refactor(ui): remove SPV badge from tx detail and history

SPV is the only verification method the wallet uses, so showing it as a
badge adds no information — if a transaction appears confirmed, it has
already passed Merkle verification.

- Remove the SPV chip from the transaction detail overlay
- Remove the Verificata column from the history list (desktop and mobile)
- Drop VerifiedText property from TransactionDetailsViewModel
- Drop the Verificata field from HistoryRow
- Remove the orphaned tx.verified loc key

src/App/ViewModels/MainWindowViewModel.Receive.cs

@@ -272,8 +272,7 @@ public partial class MainWindowViewModel
             History.Add(new HistoryRow(
                 tx.Height > 0 ? tx.Height.ToString() : "mempool",
                 (tx.DeltaSats >= 0 ? "+" : "") + Fmt(tx.DeltaSats, withLabel: false),
-                tx.Txid,
-                tx.Verified ? "✓ SPV" : "—"));
+                tx.Txid));
 
         Addresses.Clear();
         foreach (var a in cache.Addresses)

src/App/ViewModels/MainWindowViewModel.cs

@@ -17,7 +17,7 @@ using PalladiumWallet.Core.Wallet;
 namespace PalladiumWallet.App.ViewModels;
 
 /// <summary>Transaction history row for the view.</summary>
-public sealed record HistoryRow(string Conferma, string Importo, string Txid, string Verificata);
+public sealed record HistoryRow(string Conferma, string Importo, string Txid);
 
 /// <summary>Address view row with pre-computed keys and derivation path.</summary>
 public sealed record AddressRow(

src/App/ViewModels/TransactionDetailsViewModel.cs

@@ -62,8 +62,6 @@ public sealed class TransactionDetailsViewModel
         VersionText = d.Version.ToString();
         LockTimeText = d.LockTime.ToString();
         RbfText = loc[d.RbfSignaled ? "tx.yes" : "tx.no"];
-        VerifiedText = d.Verified ? "✓ SPV" : "—";
-
         Inputs = new ObservableCollection<TxIoRow>(d.Inputs.Select((i, n) => new TxIoRow(
             i.IsCoinbase ? loc["tx.coinbase"] : $"{Shorten(i.PrevTxid)}:{i.PrevIndex}",
             i.IsCoinbase ? loc["tx.coinbase.newcoins"] : i.Address ?? "—",
@@ -93,7 +91,6 @@ public sealed class TransactionDetailsViewModel
     public string VersionText { get; }
     public string LockTimeText { get; }
     public string RbfText { get; }
-    public string VerifiedText { get; }
     public ObservableCollection<TxIoRow> Inputs { get; }
     public ObservableCollection<TxIoRow> Outputs { get; }