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/Session.cs

@@ -37,9 +37,12 @@ namespace Decentralized
 
         public Wallet Own(string address) => Wallets.Find(w => ChainAddress.Same(w.Address, address));
 
+        /// <summary>钱包编号：每添加一个加一，销毁后不回收，名字不会错位。</summary>
+        public int WalletSeq;
+
         public Wallet AddWallet(bool poisoned)
         {
-            var w = new Wallet { Address = ChainAddress.Make(Rng.NextUInt()), Poisoned = poisoned };
+            var w = new Wallet { Address = ChainAddress.Make(Rng.NextUInt()), Poisoned = poisoned, Name = (++WalletSeq).ToString() };
             Wallets.Add(w);
             return w;
         }