fix: refresh balance and transactions in WalletModel.connect() on wallet switch

When a new wallet is connected, clear stale balance and transaction data
from the previous wallet immediately so the view does not display outdated
information while fresh data is being fetched.

Closes: https://github.com/damus-io/damus/issues/3644
Changelog-Fixed: Wallet view now immediately clears stale data when switching wallets
Signed-off-by: Daniel D’Aquino <daniel@daquino.me>
Co-authored-by: Daniel D’Aquino <daniel@daquino.me>
Tested-by: Daniel D’Aquino <daniel@daquino.me>

damus/Features/Wallet/Models/WalletModel.swift

@@ -87,6 +87,10 @@ class WalletModel: ObservableObject {
         notify(.attached_wallet(nwc))
         self.connect_state = .existing(nwc)
         self.previous_state = .existing(nwc)
+        // Reset cached wallet information so the view does not show stale
+        // data from a previously connected wallet while fresh data is loading.
+        self.balance = nil
+        self.transactions = nil
     }
 
     /// Handles an NWC response event and updates the model.

damus/Features/Wallet/Views/WalletView.swift

@@ -106,6 +106,11 @@ struct WalletView: View {
                 .task {
                     await self.refreshWalletInformation()
                 }
+                .onReceive(handle_notify(.attached_wallet)) { _ in
+                    Task {
+                        await self.refreshWalletInformation()
+                    }
+                }
                 .refreshable {
                     await self.refreshWalletInformation()
                 }