fix: 修复vxe-table高度样式问题

[cshaptx4869]

问题：启用 footer 时，高度不够时会被自动拉伸高度

修复：设置 table 的 minHeight（默认是 144）

问题：没有数据行时，自定义列配置高度很小（因为设置了 max-height: 8px;）

修复：修改样式，设置 min-height

[ke8xiao]

Preparing review...

[ke8xiao]

Preparing review...

[ke8xiao]

Preparing review...

[ke8xiao]

Preparing review...

[ke8xiao]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Table Height Configuration Verify that the new minHeight: 46 setting works as expected with footer enabled and doesn't cause unexpected layout issues. minHeight: 46, Custom Column Styling Validate that the new min-height: 80px for custom column configuration improves empty table display without affecting other table states. min-height: 80px;