202 feature sync user role

[minsun-0209]

🍎 개요

• 디스코드 학생회 역할 동기화 이후 앱 내에서 기존 access token 및 권한 캐시(KeyChain)가 즉시 갱신되지 않아 기존 화면이 유지되는 문제를 해결했습니다

📦 작업 내용

• GOMSRefreshToken.swift 토큰 재발급(reissue) 요청 시, 응답으로 받은 새로운 AccessToken의 JWT Payload를 디코딩하여 유저의 최신 권한을 authority 키체인에 즉시 동기화하도록 로직을 수정
• MainViewController.swift& AdminMainViewController.swift 앱 실행 및 포그라운드(Foreground) 재진입 시 viewWillAppear 시점에서 토큰 재발급 및 최신 권한 검사 함수(syncRoleAndFetch() )를 수행하고, 권한 변경이 감지되면 유저/어드민 메인 화면 간 자동 전환 처리가 이루어지도록 대응

🔀 :: #202

[gemini-code-assist]

Code Review

This pull request introduces role synchronization on view appearance in both AdminMainViewController and MainViewController by reissuing tokens, checking the user's profile role, and switching view controllers if the role has changed. It also updates GOMSRefreshToken to parse the role from the JWT payload and update the authority keychain. The review feedback highlights critical improvements: handling Base64URL encoding during JWT payload decoding to prevent decoding failures, removing redundant network calls in MainViewController, and adding a visibility guard check in AdminMainViewController before executing asynchronous UI and navigation updates.

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[Copilot]

Pull request overview

This PR addresses stale in-app permission state after Discord role sync by forcing a token reissue on app entry/foreground and ensuring the app immediately reflects updated user roles (student vs. student council) by switching between Main and Admin main screens.

Changes:

• Add role-sync flow on viewWillAppear for both user/admin main screens (syncRoleAndFetch()), including automatic screen switching when role changes.
• Update refresh-token reissue handling to decode the new access token’s JWT payload and immediately persist the latest role to the authority keychain entry.
• Replace direct fetchData() calls on entry with the new role-sync + fetch flow.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
Projects/Feature/Sources/Scene/Main/User/View/MainViewController.swift	Replaces entry-time data fetch with a token reissue + role check that can redirect to admin main.
Projects/Feature/Sources/Scene/Main/Admin/View/AdminMainViewController.swift	Adds token reissue + role check on entry that can redirect back to user main.
Projects/Feature/Sources/Extension/GOMSRefreshToken.swift	Parses role from newly issued access token and writes it into keychain immediately.

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