fix(test): 全局语言状态互斥锁隔离并行测试

[ra1nyxin]

Rust 帮助文本测试共享进程级语言状态，并行执行时可能读取到其他测试临时设置的语言。

为相关测试增加互斥锁，并在 Emoji 测试开始时明确设置英文，消除这类不稳定失败。

本地未运行测试，交由 CI 验证。

Summary by CodeRabbit

• Tests
  • Improved test reliability by preventing concurrent language-setting tests from interfering with one another.
  • Ensured localized help and keyboard shortcut tests run consistently.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e5275bfa-39ed-465e-bf48-c46963d26e58

📥 Commits

Reviewing files that changed from the base of the PR and between fce6635 and 43bc165.

📒 Files selected for processing (1)

• rust/src/cli.rs

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

CLI tests that modify the process-global display language now use a shared mutex. This prevents concurrent language changes while tests generate localized help output.

Changes

CLI test isolation

Layer / File(s)	Summary
Serialize display-language changes rust/src/cli.rs	Defines LANGUAGE_LOCK and uses it in both tests that call set_lang.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 43bc1

The PR serializes test-time changes to shared language state and prevents parallel tests from interfering with one another without changing production behavior. No actionable merge-blocking risk remains beyond normal checks.

Suggested reviewers: vincentzyu233

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: adding mutual exclusion for shared global language state in parallel tests.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 1 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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