fix: make CoreCheckBox import org.bitcoincore.qt

qml/controls/CoreCheckBox.qml

@@ -4,6 +4,7 @@
 
 import QtQuick 2.15
 import QtQuick.Controls 2.15
+import org.bitcoincore.qt 1.0
 
 AbstractButton {
     id: root

test/qml/bitcoin_qmltests.qrc

@@ -9,6 +9,7 @@
         <file>tst_contextmenupicker.qml</file>
         <file>tst_contextmenu.qml</file>
         <file>tst_contextmenutoggle.qml</file>
+        <file>tst_corecheckbox.qml</file>
         <file>tst_createbackup.qml</file>
         <file>tst_createname.qml</file>
         <file>tst_createpassword.qml</file>

test/qml/tst_corecheckbox.qml

@@ -0,0 +1,66 @@
+// Copyright (c) 2026 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+import QtQuick 2.15
+import QtTest 1.2
+import org.bitcoincore.qt 1.0
+import "../../qml/controls"
+
+TestCase {
+    name: "CoreCheckBox"
+    when: windowShown
+    width: 400
+    height: 200
+
+    property bool initialIsDesktop: true
+
+    Component {
+        id: checkBoxComponent
+        CoreCheckBox {}
+    }
+
+    function initTestCase() {
+        // AppMode is a process-wide singleton shared with the other test files.
+        initialIsDesktop = AppMode.isDesktop
+    }
+
+    function cleanupTestCase() {
+        AppMode.isDesktop = initialIsDesktop
+    }
+
+    function test_hover_enabled_follows_app_mode() {
+        const box = createTemporaryObject(checkBoxComponent, this)
+        verify(box !== null)
+
+        AppMode.isDesktop = true
+        compare(box.hoverEnabled, true)
+
+        AppMode.isDesktop = false
+        compare(box.hoverEnabled, false)
+
+        AppMode.isDesktop = true
+        compare(box.hoverEnabled, true)
+    }
+
+    function test_toggles_and_reflects_checked_state() {
+        const box = createTemporaryObject(checkBoxComponent, this)
+        verify(box !== null)
+        verify(box.checkable)
+        verify(!box.checked)
+        compare(box.contentItem.color, "#00000000")
+        compare(box.contentItem.border.color, box.borderColor)
+
+        box.toggle()
+
+        verify(box.checked)
+        compare(box.contentItem.color, box.fillColor)
+        compare(box.contentItem.border.color, box.fillColor)
+
+        box.toggle()
+
+        verify(!box.checked)
+        compare(box.contentItem.color, "#00000000")
+        compare(box.contentItem.border.color, box.borderColor)
+    }
+}