feat - 카카오 로그인 기능 추가 및 로그인 페이지 UI 업데이트

[mark77234]

작업내용

• 환경변수 설정 .xcconfig (baseUrl, kakaoNativekey)
• 카카오 sdk 설정
• 카카오 로그인 api 연동
• 로그인 화면 UI 업데이트(배경 영상, 타이틀 이미지 추가)

남은작업

서버 카카오 로그인 403 이슈 대응 이후

• 로그아웃
• 회원 탈퇴
• 인터셉터 추가 (Authorization 헤더에 access token 추가)
• 401 응답 시 토큰 재발급 /api/jwt/exchange

액세스 만료는 401? 리프래시 만료 응답상태코드?

[Copilot]

Pull request overview

This PR implements Kakao social login functionality and updates the login screen UI with a background video and new title image. The implementation follows good architectural patterns by extracting login logic into a dedicated LoginViewModel, separating concerns between the Kakao SDK integration (KakaoLoginService) and backend authentication (AuthenticationService), and properly configuring environment variables through .xcconfig files.

Changes:

• Refactored AppFlowViewModel to AppViewModel with extracted LoginViewModel for better separation of concerns
• Integrated Kakao iOS SDK with proper error handling and async/await patterns
• Redesigned login screen with background video, gradient overlay, and new branding assets
• Added environment configuration support through .xcconfig files for BASE_URL and KAKAO_NATIVE_APP_KEY

Reviewed changes

Copilot reviewed 18 out of 24 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
KillingPart/ViewModels/AppViewModel.swift	New view model that manages app flow and owns LoginViewModel instance
KillingPart/ViewModels/LoginViewModel.swift	Extracted login logic with Kakao integration, proper error handling, and state management
KillingPart/ViewModels/AppFlowViewModel.swift	Removed in favor of refactored AppViewModel
KillingPart/Views/Screens/RootFlowView.swift	Updated to use AppViewModel and pass LoginViewModel to LoginView
KillingPart/Views/Screens/Auth/LoginView.swift	Completely redesigned with video background, gradient overlay, and Kakao login button
KillingPart/Views/Screens/Auth/Components/LoginBackgroundVideoView.swift	New component implementing looping background video with lifecycle management
KillingPart/Views/Screens/Auth/Components/KakaoLoginButton.swift	New Kakao-branded login button with loading state
KillingPart/Services/KakaoLoginService.swift	New service wrapping Kakao SDK with proper async/await conversion and error handling
KillingPart/Services/AuthenticationService.swift	Extended with Kakao login endpoint integration and debug logging
KillingPart/Services/APIConfiguration.swift	New configuration helper for building API endpoints from BASE_URL
KillingPart/Models/KakaoSocialLoginModels.swift	Request/response models for Kakao login backend integration
KillingPart/KillingPartApp.swift	Added Kakao SDK initialization and URL handling for OAuth callback
KillingPart/Info.plist	Added environment variables, URL schemes, and query schemes for Kakao integration
KillingPart.xcodeproj/project.pbxproj	Added Kakao SDK dependencies and xcconfig file references
.gitignore	Added *.xcconfig to prevent committing secrets
KillingPart/Assets.xcassets/Login/*	Added login title images and Kakao bubble icon assets

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[Copilot]

The onChange handler for scenePhase only plays the video when the app becomes active, but doesn't pause it when the app goes to the background or becomes inactive. This can cause unnecessary battery drain and resource usage. Consider adding an else clause to pause the video when the phase is not active.

Suggested change

	videoPlayer.play()
	videoPlayer.play()
	} else {
	videoPlayer.pause()

[Copilot]

The Kakao SDK dependency is pinned to the master branch instead of a specific version. This can lead to unexpected breaking changes when the dependency updates automatically. Consider pinning to a specific version tag or at minimum using a version range to ensure stability and reproducible builds.

Suggested change

	branch = master;
	kind = branch;
	kind = exactVersion;
	version = 2.21.0;

[Copilot]

There is redundant handling of app activation. Both the onChange(of: scenePhase) modifier (line 28-32) and the onReceive UIApplication.didBecomeActiveNotification (line 34-36) will trigger videoPlayer.play() when the app becomes active. This can cause the play() method to be called twice unnecessarily. Consider removing one of these handlers or consolidating the logic.

Suggested change

	#if canImport(UIKit)
	.onReceive(NotificationCenter.default.publisher(for: UIApplication.didBecomeActiveNotification)) { _ in
	videoPlayer.play()
	}
	#endif