fix: don't show failure message on bluefin-cli

[renner0e]

When you decline ujust bluefin-cli with "I'm boring", which happens in ublue-bling, gum will exit with 1, this in turn makes the just recipe fail. It confuses users and makes it seem like the recipe didn't behave as expected.

error: Recipe `aurora-cli` failed on line 36 with exit code 1

Summary by CodeRabbit

• Chores
  • Adjusted system output behavior to reduce message verbosity during operations.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 561df3f3-4ec6-4eb2-8810-c6cd37d78b8c

📥 Commits

Reviewing files that changed from the base of the PR and between b5ea358 and 461285c.

📒 Files selected for processing (1)

• system_files/bluefin/usr/share/ublue-os/just/system.just

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📝 Walkthrough

Walkthrough

A single [no-exit-message] directive is added to the System recipe group in a justfile, suppressing the display of exit messages when that group's recipes complete execution.

Changes

System Recipe Output Configuration

Layer / File(s)	Summary
Justfile Directive system_files/bluefin/usr/share/ublue-os/just/system.just	The [no-exit-message] directive is added to the group('System') section to suppress exit message output for all recipes in that group.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A tiny directive, swift and keen,
Hops through the justfile unseen,
No exit messages shall appear—
The System group runs without cheer! 🐰✨

🚥 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 PR title references suppressing a failure message on bluefin-cli, which aligns with the changeset's addition of [no-exit-message] to suppress the System recipe group's exit message output.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch no-scary-exit-message

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