fix(cashu): return to the Wallet hub after deleting the wallet

Deleting the Cashu wallet popped back to CashuWalletScreen, which on an
empty wallet auto-launches the find-or-create wizard — so the user was
funneled straight back into creating the wallet they just deleted.

Navigate to the top-level Wallet hub (Route.Wallet) via newStack instead,
which pops the Cashu screens off the back stack so the wizard never
composes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EqmMR2QiULS5QGosSgSQAe

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/wallet/CashuWalletSettingsScreen.kt

@@ -341,11 +341,14 @@ fun CashuWalletSettingsScreen(
                 TextButton(
                     onClick = {
                         showDeleteWalletConfirm = false
-                        // Tear down the wallet, then drop back to the wallet
-                        // screen, which re-renders to its empty/create state
-                        // once walletEvent flips to null.
+                        // Tear down the wallet, then go to the top-level Wallet
+                        // hub — NOT back to CashuWalletScreen, which on an empty
+                        // wallet auto-launches the find-or-create wizard and
+                        // would funnel the user straight back into creating the
+                        // wallet they just deleted. newStack pops the Cashu
+                        // screens off the back stack so the wizard never composes.
                         viewModel.deleteWallet(onDone = {})
-                        nav.popBack()
+                        nav.newStack(Route.Wallet)
                     },
                 ) { Text(stringRes(R.string.cashu_settings_delete_wallet)) }
             },