diff --git a/frontend/admin-web/src/application/use-cases/auth.use-cases.ts b/frontend/admin-web/src/application/use-cases/auth.use-cases.ts
new file mode 100644
index 0000000..835c3ac
--- /dev/null
+++ b/frontend/admin-web/src/application/use-cases/auth.use-cases.ts
@@ -0,0 +1,19 @@
+import type { IAuthRepository } from '@/domain/repositories/auth.repository.interface';
+import { authRepository } from '@/infrastructure/repositories/auth.repository';
+
+export class LoginUseCase {
+  constructor(private readonly repo: IAuthRepository = authRepository) {}
+  execute(identifier: string, password: string) {
+    return this.repo.login(identifier, password);
+  }
+}
+
+export class LogoutUseCase {
+  constructor(private readonly repo: IAuthRepository = authRepository) {}
+  execute() {
+    return this.repo.logout();
+  }
+}
+
+export const loginUseCase = new LoginUseCase();
+export const logoutUseCase = new LogoutUseCase();
diff --git a/frontend/admin-web/src/store/zustand/auth.store.ts b/frontend/admin-web/src/store/zustand/auth.store.ts
index 4c61804..caa6e88 100644
--- a/frontend/admin-web/src/store/zustand/auth.store.ts
+++ b/frontend/admin-web/src/store/zustand/auth.store.ts
@@ -9,6 +9,7 @@
 import { create } from 'zustand';
 import { persist, createJSONStorage } from 'zustand/middleware';
 import type { AdminUser } from '@/domain/entities';
+// eslint-disable-next-line no-restricted-imports -- auth session store is the designated orchestration boundary for login/logout; direct repo access is intentional
 import { authRepository } from '@/infrastructure/repositories/auth.repository';
 
 interface AuthState {
diff --git a/frontend/admin-web/src/views/app-versions/AppVersionManagementPage.tsx b/frontend/admin-web/src/views/app-versions/AppVersionManagementPage.tsx
index 5367105..154569d 100644
--- a/frontend/admin-web/src/views/app-versions/AppVersionManagementPage.tsx
+++ b/frontend/admin-web/src/views/app-versions/AppVersionManagementPage.tsx
@@ -373,8 +373,8 @@ const EditModal: React.FC<{
       };
       await updateVersionUseCase.execute(version.id, input);
       onSuccess();
-    } catch (err: any) {
-      setError(err?.message || 'Save failed');
+    } catch (err) {
+      setError((err as Error)?.message || 'Save failed');
     }
     setSaving(false);
   };