Chain drama: fee tiers, congestion, mempool drops, address poisoning, clipboard hijack, phishing; selected-button style

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

src/Decentralized.Domain/TxRules.cs

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+using System.Collections.Generic;
+
+namespace Decentralized.Domain
+{
+    /// <summary>钱包里的一条转账记录：对方地址、币种、数量、哪天、转入还是转出。地址投毒的 0 币转入也记在这里。</summary>
+    public sealed class TxRecord
+    {
+        public string Addr, Asset;
+        public double Amount;
+        public int Day;
+        public bool In;
+    }
+
+    /// <summary>手续费档位：慢最便宜，网络拥堵时可能被挤出内存池；快最贵，拥堵时也照常确认。</summary>
+    public enum FeeTier { Slow, Normal, Fast }
+
+    /// <summary>链上转账的规则：手续费、需要的确认数、拥堵时慢档被丢弃的概率。</summary>
+    public static class TxRules
+    {
+        /// <summary>手续费（信用点等值，按转出的币扣）：档位基础价 × 拥堵倍数。</summary>
+        public static double FeeCredits(FeeTier t, bool congested) =>
+            (t == FeeTier.Slow ? Tuning.TxFeeSlow : t == FeeTier.Normal ? Tuning.TxFeeNormal : Tuning.TxFeeFast) * (congested ? Tuning.TxCongestedFeeMult : 1);
+
+        /// <summary>需要的确认数：金额越大越多。</summary>
+        public static int Confirmations(double valueCredits) =>
+            valueCredits >= Tuning.TxConfirmBigValue ? Tuning.TxConfirmBig : valueCredits >= Tuning.TxConfirmMidValue ? Tuning.TxConfirmMid : Tuning.TxConfirmBase;
+
+        /// <summary>每次确认的间隔倍数：拥堵时慢档、普通档变慢。</summary>
+        public static double Slowdown(FeeTier t, bool congested) => !congested ? 1 : t == FeeTier.Fast ? 1 : t == FeeTier.Normal ? Tuning.TxCongestedNormalSlow : Tuning.TxCongestedSlowSlow;
+
+        /// <summary>拥堵时慢档交易被挤出内存池的概率（交易作废，手续费照扣）。</summary>
+        public static double DropChance(FeeTier t, bool congested) => congested && t == FeeTier.Slow ? Tuning.TxSlowDrop : 0;
+
+        /// <summary>转账记录最多保留几条。</summary>
+        public const int HistoryMax = 20;
+
+        public static void Record(List<TxRecord> history, TxRecord r)
+        {
+            history.Insert(0, r);
+            if (history.Count > HistoryMax) history.RemoveRange(HistoryMax, history.Count - HistoryMax);
+        }
+    }
+}