fix(amm): end submits when backend disconnects

apps/amm/qml/components/liquidity/NewPositionForm.qml

@@ -1300,6 +1300,7 @@ AmmActionCard {
             "wallet_unavailable": qsTr("Wallet is unavailable."),
             "wallet_syncing": qsTr("Wallet is still syncing. Review the quote while it finishes."),
             "wallet_submission_failed": qsTr("Wallet submission failed. Review and retry manually."),
+            "submission_status_unknown": qsTr("Connection was lost before submission status was known. Check wallet activity before retrying."),
             "signature_rejected": qsTr("Wallet approval was rejected."),
             "quote_changed": qsTr("Pool or wallet state changed. Review the refreshed quote."),
             "quote_not_submittable": qsTr("Current quote cannot be submitted."),

apps/amm/qml/state/NewPositionFlow.qml

@@ -106,6 +106,16 @@ QtObject {
             Qt.callLater(function() { root.quoteRefreshRequested(true) })
     }
 
+    onBackendReadyChanged: {
+        if (root.backendReady || !root.submitting)
+            return
+        root.submitRequestId = 0
+        root.submitting = false
+        root.pendingSubmitSnapshot = ({})
+        root.flowErrorCode = "submission_status_unknown"
+        root.submitFailed()
+    }
+
     function contextHints(refreshPublicData) {
         const request = root.pendingQuoteRequest.request || {}
         const recent = []

apps/amm/tests/qml/tst_LiquidityPage.qml

@@ -28,6 +28,7 @@ TestCase {
             })
             property var newPositionQuoteResult: ({})
             property var newPositionSubmitResult: ({})
+            property bool deferSubmitResult: false
             property var newPositionContext: ({
                 "schema": "new-position.v2",
                 "status": "ready",
@@ -43,7 +44,8 @@ TestCase {
                 ++submitCalls
                 var result = JSON.parse(JSON.stringify(submitResult || ({})))
                 result.requestId = requestId
-                newPositionSubmitResult = result
+                if (!deferSubmitResult)
+                    newPositionSubmitResult = result
             }
 
             function requestNewPositionQuote(request, requestId, forceRefresh) {
@@ -244,6 +246,40 @@ TestCase {
         verify(!page.flow.submitting)
     }
 
+    function test_backendLossEndsSubmissionWithUnknownStatus() {
+        var backend = createTemporaryObject(backendComponent, testCase, {
+            "deferSubmitResult": true,
+            "submitResult": {
+                "schema": "new-position.v2",
+                "status": "submitted",
+                "transactionId": submittedTransactionId
+            }
+        })
+        var page = createTemporaryObject(pageComponent, testCase, { "backend": backend })
+        verify(page)
+
+        page.flow.confirm({ "request": ({}), "quoteHash": "sha256:expected" })
+        const staleRequestId = page.flow.submitRequestId
+        verify(page.flow.submitting)
+        verify(staleRequestId > 0)
+
+        page.backend = null
+        tryCompare(page.flow, "submitting", false)
+        compare(page.flow.submitRequestId, 0)
+        compare(page.flow.flowErrorCode, "submission_status_unknown")
+
+        page.backend = backend
+        backend.newPositionSubmitResult = {
+            "schema": "new-position.v2",
+            "status": "submitted",
+            "transactionId": submittedTransactionId,
+            "requestId": staleRequestId
+        }
+        wait(0)
+        compare(page.flow.transactionId, "")
+        compare(page.flow.flowErrorCode, "submission_status_unknown")
+    }
+
     function test_poolProbeDoesNotPublishProbeAsCurrentQuote() {
         var backend = createTemporaryObject(backendComponent, testCase)
         var page = createTemporaryObject(pageComponent, testCase, { "backend": backend })