List transactions newest first on both chains

apps/ios/Koins/Wallet/MoneroService.swift

@@ -168,6 +168,33 @@ final class MoneroService {
     return response["mnemonic"] as? String ?? ""
   }
 
+  /// Block time for a height. wallet2 keeps no timestamp for transfers, so the
+  /// only way to date a Monero transaction is to ask the daemon for the block
+  /// it landed in.
+  func blockTimestamp(height: UInt64) async throws -> Date? {
+    guard let url = URL(string: "http://\(Self.daemonHost):18081/json_rpc") else { return nil }
+    var request = URLRequest(url: url)
+    request.httpMethod = "POST"
+    request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+    request.timeoutInterval = 15
+    request.httpBody = try JSONSerialization.data(withJSONObject: [
+      "jsonrpc": "2.0",
+      "id": "koins",
+      "method": "get_block_header_by_height",
+      "params": ["height": height],
+    ])
+
+    let (data, response) = try await URLSession.shared.data(for: request)
+    guard let http = response as? HTTPURLResponse, (200..<300).contains(http.statusCode),
+          let json = try JSONSerialization.jsonObject(with: data) as? [String: Any],
+          let result = json["result"] as? [String: Any],
+          let header = result["block_header"] as? [String: Any],
+          let timestamp = (header["timestamp"] as? NSNumber)?.doubleValue, timestamp > 0 else {
+      return nil
+    }
+    return Date(timeIntervalSince1970: timestamp)
+  }
+
   // MARK: - Reads
 
   func balance() async throws -> Balance {
@@ -201,6 +228,21 @@ final class MoneroService {
         note: (entry["note"] as? String).flatMap { $0.isEmpty ? nil : $0 },
         weight: (entry["weight"] as? NSNumber)?.uint64Value)
     }
+    .sorted { newestFirst($0, $1) }
+  }
+
+  /// Newest first. wallet2 gives transfers no timestamp, but the block height is
+  /// chronological and always present, so that is the ordering key; anything
+  /// still in the pool (height 0) belongs at the top.
+  private func newestFirst(_ left: TransactionRecord, _ right: TransactionRecord) -> Bool {
+    func key(_ record: TransactionRecord) -> UInt64 {
+      guard let height = record.height, height > 0 else { return .max }
+      return height
+    }
+    let leftKey = key(left)
+    let rightKey = key(right)
+    if leftKey != rightKey { return leftKey > rightKey }
+    return (left.timestamp ?? .distantFuture) > (right.timestamp ?? .distantFuture)
   }
 
   // MARK: - Accounts