[FIX] CardShredView 네비게이션 화면전환 적용 및 MainTabView 개선

GAMSS/Sources/Core/Components/Navigation/NavigationBarHider.swift

@@ -0,0 +1,99 @@
+//
+//  NavigationBarHider.swift
+//  GAMSS
+//
+//  Created by 이건준 on 8/24/26.
+//
+
+import SwiftUI
+
+/// NavigationStack 안의 시스템 네비게이션 바를 항상 숨긴다.
+/// 탭 바는 SwiftUI `.toolbar(.hidden, for: .tabBar)`로 처리해야 레이아웃이 전체 높이로 확장된다.
+struct NavigationBarHider: UIViewControllerRepresentable {
+    func makeCoordinator() -> Coordinator {
+        Coordinator()
+    }
+
+    func makeUIViewController(context: Context) -> UIViewController {
+        let controller = HostViewController()
+        controller.onAppear = { [weak coordinator = context.coordinator, weak controller] in
+            guard let controller else { return }
+            coordinator?.bind(from: controller)
+        }
+        context.coordinator.bind(from: controller)
+        return controller
+    }
+
+    func updateUIViewController(_ uiViewController: UIViewController, context: Context) {
+        context.coordinator.bind(from: uiViewController)
+    }
+
+    final class HostViewController: UIViewController {
+        var onAppear: (() -> Void)?
+
+        override func viewWillAppear(_ animated: Bool) {
+            super.viewWillAppear(animated)
+            onAppear?()
+        }
+    }
+
+    final class Coordinator: NSObject, UINavigationControllerDelegate {
+        private weak var navigationController: UINavigationController?
+        private weak var originalDelegate: UINavigationControllerDelegate?
+
+        func bind(from controller: UIViewController) {
+            DispatchQueue.main.async { [weak self, weak controller] in
+                guard let self, let navigationController = controller?.navigationController else { return }
+
+                if self.navigationController !== navigationController {
+                    self.originalDelegate = navigationController.delegate
+                    self.navigationController = navigationController
+                    navigationController.delegate = self
+                }
+
+                self.hideNavigationBar(on: navigationController)
+            }
+        }
+
+        func navigationController(
+            _ navigationController: UINavigationController,
+            willShow viewController: UIViewController,
+            animated: Bool
+        ) {
+            hideNavigationBar(on: navigationController)
+            originalDelegate?.navigationController?(
+                navigationController,
+                willShow: viewController,
+                animated: animated
+            )
+        }
+
+        func navigationController(
+            _ navigationController: UINavigationController,
+            didShow viewController: UIViewController,
+            animated: Bool
+        ) {
+            hideNavigationBar(on: navigationController)
+            originalDelegate?.navigationController?(
+                navigationController,
+                didShow: viewController,
+                animated: animated
+            )
+        }
+
+        private func hideNavigationBar(on navigationController: UINavigationController) {
+            navigationController.setNavigationBarHidden(true, animated: false)
+            // UIKit으로 탭바를 숨기면 하단 여백이 남을 수 있어, 탭바는 SwiftUI toolbar로만 제어한다.
+            if navigationController.viewControllers.count <= 1 {
+                navigationController.tabBarController?.tabBar.isHidden = false
+            }
+        }
+    }
+}
+
+extension View {
+    /// push된 화면에서 탭바를 숨기고 콘텐츠가 전체 높이를 쓰도록 한다.
+    func hidesTabBar() -> some View {
+        toolbar(.hidden, for: .tabBar)
+    }
+}

