feat(F-159): completed feature

work/artifacts/F-159/qa.json

@@ -0,0 +1,15 @@
+{
+  "feature_id": "F-159",
+  "agent": "qa",
+  "stage": "qa_gate",
+  "verdict": "APPROVED",
+  "summary": "Cumple persistencia, icon-only desktop, drawer mobile, transición y accesibilidad.",
+  "checks": [
+    {"item":"Desktop collapse","ok":true,"evidence":"lg width 60→20 and lg-only label hiding"},
+    {"item":"Mobile/tablet drawer","ok":true,"evidence":"fixed transform drawer plus backdrop"},
+    {"item":"Keyboard","ok":true,"evidence":"Native buttons, focus rings and Escape handler"},
+    {"item":"Persistence","ok":true,"evidence":"Stable localStorage key"},
+    {"item":"Regression","ok":true,"evidence":"Admin build, tsc and verify passed"}
+  ],
+  "issues": []
+}