fix(cashu): correct skip-on-decrypt-fail + auto-resume orphan mint quotes

Two small follow-ups to the audit refactor:

* recomputeUnspent: replace the broken `getOrPut { ... return@forEach }`
  pattern (which short-circuited the outer loop on a single decryption
  failure, skipping remaining tokens) with an explicit containsKey
  guard. Decryption failures are now individually skipped without
  affecting other tokens in the same pass.

* CashuWalletScreen: when the wallet opens and pendingQuotes (live
  flow from CashuWalletState) is non-empty, automatically resume the
  most recent kind:7374 by re-polling the mint and reopening the
  receive dialog. Without this, a user who backgrounded the app
  mid-mint would see no indication their pending invoice exists.

https://claude.ai/code/session_01MdWddiar819f8XYt5N8BjP

amethyst/src/main/java/com/vitorpamplona/amethyst/model/nip60Cashu/CashuWalletState.kt

@@ -324,12 +324,18 @@ class CashuWalletState(
     private suspend fun recomputeUnspent() {
         val all = tokenEvents.values.toList()
         // Decrypt anything we haven't seen before; reuse cached TokenContent
-        // for events we've already decrypted.
+        // for events we've already decrypted. Decryption failures are
+        // skipped — the proof set rebuilds the next time a re-key happens.
         all.forEach { evt ->
-            tokenContents.getOrPut(evt.id) {
-                runCatching { evt.tokenContent(signer) }
-                    .onFailure { Log.w("CashuWallet") { "Failed to decrypt token ${evt.id.take(8)}: ${it.message}" } }
-                    .getOrNull() ?: return@getOrPut return@forEach
+            if (!tokenContents.containsKey(evt.id)) {
+                val content =
+                    runCatching { evt.tokenContent(signer) }
+                        .onFailure {
+                            Log.w("CashuWallet") {
+                                "Failed to decrypt token ${evt.id.take(8)}: ${it.message}"
+                            }
+                        }.getOrNull()
+                if (content != null) tokenContents[evt.id] = content
             }
         }
 

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

@@ -97,12 +97,23 @@ fun CashuWalletScreen(
     val mints by viewModel.mints.collectAsState()
     val balanceSats by viewModel.balanceSats.collectAsState()
     val history by viewModel.history.collectAsState()
+    val pendingQuotes by viewModel.pendingQuotes.collectAsState()
 
     var receiveOpen by remember { mutableStateOf(false) }
     var sendLnOpen by remember { mutableStateOf(false) }
     var sendTokenOpen by remember { mutableStateOf(false) }
     var redeemOpen by remember { mutableStateOf(false) }
 
+    // If the user has an unfinished kind:7374 quote, surface it the next time
+    // they open the wallet so the in-flight invoice isn't lost. Auto-resumes
+    // the most recent quote on first composition.
+    LaunchedEffect(pendingQuotes) {
+        if (!receiveOpen && pendingQuotes.isNotEmpty()) {
+            viewModel.resumeMintQuote(pendingQuotes.first())
+            receiveOpen = true
+        }
+    }
+
     Scaffold(
         topBar = {
             TopAppBar(