feat(desktop): 村民五套服饰帽饰区分

人物图集扩至五套变体（1280x48）：靛蓝袍配布巾、褐衫配发髻马甲、翠衫配发簪红巾、灰袍配瓜皮帽，主角专属斗笠独立第五套；村民按 id 取模四种服饰轮转，永不与主角同装，四向两帧动画保持。

1 files changed, 18 insertions, 0 deletions

diff --git a/src/LivingVillage.Desktop.Tests/PrototypeTests.fs b/src/LivingVillage.Desktop.Tests/PrototypeTests.fs
index 4d698ad..3e15272 100644
--- a/src/LivingVillage.Desktop.Tests/PrototypeTests.fs
+++ b/src/LivingVillage.Desktop.Tests/PrototypeTests.fs
@@ -223,6 +223,24 @@ type PrototypeTests () =
         Assert.AreEqual<AnimationFrame>(FrameOne, (VillageArt.animationFrame 8L))
 
     [<TestMethod>]
+    member _.VillagersUseFourDistinctVariantsDistinctFromTheAvatar () =
+        let npcVariants = [ 0 .. 63 ] |> List.map (fun id -> npcVisualVariant (NpcId id)) |> Set.ofList
+
+        Assert.AreEqual<int>(4, npcVariants.Count)
+        Assert.IsFalse(npcVariants.Contains StrawHat)
+        Assert.AreEqual<NpcVisualVariant>(StrawHat, (avatarSpriteSpec SouthFacing 0L).Variant)
+
+        let variantXes =
+            npcVariants
+            |> Set.toList
+            |> List.map (fun variant ->
+                let rect = characterSourceRectangle { Variant = variant; Direction = SouthFacing; Frame = FrameOne }
+                rect.X)
+            |> Set.ofList
+        Assert.AreEqual<int>(4, variantXes.Count)
+        Assert.AreEqual<int>(1280, VillageArt.characterAtlasWidth)
+
+    [<TestMethod>]
     member _.ChineseCopyProvidesFormalSceneTimeMenuAndStatusLabels () =
         let labels =
             [ sceneLabel VillageScene