feat(auth): improve unauthorized error handling for refresh and auto-refresh

- Added `isUnauthorizedError` and `hasUnauthorizedAuthFailure` to classify and handle unauthorized errors.
- Introduced `refreshErrorFromError` to map errors to standardized unauthorized responses.
- Modified refresh logic to stop auto-refresh retries for unauthorized errors.
- Updated tests to verify unauthorized error handling and refresh retry prevention.

internal/runtime/executor/helps/home_refresh_test.go

@@ -0,0 +1,15 @@
+package helps
+
+import (
+	"net/http"
+	"testing"
+)
+
+func TestStatusFromHomeErrorCodeMapsAuthenticationErrorToUnauthorized(t *testing.T) {
+	if got := statusFromHomeErrorCode("authentication_error"); got != http.StatusUnauthorized {
+		t.Fatalf("statusFromHomeErrorCode(authentication_error) = %d, want %d", got, http.StatusUnauthorized)
+	}
+	if got := statusFromHomeErrorCode("unauthorized"); got != http.StatusUnauthorized {
+		t.Fatalf("statusFromHomeErrorCode(unauthorized) = %d, want %d", got, http.StatusUnauthorized)
+	}
+}