Method testInsertAddsOneNode

tests/test_context_menu.cpp:91–104

    // ── Insert adds exactly one node ──

    void testInsertAddsOneNode() {
        int before = countNodes();
        uint64_t rootId = m_doc->tree.nodes[0].id;
        m_ctrl->insertNode(rootId, 16, NodeKind::Hex64, "inserted");
        QApplication::processEvents();

        QCOMPARE(countNodes(), before + 1);

        int idx = findNode("inserted");
        QVERIFY(idx >= 0);
        QCOMPARE(m_doc->tree.nodes[idx].kind, NodeKind::Hex64);
        QCOMPARE(m_doc->tree.nodes[idx].offset, 16);
        QCOMPARE(m_doc->tree.nodes[idx].parentId, rootId);
    }

    // ── Insert at auto-offset places after last sibling ──