revert: rollback Fluent UI and Blazor homepage to last successful state (3be3794)

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();
@@ -115,14 +115,13 @@ public class CustomAuthenticationStateProvider : AuthenticationStateProvider
     private bool ShouldRefreshToken()
     {
         // 토큰이 5분 이내로 만료되면 갱신 (300초 = 5분)
-        var tokenExpiryTicks = _tokenStore.TokenExpiryTicks;
-        if (tokenExpiryTicks is null || tokenExpiryTicks <= 0)
+        if (_tokenStore.TokenExpiryTicks <= 0)
             return false;
 
         const int refreshThresholdSeconds = 300;
         try
         {
-            var expiryTime = new DateTime(tokenExpiryTicks.Value, DateTimeKind.Utc);
+            var expiryTime = new DateTime((long)_tokenStore.TokenExpiryTicks, DateTimeKind.Utc);
             var timeUntilExpiry = expiryTime - DateTime.UtcNow;
             return timeUntilExpiry.TotalSeconds <= refreshThresholdSeconds && timeUntilExpiry.TotalSeconds > 0;
         }
@@ -145,4 +144,17 @@ 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;
+        }
+    }
 }