Fix combobox overflow in SelectDialog by removing fixed width constraint

[Copilot]

The "New Menu Type Selection" dialog's combobox extended beyond dialog boundaries. RComboBox has AutoSize=true with MinWidth=120px, but SelectDialog assigned a fixed 85px width and calculated form size before items were added. When items were added, the combobox auto-resized but the dialog did not.

Changes

• Removed fixed width assignment in InitializeComponents()
• Added AdjustLayout() method to dynamically position buttons and resize dialog based on actual combobox width
• Modified Items setter to call AdjustLayout() after items are added

public string[] Items
{
    set
    {
        cmbItems.Items.Clear();
        cmbItems.Items.AddRange(value);
        AdjustLayout(); // Recalculate layout after RComboBox auto-sizes
    }
}

private void AdjustLayout()
{
    var a = 20.DpiZoom();
    btnOK.Left = cmbItems.Right + a;
    btnCancel.Left = btnOK.Right + a;
    ClientSize = new Size(btnCancel.Right + a, btnCancel.Bottom + a);
    cmbItems.AutosizeDropDownWidth();
}

Dialog now adapts to combobox's actual width after content is loaded.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Bug]: 新建菜单菜单类型选择框超出</issue_title>
<issue_description>### 检查项

• 此错误未被报告过（可以在这里进行搜索）
• 我已将 ContextMenuManager 更新到最新版本
• 我已知晓：任何不合规定的 issue 都有可能被直接关闭

Windows

Windows 11

版本

3.6.2.1

复现流程

点击新建菜单项目：

崩溃日志

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Bug]: 新建菜单菜单类型选择框超出 #91

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