fix(amm): label sample swaps as previews

apps/amm/qml/components/swap/SwapCard.qml

@@ -22,19 +22,13 @@ Rectangle {
     }
 
     signal requestTokenSelect(string side)
-    signal submitRequested(var snapshot)
+    signal previewRequested(var snapshot)
 
     function setToken(side, token) {
         if (side === "sell") root.sellToken = token
         else root.buyToken = token
     }
 
-    function resetAmounts() {
-        root.sellInput = ""
-        root.buyInput = ""
-        root.editingSide = "sell"
-    }
-
     readonly property real sellReserve: sellToken ? (sellToken.reserve || 0) : 0
     readonly property real buyReserve: buyToken ? (buyToken.reserve || 0) : 0
 
@@ -73,7 +67,7 @@ Rectangle {
         if (!hasAmount || !tokensSelected) return qsTr("Enter an amount")
         if (insufficientBalance) return qsTr("Insufficient balance")
         if (insufficientLiquidity) return qsTr("Insufficient liquidity")
-        return qsTr("Swap")
+        return qsTr("Preview swap")
     }
 
     function formatAmountValue(val) {
@@ -235,6 +229,7 @@ Rectangle {
 
         Rectangle {
             id: ctaBox
+            objectName: "swapPreviewButton"
             Layout.fillWidth: true
             Layout.topMargin: 8
             Layout.bottomMargin: 8
@@ -262,7 +257,7 @@ Rectangle {
                 enabled: root.canSubmit
                 cursorShape: root.canSubmit ? Qt.PointingHandCursor : Qt.ArrowCursor
                 onClicked: {
-                    if (root.canSubmit) root.submitRequested(root.buildSnapshot())
+                    if (root.canSubmit) root.previewRequested(root.buildSnapshot())
                 }
             }
         }

apps/amm/qml/pages/SwapPage.qml

@@ -93,6 +93,7 @@ Item {
 
             SwapCard {
                 id: swapCard
+                objectName: "swapCard"
                 Layout.alignment: Qt.AlignHCenter
                 theme: pageTheme
                 tokens: root.tokens
@@ -103,18 +104,20 @@ Item {
                     tokenModal.open()
                 }
 
-                onSubmitRequested: function(snapshot) {
+                onPreviewRequested: function(snapshot) {
                     swapConfirmationDialog.openWithSnapshot(snapshot)
                 }
             }
 
             Text {
+                objectName: "swapPreviewNotice"
                 Layout.alignment: Qt.AlignHCenter
-                text: "Buy and sell crypto on <font color='" + pageTheme.colors.textPrimary + "'>LEZ</font>."
-                textFormat: Text.RichText
+                Layout.maximumWidth: Math.max(0, Math.min(480, root.width - 32))
+                text: qsTr("Preview only — sample data. No swap will be submitted.")
                 color: pageTheme.colors.textSecondary
                 font.pixelSize: 15
                 horizontalAlignment: Text.AlignHCenter
+                wrapMode: Text.WordWrap
             }
         }
 
@@ -133,18 +136,6 @@ Item {
             }
         }
 
-        SuccessToast {
-            id: swapToast
-
-            width: Math.max(0, Math.min(380, parent.width - 32))
-
-            anchors {
-                bottom: parent.bottom
-                bottomMargin: 24
-                horizontalCenter: parent.horizontalCenter
-            }
-        }
-
         Component {
             id: swapConfirmationSummary
 
@@ -155,19 +146,11 @@ Item {
 
         TransactionConfirmationDialog {
             id: swapConfirmationDialog
-            title: qsTr("Confirm swap")
-            confirmText: qsTr("Confirm swap")
+            objectName: "swapPreviewDialog"
+            title: qsTr("Swap preview")
+            cancelText: qsTr("Back")
+            confirmText: qsTr("Done")
             summary: swapConfirmationSummary
-
-            onConfirmed: function(snapshot) {
-                swapCard.resetAmounts()
-                swapToast.show(qsTr("Swap submitted"),
-                               qsTr("%1 %2 → %3 %4")
-                                    .arg(snapshot.sellAmount)
-                                    .arg(snapshot.sellToken)
-                                    .arg(snapshot.minReceived)
-                                    .arg(snapshot.buyToken))
-            }
         }
     }
 }

apps/amm/tests/qml/tst_SwapPage.qml

@@ -0,0 +1,57 @@
+pragma ComponentBehavior: Bound
+
+import QtQuick
+import QtTest
+
+import "../../qml/pages" as Pages
+
+Item {
+    id: root
+
+    width: 800
+    height: 700
+
+    Component {
+        id: pageComponent
+
+        Pages.SwapPage {
+            width: root.width
+            height: root.height
+        }
+    }
+
+    TestCase {
+        name: "SwapPage"
+        when: windowShown
+
+        function test_tradeIsExplicitPreviewAndPreservesDraft() {
+            const page = createTemporaryObject(pageComponent, root)
+            verify(page)
+
+            const notice = findChild(page, "swapPreviewNotice")
+            const card = findChild(page, "swapCard")
+            const dialog = findChild(page, "swapPreviewDialog")
+            verify(notice)
+            verify(card)
+            verify(dialog)
+            verify(notice.text.indexOf("Preview only") >= 0)
+            verify(notice.text.indexOf("No swap will be submitted") >= 0)
+
+            card.setToken("sell", page.tokens[0])
+            card.setToken("buy", page.tokens[1])
+            card.sellInput = "1"
+            card.editingSide = "sell"
+            tryCompare(card, "canSubmit", true)
+            compare(card.submitButtonText, "Preview swap")
+
+            card.previewRequested(card.buildSnapshot())
+            tryCompare(dialog, "opened", true)
+            compare(dialog.title, "Swap preview")
+            compare(findChild(dialog, "transactionConfirmButton").text, "Done")
+
+            dialog.confirm()
+            tryCompare(dialog, "opened", false)
+            compare(card.sellInput, "1")
+        }
+    }
+}