修复 #6038 中，实例列表中右键编辑时，不改实例名称就无法保存的问题

[Hylfrd]

fix #6038 (comment)

并对自动起名加了null检测

[Hylfrd]

我其实更倾向于 revert #6038，参考 #6646 (comment) ，我认为这个功能应当在 #3683 中一并处理掉，因为右键的动线在目前 HMCL 的UI设计中很诡异，整个HMCL就没有通过右键来完成某项功能的点，首先就很难找

[Glavo]

@codex review

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-15T12:14:52.233791Z	8fa9cd2	Manual request

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[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Hooray!

Reviewed commit: 8fa9cd2fe7

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