feat: Add tasks for ATC (#3239)

[KATO-Hiro]

close #3239

Summary by CodeRabbit

• New Features
  • Added support for AtCoder Typical Contest (ATC) entries with contest ID recognition and formatted display (e.g., ATC 001); problem-code matching updated to recognize the atc prefix.
• Tests
  • Added test cases validating ATC contest labels and contest-type detection.

[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

Run ID: 9a1f600f-0a76-40ec-b5fa-95fde2743fc6

📥 Commits

Reviewing files that changed from the base of the PR and between a818766 and 19c9c7e.

📒 Files selected for processing (1)

• src/lib/utils/contest.ts

🚧 Files skipped from review as they are similar to previous changes (1)

• src/lib/utils/contest.ts

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Walkthrough

Adds AtCoder Typical Contest entry atc001, expands AtCoder contest code regex to accept atc-prefixed IDs (with end anchor), and adds corresponding unit tests for name label and contest type.

Changes

Cohort / File(s)	Summary
Contest configuration src/lib/utils/contest.ts	Added atc001: 'AtCoder Typical Contest 001' to ATCODER_OTHERS and updated the AXC regex to include the atc prefix and enforce an end anchor.
Test cases src/test/lib/utils/test_cases/contest_name_labels.ts, src/test/lib/utils/test_cases/contest_type.ts	Added tests verifying atc001 maps to label ATC 001 and to ContestType.OTHERS respectively.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 I found a new trail, a contest to greet,
atc001 hops in with a rhythmic beat,
Regex tweaked gently to welcome the crowd,
Tests clap their paws, happy and proud,
A tiny hop forward — code snug and neat.

🚥 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 'Add tasks for ATC' is concise and directly relates to the main change: adding support for AtCoder Typical Contest (ATC) prefix 'atc001' with corresponding test cases.
Linked Issues check	✅ Passed	The PR expands ATC regex support and adds test cases for 'atc001', which aligns with issue #3239's objective to add DFS problem from AtCoder contest atc001.
Out of Scope Changes check	✅ Passed	All changes are in-scope: contest.ts adds atc001 mapping, and test files add corresponding test cases for contest name labels and contest type classification.
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 (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch #3239

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@src/lib/utils/contest.ts`:
- Around line 317-327: The regexForAxc currently matches "atc" with only three
digits but lacks an end anchor and classifyContest still only special-cases
atc001; update regexForAxc to require end-of-string so it rejects "atc1234"
(i.e., make it match ^(abc|arc|agc|atc)\d{3}$) and update classifyContest to
explicitly treat any contest_id matching /^atc\d{3}$/i as ContestType.OTHERS
(the same classification used for atc001) so admin import logic (the code around
the current admin import check) and rendering remain consistent; alternatively
have the admin import flow call classifyContest instead of repeating checks so
both use the same rule.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6c031ac4-01f3-44f7-9fc3-d6878025ae15

📥 Commits

Reviewing files that changed from the base of the PR and between 339953f and a818766.

📒 Files selected for processing (3)

• src/lib/utils/contest.ts
• src/test/lib/utils/test_cases/contest_name_labels.ts
• src/test/lib/utils/test_cases/contest_type.ts

[KATO-Hiro]

LGTM