chore: Update button label in contest table (#3135)

[KATO-Hiro]

close #3135

Summary by CodeRabbit

• UI Improvements

  • Updated display labels for ACL and JOI contest provider groups for improved clarity

• Documentation

  • Added comprehensive testing documentation including preset creation and verification examples

• Tests

  • Expanded test coverage for contest provider presets with additional validation scenarios

[coderabbitai]

Walkthrough

Updated UI labels for contest provider presets (ACL and JOI groups), expanded test coverage for prepareContestProviderPresets functionality with multiple preset verification tests, and added comprehensive documentation about testing this feature.

Changes

Cohort / File(s)	Summary
UI Label Updates src/lib/utils/contest_table_provider.ts	Updated button labels: "ACL" → "AtCoder Library (ACL)" and JOI Second Qual Round group header/buttonLabel shortened to "JOI 二次予選・本選".
Test Coverage Expansion src/test/lib/utils/contest_table_provider.test.ts	Added extensive test cases for prepareContestProviderPresets() covering multiple preset types (DPs, ACL, JOI rounds) with verification of metadata, display configuration, size, and provider instances.
Documentation Updates docs/guides/how-to-add-contest-table-provider.md	Added documentation sections detailing tests for prepareContestProviderPresets() including group name verification, metadata checks, provider count checks, and provider instance type validation with section identifiers and examples.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 Buttons polished bright and clear,
ACL gets its proper cheer,
JOI names all simplified just right,
Tests expanded, documentation in sight!
Labels dance, coverage grows wide,
Quality improvements spread with pride! ✨

🚥 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 accurately reflects the main change: updating button labels in the contest table as specified in issue #3135.
Linked Issues check	✅ Passed	The code changes fully implement the two label updates required by issue #3135: ACL→AtCoder Library (ACL) and JOI label simplification.
Out of Scope Changes check	✅ Passed	Changes are limited to label updates in contest_table_provider.ts, documentation, and test expansion—all directly related to the linked issue requirements.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch #3135

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[KATO-Hiro]

LGTM