Method testInsertAutoOffset

tests/test_context_menu.cpp:108–119

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

    void testInsertAutoOffset() {
        uint64_t rootId = m_doc->tree.nodes[0].id;

        // Last child is "flags" at offset 12, size 4 → end = 16
        m_ctrl->insertNode(rootId, -1, NodeKind::Hex64, "autoPlaced");
        QApplication::processEvents();

        int idx = findNode("autoPlaced");
        QVERIFY(idx >= 0);
        // Hex64 is 8-byte aligned, next aligned offset after 16 is 16
        QCOMPARE(m_doc->tree.nodes[idx].offset, 16);
    }

    // ── Duplicate creates exactly one copy ──