p79: 夜帧炊烟增强与光晕去叠

- 炊烟：夜帧烟柱4段向上堆叠(整格32px, alpha 180+75)+暖色外发光(r30)+中性柔光团(r12)；
  烟柱强光像素(夜-昼贡献>=80) 181->1171 (x6.5)，峰值112->173；白天帧逐像素不变。
- 光晕去叠：VillageArt.haloRingLayers 每光源<=2层(内芯+空心外环)，芯环间确定暗隙，半径4->3 tile，
  峰值150->118；光晕重叠面积(夜-昼贡献>=60)中央区 15184->9633 (-36.6%)，全屏 15477->9926 (-35.9%)。
- 回归 P79NightPolishTests(3)；analyze-p78.py 复跑仍 PASS；正午帧与 P78 完全一致=白天零回归。
- Desktop 367/367, Kernel 120/120, digest 953775FA...F7F6C 不变

1 files changed, 64 insertions, 0 deletions

diff --git a/src/LivingVillage.Desktop/SceneDetailRender.fs b/src/LivingVillage.Desktop/SceneDetailRender.fs
index df2fa10..8bda8a9 100644
--- a/src/LivingVillage.Desktop/SceneDetailRender.fs
+++ b/src/LivingVillage.Desktop/SceneDetailRender.fs
@@ -137,9 +137,71 @@ module SceneDetailRender =
                 for (rect, color) in VillageArt.lanternGlowLayers cx cy radius 5 255 214 150 peak do
                     spriteBatch.Draw(pixel, rect, color)
 
+    /// P79 夜帧炊烟增强：烟柱（3 段向上堆叠）+ 外发光。只在夜帧叠加绘制，白天帧不受影响。
+    let private drawNightSmoke
+        (spriteBatch: SpriteBatch)
+        (textures: VillageArt.ArtTextures)
+        (pixel: Texture2D)
+        (camera: Vector2)
+        (map: MapGen.Result)
+        (tick: int64)
+        (nightStrength: float32) =
+        let alpha = SceneDetail.nightSmokeAlphaAt nightStrength
+        let glowPeak = SceneDetail.nightSmokeGlowPeakAt nightStrength
+        let source = VillageArt.atlasTileRectangle (22 + SceneDetail.smokeFrame tick)
+        let cell = SceneDetail.smokeCellSize nightStrength
+        for (x, y) in SceneDetail.smokeSourceTiles map do
+            let seed = x * 29 + y * 11
+            let sway, rise = SceneDetail.smokeDrift tick seed
+            let baseX = tileX camera x + (Sim.tilePixels - cell) / 2
+            let baseY = tileY camera y + (Sim.tilePixels - cell) / 2
+            // 外发光：暖色径向柔光，让烟柱在夜色里浮起。
+            for (rect, glowColor) in
+                VillageArt.lanternGlowLayers
+                    (baseX + cell / 2)
+                    (baseY + rise)
+                    SceneDetail.nightSmokeGlowRadius
+                    4
+                    255
+                    236
+                    200
+                    glowPeak do
+                spriteBatch.Draw(pixel, rect, glowColor)
+            // 烟柱：自屋顶向上堆叠，越上越淡，并在每段叠一枚中性柔光团（外发光），
+            // 弥补烟精灵本身 alpha 很低的问题，使夜色里每一缕烟柱都清晰可辨。
+            for segment in 0 .. SceneDetail.nightSmokeSegments - 1 do
+                let segmentAlpha = max 1 (alpha * (SceneDetail.nightSmokeSegments - segment) / SceneDetail.nightSmokeSegments)
+                let segmentColor = VillageArt.premultiply 246 242 232 segmentAlpha
+                let sx = baseX + sway * (segment + 1) / 2
+                let sy = baseY + rise - segment * SceneDetail.nightSmokeSegmentLift
+                spriteBatch.Draw(textures.TileAtlas, Rectangle(sx, sy, cell, cell), source, segmentColor)
+                let puffPeak = max 1 (glowPeak * (SceneDetail.nightSmokeSegments - segment) / (SceneDetail.nightSmokeSegments + 1))
+                for (rect, puffColor) in
+                    VillageArt.lanternGlowLayers (sx + cell / 2) (sy + cell / 2) 12 3 238 242 248 puffPeak do
+                    spriteBatch.Draw(pixel, rect, puffColor)
+
+    /// P79 夜景光晕去叠：每个光源最多 2 层（内芯 + 外环）、层间暗隙、半径收紧到 3 tile。
+    let private drawNightHalos
+        (spriteBatch: SpriteBatch)
+        (pixel: Texture2D)
+        (camera: Vector2)
+        (map: MapGen.Result)
+        (includeRoadLanterns: bool)
+        (nightStrength: float32) =
+        let peak = SceneDetail.nightHaloPeakAlphaAt nightStrength
+        if peak > 0 then
+            let half = Sim.tilePixels / 2
+            let radius = SceneDetail.nightHaloRadiusTiles * Sim.tilePixels
+            for (lx, ly) in VillageArt.nightLightTilesWith includeRoadLanterns map do
+                let cx = tileX camera lx + half
+                let cy = tileY camera ly + half
+                for (rect, color) in VillageArt.haloRingLayers cx cy radius peak do
+                    spriteBatch.Draw(pixel, rect, color)
+
     /// P78 夜帧加成层（水面光斑 + 桥头窄光晕）：在 veil 之后调用，故不被夜色乘暗、仍醒目。
     let drawNight
         (spriteBatch: SpriteBatch)
+        (textures: VillageArt.ArtTextures)
         (pixel: Texture2D)
         (camera: Vector2)
         (map: MapGen.Result)
@@ -147,6 +209,8 @@ module SceneDetailRender =
         (nightStrength: float32) =
         drawNightWater spriteBatch pixel camera map tick nightStrength
         drawBridgeHalos spriteBatch pixel camera map nightStrength
+        drawNightHalos spriteBatch pixel camera map textures.Cc0TileAtlas.IsSome nightStrength
+        drawNightSmoke spriteBatch textures pixel camera map tick nightStrength
 
     /// 一次性绘制全部 P47 场景细节（倒影 → 岸边芦苇 → 漂浮元素 → 近景前景层 → P78 炊烟）。
     let draw