Bump BDK version

chore: update bdk version to fix an xcode bug preventing the simulator and preview from working

fix: prevent transactions list from crashing

iosApp/iosApp.xcodeproj/project.pbxproj

@@ -608,7 +608,7 @@
 			repositoryURL = "https://github.com/bitcoindevkit/bdk-swift.git";
 			requirement = {
 				kind = exactVersion;
-				version = 0.31.0;
+				version = 0.31.1;
 			};
 		};
 /* End XCRemoteSwiftPackageReference section */

iosApp/iosApp.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -1,14 +1,15 @@
 {
+  "originHash" : "ca3197f4ba2afd517d13387ef91c0c2e58f0be47e5ec0fae62ba8325d4605b8a",
   "pins" : [
     {
       "identity" : "bdk-swift",
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/bitcoindevkit/bdk-swift.git",
       "state" : {
-        "revision" : "20ca547a69487a41665ad7d92b0f1aa46b84d9d0",
-        "version" : "0.31.0"
+        "revision" : "f2398109ebd8759322f601d9938779f3cdf99a12",
+        "version" : "0.31.1"
       }
     }
   ],
-  "version" : 2
+  "version" : 3
 }

iosApp/iosApp/WalletView.swift

@@ -248,7 +248,7 @@ struct WalletTransactionsListItemView: View {
 
             Spacer()
             Text(
-                transaction.sent > 0
+                transaction.sent > transaction.received
                 ? "- \(transaction.sent - transaction.received) sats"
                 : "+ \(transaction.received - transaction.sent) sats"
             )