Always store full bank description in memo for SimpleFIN

Use the raw Description field as memo so the full bank text
(e.g. "Card purchase BUYVM VPS* FRANTECH 11 MY.FRANTECH.C WY
02-08-2026") is always visible. The cleaned Payee field is still
used for the payee name and matching.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/Purrse.Plugins.BankSync/SimpleFinSyncProvider.cs

@@ -84,7 +84,7 @@ public class SimpleFinSyncProvider : IAccountSyncProvider
                     Date = DateTimeOffset.FromUnixTimeSeconds(t.Posted).UtcDateTime,
                     Amount = decimal.TryParse(t.Amount, out var amt) ? amt : 0,
                     PayeeName = t.Payee ?? t.Description,
-                    Memo = t.Memo ?? t.Description,
+                    Memo = t.Description,
                     FitId = t.Id,
                     TransactionType = decimal.TryParse(t.Amount, out var a) && a >= 0 ? "credit" : "debit"
                 }).ToList()