Wallets: expected-days drain, copy/paste, three-column selectable balances, rename and destroy

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/Decentralized.Domain/Wallet.cs

@@ -18,19 +18,23 @@ namespace Decentralized.Domain
         public double Basis;
         /// <summary>被执法标记。</summary>
         public bool Flagged;
-        /// <summary>显示名（终端钱包页、硬件钱包标题）。</summary>
+        /// <summary>钱包编号（"钱包 n"），添加时定下，销毁别的钱包也不变。</summary>
         public string Name;
+        /// <summary>玩家起的名字；空时用默认名。</summary>
+        public string Label;
         /// <summary>硬件钱包被动过手脚（供应链投毒）：别人手里有助记词。玩家看不到。</summary>
         public bool Poisoned;
 
-        /// <summary>被投毒的钱包今晚被转空的概率：总价值不到门槛时为 0，越多越高（1–7 天）。</summary>
-        public static double DrainChance(double value)
+        /// <summary>被投毒的钱包被转空前的期望天数：门槛处 7 天，按价值线性降到满额处 1 天；不到门槛不会被转。</summary>
+        public static double DrainDays(double value)
         {
-            if (value < Tuning.WalletDrainMin) return 0;
-            double slow = 1 / Tuning.WalletDrainSlowDays, t = Math.Min(1, (value - Tuning.WalletDrainMin) / (Tuning.WalletDrainFull - Tuning.WalletDrainMin));
-            return slow + (1 - slow) * t;
+            double t = Math.Min(1, (value - Tuning.WalletDrainMin) / (Tuning.WalletDrainFull - Tuning.WalletDrainMin));
+            return Tuning.WalletDrainSlowDays - (Tuning.WalletDrainSlowDays - 1) * t;
         }
 
+        /// <summary>被投毒的钱包今晚被转空的概率 = 1 / 期望天数（每晚独立掷一次）。</summary>
+        public static double DrainChance(double value) => value < Tuning.WalletDrainMin ? 0 : 1 / DrainDays(value);
+
         /// <summary>转空：全部余额（含冻结的）连同污点、成本一起转走，返回转走的价值（信用点）。</summary>
         public double Drain(Func<string, double> price)
         {