Things were working, suddenly regressed

SVSim.EmulatedEntrypoint/Models/Dtos/ShopNotification.cs

@@ -0,0 +1,51 @@
+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos;
+
+/// <summary>
+/// shop_notification on /mypage/index, consumed by
+/// ShopNotification.SetShopNotification (Wizard/ShopNotification.cs:30). All four
+/// sub-keys are directly indexed; each is passed to ShopAppealInfo, which early-
+/// returns when `data.Count == 0`. We mirror prod's heterogeneous shape — three
+/// empty arrays and one object — so that the wire matches and the client's
+/// length-check fires on the empty cases.
+/// </summary>
+[MessagePackObject]
+public class ShopNotification
+{
+    [JsonPropertyName("card_pack")]
+    [Key("card_pack")]
+    public ShopCardPackAppeal CardPack { get; set; } = new();
+
+    /// <summary>Prod 2026-05-23: <c>[]</c>. Client treats Count==0 as "no notification".</summary>
+    [JsonPropertyName("build_deck")]
+    [Key("build_deck")]
+    public List<object> BuildDeck { get; set; } = new();
+
+    /// <summary>Prod 2026-05-23: <c>[]</c>.</summary>
+    [JsonPropertyName("sleeve")]
+    [Key("sleeve")]
+    public List<object> Sleeve { get; set; } = new();
+
+    /// <summary>Prod 2026-05-23: <c>[]</c>.</summary>
+    [JsonPropertyName("leader_skin")]
+    [Key("leader_skin")]
+    public List<object> LeaderSkin { get; set; } = new();
+}
+
+/// <summary>
+/// card_pack sub-object — drives the free-gacha campaign badge. Both fields are
+/// TryGetValue on the client; emitting both as false matches prod's idle shape.
+/// </summary>
+[MessagePackObject]
+public class ShopCardPackAppeal
+{
+    [JsonPropertyName("is_open_free_gacha_campaign")]
+    [Key("is_open_free_gacha_campaign")]
+    public bool IsOpenFreeGachaCampaign { get; set; }
+
+    [JsonPropertyName("can_free_gacha")]
+    [Key("can_free_gacha")]
+    public bool CanFreeGacha { get; set; }
+}