fix(card): avoid cloning Fragment children

[wanxiankai]

Motivation

Card and Card.Actions clone their valid element children to add layout metadata and action styling. React Fragments only accept key and children, so cloning a Fragment with index, total, siblings, borderRadiusStyles, compact, mode, or style produces invalid-prop warnings or runtime errors.

This change leaves Fragment children untouched while preserving the existing prop injection for regular Card children. It also adds regression coverage for both the top-level Card and nested Card.Actions paths reported in the issue.

Related issue

Fixes #4710

Test plan

• yarn test --runInBand --watchman=false — 55 suites passed; 734 tests passed, 1 skipped; 169 snapshots passed
• yarn typecheck
• yarn lint
• yarn prepack

The regression tests render Fragment children through Card and Card.Actions, verify their content remains visible, and verify that Card-specific props are not added to the Fragment.