[FEATURE]:Chat窗口中智能体选择的下拉列表控件太小导致名称较长的智能体无法看到全名

[cjw0511]

Feature hasn't been suggested before.

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Describe the enhancement you want to request

如截图所示，Chat窗口中智能体选择的下拉列表控件太小导致名称较长的智能体无法看到全名，希望增加该下拉列表控件的宽度、同时下拉面板展开时，对于较长名称的选项，能增加鼠标移动hover效果、在鼠标移动到某个智能体名称上时，通过提示气泡显示智能体全名

[github-actions]

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