true,"evidence":"localStorage key read on mount and written on toggle"},
+    {"item":"Mobile drawer","ok":true,"evidence":"fixed drawer, backdrop, route close and Escape close"},
+    {"item":"Admin build","ok":true,"evidence":"Next.js production build passed"}
+  ],
+  "issues": []
+}