feat(desktop): P16 HUD 顶部窄信息条（时段/时间/倍速/体力/钱币）+ 冬夜冷色 + 面板/提示渐变重绘

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diff --git a/src/LivingVillage.Desktop/HudLayout.fs b/src/LivingVillage.Desktop/HudLayout.fs
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+namespace LivingVillage.Desktop
+
+open Microsoft.Xna.Framework
+open LivingVillage.Kernel
+open LivingVillage.Kernel.Sim
+
+/// 顶部窄信息条 HUD 的纯布局/配色模型：只做确定性计算，实际绘制在 Game.fs。
+/// 常驻状态（时段/时间/倍速/体力/钱币）压进一条窄带，绝不用整屏纯色或大黑块。
+module HudLayout =
+
+    let barHeight = 36
+    let accentHeight = 3
+    let paddingX = 16
+    let segmentGap = 20
+    let textScale = 2
+
+    type Segment =
+        { Label: string
+          Value: string }
+
+    let segmentText (segment: Segment) : string = sprintf "%s %s" segment.Label segment.Value
+
+    /// 常驻状态片段，数值全部取自世界真实状态，绝不编造。
+    let segments (world: World) (control: SimulationControl) : Segment list =
+        let needs = world.Avatar.Mind.Needs
+        [ { Label = "时段"; Value = M6Presentation.timePeriodLabel world.Tick }
+          { Label = "时间"; Value = M6Presentation.clockTimeLabel world.Tick }
+          { Label = "倍速"; Value = M6Presentation.speedLabel control }
+          { Label = "体力"; Value = sprintf "%.0f" needs.Energy }
+          { Label = "钱币"; Value = sprintf "%.0f" needs.Money } ]
+
+    /// 段文本（含标签）的像素宽度。
+    let segmentWidth (segment: Segment) : int =
+        FloatingPrompt.measureWidth (segmentText segment) textScale
+
+    /// 左对齐排布，返回 (起点 x, 宽度, 分段)；纯函数，便于布局回归断言。
+    let layout (segments: Segment list) : (int * int * Segment) list =
+        let _, placed =
+            segments
+            |> List.fold
+                (fun (x, acc) segment ->
+                    let width = segmentWidth segment
+                    x + width + segmentGap, (x, width, segment) :: acc)
+                (paddingX, [])
+        List.rev placed
+
+    type Palette =
+        { BarTop: Color
+          BarBottom: Color
+          Accent: Color
+          Label: Color
+          Value: Color }
+
+    /// 白天暖色 / 夜晚（冬夜）冷色微调；均为半透明渐变窄条，无大黑块。
+    let palette (mode: M6DayNight) : Palette =
+        match mode with
+        | Day ->
+            { BarTop = Color(40, 56, 62, 200)
+              BarBottom = Color(22, 34, 40, 200)
+              Accent = Color(212, 168, 96)
+              Label = Color(206, 220, 208)
+              Value = Color(242, 248, 234) }
+        | Night ->
+            { BarTop = Color(22, 30, 48, 205)
+              BarBottom = Color(13, 19, 33, 205)
+              Accent = Color(120, 168, 196)
+              Label = Color(176, 196, 214)
+              Value = Color(228, 238, 246) }