fix: storefront live search relative URLs + auth error messages + TPV clock

- Storefront: use relative URLs in api.ts (fix ERR_ADDRESS_UNREACHABLE)
- Auth: show specific error for EMAIL_NOT_CONFIRMED
- TPV: add clock with date/time, modern SVG icons, panel toggle left

backlog/features.json

@@ -7744,6 +7744,38 @@
       },
       "phase": "pos",
       "completed_at": "2026-08-24T13:51:08Z"
+    },
+    {
+      "id": "SHOP-STOCK",
+      "type": "bug",
+      "title": "Storefront: Añadir al carrito respeta stock",
+      "description": "Añadir al carrito se salta restriccion de stock. Si hay 2 en stock se puede pedir 1 o 2, pero no 3.",
+      "priority": "high",
+      "risk": "low",
+      "status": "pending",
+      "created_at": "2026-08-24",
+      "gates": {
+        "reviewer": false,
+        "security": false,
+        "qa": false
+      },
+      "phase": "storefront"
+    },
+    {
+      "id": "SHOP-AUTH",
+      "type": "bug",
+      "title": "Storefront: Login register mismatch",
+      "description": "Email already registered en register pero iniciar sesion dice password incorrecto cuando es correcta.",
+      "priority": "high",
+      "risk": "low",
+      "status": "pending",
+      "created_at": "2026-08-24",
+      "gates": {
+        "reviewer": false,
+        "security": false,
+        "qa": false
+      },
+      "phase": "storefront"
     }
   ]
 }