GAMSS/Sources/Core/Components/Navigation/NavigationBarView.swift

@@ -0,0 +1,181 @@
+//
+//  NavigationBarView.swift
+//  GAMSS
+//
+//  Created by 이건준 on 8/31/26.
+//
+
+import SwiftUI
+
+enum NavigationBarMetrics {
+    static let height: CGFloat = 64
+    static let horizontalPadding: CGFloat = Spacing.spacing350
+}
+
+/// 시스템 NavigationBar 대신 쓰는 공용 상단 바.
+struct NavigationBarView<Trailing: View>: View {
+    enum TitlePlacement {
+        case leading
+        case center
+    }
+
+    enum LeadingContent {
+        case backButton
+        case logo
+        case none
+    }
+
+    private let title: String?
+    private let titlePlacement: TitlePlacement
+    private let titleStyle: Typography
+    private let titleColor: Color
+    private let leadingContent: LeadingContent
+    private let onBack: () -> Void
+    private let horizontalPadding: CGFloat
+    private let trailing: Trailing
+
+    init(
+        title: String? = nil,
+        titlePlacement: TitlePlacement = .leading,
+        titleStyle: Typography = .subtitle2,
+        titleColor: Color = .colorGray900,
+        leading: LeadingContent = .backButton,
+        onBack: @escaping () -> Void = {},
+        horizontalPadding: CGFloat = NavigationBarMetrics.horizontalPadding,
+        @ViewBuilder trailing: () -> Trailing = { EmptyView() }
+    ) {
+        self.title = title
+        self.titlePlacement = titlePlacement
+        self.titleStyle = titleStyle
+        self.titleColor = titleColor
+        self.leadingContent = leading
+        self.onBack = onBack
+        self.horizontalPadding = horizontalPadding
+        self.trailing = trailing()
+    }
+
+    init(
+        title: String? = nil,
+        titlePlacement: TitlePlacement = .leading,
+        titleStyle: Typography = .subtitle2,
+        titleColor: Color = .colorGray900,
+        showsBackButton: Bool,
+        onBack: @escaping () -> Void = {},
+        horizontalPadding: CGFloat = NavigationBarMetrics.horizontalPadding,
+        @ViewBuilder trailing: () -> Trailing = { EmptyView() }
+    ) {
+        self.init(
+            title: title,
+            titlePlacement: titlePlacement,
+            titleStyle: titleStyle,
+            titleColor: titleColor,
+            leading: showsBackButton ? .backButton : .none,
+            onBack: onBack,
+            horizontalPadding: horizontalPadding,
+            trailing: trailing
+        )
+    }
+
+    var body: some View {
+        Group {
+            switch titlePlacement {
+            case .leading:
+                leadingLayout
+            case .center:
+                centerLayout
+            }
+        }
+        .frame(height: NavigationBarMetrics.height)
+        .padding(.horizontal, horizontalPadding)
+    }
+
+    private var leadingLayout: some View {
+        HStack(spacing: Spacing.spacing200) {
+            leadingView
+
+            if let title {
+                Text(title)
+                    .typography(titleStyle)
+                    .foregroundStyle(titleColor)
+            }
+
+            Spacer(minLength: 0)
+
+            trailing
+        }
+    }
+
+    private var centerLayout: some View {
+        ZStack {
+            if let title {
+                Text(title)
+                    .typography(titleStyle)
+                    .foregroundStyle(titleColor)
+            }
+
+            HStack(spacing: Spacing.spacing200) {
+                leadingView
+
+                Spacer(minLength: 0)
+
+                trailing
+            }
+        }
+    }
+
+    @ViewBuilder
+    private var leadingView: some View {
+        switch leadingContent {
+        case .backButton:
+            Button(action: onBack) {
+                Image(systemName: "chevron.left")
+                    .foregroundStyle(Color.colorGray900)
+            }
+            .accessibilityLabel("뒤로가기")
+
+        case .logo:
+            Image("logoGamss")
+                .resizable()
+                .scaledToFit()
+                .frame(height: 24)
+
+        case .none:
+            EmptyView()
+        }
+    }
+}
+
+#Preview("Push") {
+    VStack {
+        NavigationBarView(title: "설정", onBack: {})
+        NavigationBarView(title: "보관함", onBack: {}) {
+            Text("비우기")
+                .typography(.body5Medium)
+                .foregroundStyle(Color.colorGray900)
+        }
+    }
+}
+
+#Preview("Tab logo") {
+    NavigationBarView(leading: .logo) {
+        Image("gear")
+            .resizable()
+            .scaledToFit()
+            .frame(width: 24, height: 24)
+    }
+}
+
+#Preview("Center") {
+    NavigationBarView(
+        title: "2026.08.31",
+        titlePlacement: .center,
+        titleStyle: .subtitle3,
+        titleColor: .colorGray950,
+        onBack: {}
+    ) {
+        HStack(spacing: Spacing.spacing400) {
+            Image("iconCardGenerate")
+            Image("iconTokenUsage")
+        }
+    }
+}

