refactor: 다음 단계 핸들러 조건부 로직 단순화

[minzziPark]

작업 사항

스터디를 신청하는 과정중 다음 단계로 넘어가는 핸들러의 조건부 로직이 개선이 될 수 있을 것 같아 리팩터링을 진행했습니다.

1. 매직넘버 제거
   currentStep === 2에서 2는 매직 넘버로 강의를 선택하는 단계의 변수를 할당하여 매직넘버를 제거해주었습니다.
   COURSE_STEP = 2
2. if (currentStep >= TOTAL_STEPS) return;
   함수 가장 상단에 step을 확인하여 가독성을 높였습니다.

관련 이슈

close #163

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

---

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.}

[Copilot]

Pull Request Overview

This PR refactors the handleClickNextStep function in the Study Application Form to improve code readability and maintainability. The changes include extracting a magic number into a named constant and simplifying the control flow by using an early return pattern.

• Introduced a named constant COURSE_STEP to replace the magic number 2
• Simplified nested conditionals by converting to early return pattern
• Improved code readability by flattening the control flow structure

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[ohinhyuk]

@minzziPark 수고 많으셨습니다!