refactor: admin ui를 fluent v5와 html 기반으로 전환

TaxBaik.Web/Services/CustomAuthenticationStateProvider.cs

@@ -79,7 +79,7 @@ public class CustomAuthenticationStateProvider : AuthenticationStateProvider
                 }
             }
 
-            var principal = _authService.ValidateToken(accessToken);
+            var principal = _authService.ValidateToken(accessToken!);
             if (principal == null)
             {
                 await LogoutAsync();
@@ -115,13 +115,14 @@ public class CustomAuthenticationStateProvider : AuthenticationStateProvider
     private bool ShouldRefreshToken()
     {
         // 토큰이 5분 이내로 만료되면 갱신 (300초 = 5분)
-        if (_tokenStore.TokenExpiryTicks <= 0)
+        var tokenExpiryTicks = _tokenStore.TokenExpiryTicks;
+        if (tokenExpiryTicks is null || tokenExpiryTicks <= 0)
             return false;
 
         const int refreshThresholdSeconds = 300;
         try
         {
-            var expiryTime = new DateTime((long)_tokenStore.TokenExpiryTicks, DateTimeKind.Utc);
+            var expiryTime = new DateTime(tokenExpiryTicks.Value, DateTimeKind.Utc);
             var timeUntilExpiry = expiryTime - DateTime.UtcNow;
             return timeUntilExpiry.TotalSeconds <= refreshThresholdSeconds && timeUntilExpiry.TotalSeconds > 0;
         }
@@ -144,17 +145,4 @@ public class CustomAuthenticationStateProvider : AuthenticationStateProvider
         NotifyAuthenticationStateChanged(GetAuthenticationStateAsync());
     }
 
-    private bool IsTokenExpired(string token)
-    {
-        try
-        {
-            var handler = new JwtSecurityTokenHandler();
-            var jwtToken = handler.ReadJwtToken(token);
-            return jwtToken.ValidTo < DateTime.UtcNow;
-        }
-        catch
-        {
-            return true;
-        }
-    }
 }