GAMSS/Sources/Core/LoginSession.swift

@@ -0,0 +1,22 @@
+//
+//  LoginSession.swift
+//  GAMSS
+//
+//  Created by 이건준 on 8/12/26.
+//
+
+import Foundation
+
+@Observable
+@MainActor
+final class LoginSession {
+    static let shared = LoginSession()
+
+    var value: LoginState = .current
+
+    private init() {}
+
+    func updateFromStorage() {
+        value = .current
+    }
+}

GAMSS/Sources/Core/LoginState.swift

@@ -10,7 +10,7 @@ import Foundation
 enum LoginState {
     /// 로그인 안되어 있음
     case notLoggedIn
-    /// 자동 로그인 설정이 되어있음, accessToken 갱신 필요
+    /// 자동 로그인 대기
     case autoLoginPending
     /// 로그인 되어있음
     case loggedIn

GAMSS/Sources/Core/Network/NetworkManager.swift

@@ -10,10 +10,20 @@ import Foundation
 protocol NetworkRequesting {
     func request<T: Decodable & Sendable>(
         _ endpoint: Endpoint,
-        responseType: T.Type
+        responseType: T.Type,
+        isRetryAfterReissue: Bool
     ) async throws -> T
 }
 
+extension NetworkRequesting {
+    func request<T: Decodable & Sendable>(
+        _ endpoint: Endpoint,
+        responseType: T.Type
+    ) async throws -> T {
+        try await request(endpoint, responseType: responseType, isRetryAfterReissue: false)
+    }
+}
+
 final class NetworkManager: NetworkRequesting {
     static let shared = NetworkManager()
 
@@ -28,15 +38,6 @@ final class NetworkManager: NetworkRequesting {
         self.decoder = decoder
     }
 
-    func request<T: Decodable & Sendable>(
-        _ endpoint: Endpoint,
-        responseType: T.Type
-    ) async throws -> T {
-        try await request(endpoint, responseType: responseType, isRetryAfterReissue: false)
-    }
-
-    /// `isRetryAfterReissue`가 true면 이미 한 번 토큰을 재발급받고 재시도하는 중이라는 뜻 —
-    /// 여기서 또 EXPIRED_TOKEN이 나도 다시 재발급을 시도하지 않는다(무한 루프 방지).
     func request<T: Decodable & Sendable>(
         _ endpoint: Endpoint,
         responseType: T.Type,
@@ -68,14 +69,16 @@ final class NetworkManager: NetworkRequesting {
 
             if response.statusCode == 401, !isRetryAfterReissue {
                 do {
-                    try await TokenStorage.shared.reissueToken()
+                    try await TokenStorage.shared.restoreSession()
                 } catch {
-                    Log.error("Token reissue failed: \(error)")
+                    Log.error("Session restore failed: \(error)")
+                    TokenStorage.shared.clearSession()
+                    await MainActor.run {
+                        LoginSession.shared.updateFromStorage()
+                    }
                     throw NetworkError.expiredToken
                 }
 
-                // 재발급된 토큰은 HttpHeader가 요청을 다시 만들 때 Keychain에서 새로 읽어오므로,
-                // 원래 요청을 그대로 한 번 더 시도하면 된다.
                 return try await request(endpoint, responseType: responseType, isRetryAfterReissue: true)
             }