chore: import upstream snapshot with attribution

shortcuts/sheets/backward/sheets_errors.go

@@ -0,0 +1,15 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package backward
+
+import "github.com/larksuite/cli/errs"
+
+// wrapSheetsNetworkErr preserves typed boundary errors and only classifies raw
+// transport failures that still surface from stream/download paths.
+func wrapSheetsNetworkErr(err error, format string, args ...any) error {
+	if _, ok := errs.ProblemOf(err); ok {
+		return err
+	}
+	return errs.NewNetworkError(errs.SubtypeNetworkTransport, format, args...).WithCause(err)
+}