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>

tests/Decentralized.Domain.Tests/Program.cs

@@ -808,6 +808,27 @@ internal static class Program
             Check(!ChainAddress.Valid("0x12345") && !ChainAddress.Valid("0xzzzzzzzz") && !ChainAddress.WellFormed("12345678ab"), "格式不对的地址不合法");
         });
 
+        Test("相似地址、手续费、确认数", () =>
+        {
+            var rng = new Rng(21);
+            int sameShort = 0;
+            for (int i = 0; i < 300; i++)
+            {
+                string a = ChainAddress.Make(rng.NextUInt());
+                string f = ChainAddress.Lookalike(a, rng);
+                Check(ChainAddress.Valid(f) && !ChainAddress.Same(a, f) && f.Substring(0, 5) == a.Substring(0, 5), $"相似地址合法、不同、前缀相同：{a} / {f}");
+                if (ChainAddress.Short(a) == ChainAddress.Short(f)) sameShort++;
+            }
+            Check(sameShort > 290, $"缩写看起来一样：{sameShort}/300");
+            Check(TxRules.FeeCredits(FeeTier.Slow, false) < TxRules.FeeCredits(FeeTier.Normal, false) && TxRules.FeeCredits(FeeTier.Normal, false) < TxRules.FeeCredits(FeeTier.Fast, false), "慢 < 普通 < 快");
+            Check(Math.Abs(TxRules.FeeCredits(FeeTier.Fast, true) - Tuning.TxFeeFast * Tuning.TxCongestedFeeMult) < 1e-9, "拥堵时手续费翻倍");
+            Check(TxRules.Confirmations(100) == 3 && TxRules.Confirmations(5000) == 6 && TxRules.Confirmations(50000) == 12, "大额要更多确认");
+            Check(TxRules.DropChance(FeeTier.Slow, true) > 0 && TxRules.DropChance(FeeTier.Slow, false) == 0 && TxRules.DropChance(FeeTier.Fast, true) == 0, "只有拥堵时的慢档会被丢");
+            var h = new List<TxRecord>();
+            for (int i = 0; i < 30; i++) TxRules.Record(h, new TxRecord { Day = i });
+            Check(h.Count == TxRules.HistoryMax && h[0].Day == 29, "记录最新在前、有上限");
+        });
+
         Test("被投毒的钱包：门槛以下不转，越多越快，转空", () =>
         {
             Check(Wallet.DrainChance(Tuning.WalletDrainMin - 1) == 0, "门槛以下不会被转走");