Stabilize emoji use in tests

[kenoss]

Depends on #188 (merged)

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Before this patch, some test results were unstable:

    4       │-✔ Default toolchain set to version 'latest'
          4 │+Default toolchain set to version 'latest'

This is because console crate uses LANG for check that we should use
emoji or not.
https://github.com/console-rs/console/blob/0.16.3/src/unix_term.rs#L389-L396

To stabilize the results, this patch adds the environment variable
LANG for tests.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 266f253 and 60ba58a.

📒 Files selected for processing (1)

• pixi.toml

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Summary by CodeRabbit

• Chores
  • Updated test commands to run with a consistent English UTF-8 locale during snapshot review.
  • Existing test output settings remain the same, including the dedicated test target directory and all-features variant.

Walkthrough

The pixi.toml file's test and test-all tasks were updated to inject LANG = "en_US.UTF-8" into the environment for cargo insta test --review executions, alongside the existing CARGO_TARGET_DIR = "target/insta" setting.

Changes

pixi.toml task environment update

Layer / File(s)	Summary
Add LANG environment variable to insta test tasks pixi.toml	The test and test-all tasks now set LANG = "en_US.UTF-8" in addition to CARGO_TARGET_DIR = "target/insta" for cargo insta test --review runs.

Possibly related PRs

• chawyehsu/moonup#188: Both PRs modify the same pixi.toml test/test-all tasks for cargo insta test --review, adding environment variables (CARGO_TARGET_DIR versus LANG).

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[stage-review]

Ready to review this PR? Stage has broken it down into 1 individual chapter for you:

	Title
1	Stabilize test emoji output via LANG environment variable

_{Chapters generated by Stage for commit 60ba58a on Jul 3, 2026 11:29pm UTC.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.78%. Comparing base (266f253) to head (60ba58a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #194   +/-   ##
=======================================
  Coverage   89.78%   89.78%           
=======================================
  Files          24       24           
  Lines        1429     1429           
=======================================
  Hits         1283     1283           
  Misses        146      146           

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[kenoss]

Rebased.

[chawyehsu]

I think it would be more appropriate to put this env var in the TestWorkspace::cmd since there's already some other env vars for stabilizing tests there. Could you please test if it would work?