fix: restore axis grid after visibility update

[xuefei1313]

🤔 This is a ...

• New feature
• Bug fix
• TypeScript definition update
• Performance optimization
• Test Case

💡 Background and solution

在关闭动画时，通过 updateSpec 将坐标轴网格的 visible 从 true 切换为 false 再恢复为 true，已有的 VRender grid component 可能已经从 product 上脱离。此前 ComponentMark 复用已有 component 时只更新 attributes，没有重新挂载，导致网格线无法恢复显示。

本修复在复用 component 时检查其 parent；仅当它已脱离当前 product 时重新 appendChild。同时增加左右坐标轴网格显隐切换的回归测试。公共 API 不变，正常已挂载路径不会增加额外生命周期操作。

📝 Changelog

Language	Changelog
🇺🇸 English	Restore existing axis grid graphics when visibility is enabled again through updateSpec with animation disabled.
🇨🇳 Chinese	修复关闭动画时通过 updateSpec 隐藏并重新显示坐标轴网格后，已有网格图元未恢复的问题。

☑️ Self-Check before Merge

• Doc is not needed
• Demo is not needed
• TypeScript definition update is not needed
• Changelog is provided

✅ Validation

• rushx test --runInBand __tests__/unit/core/update-effects.test.ts: 108/108 tests passed
• rushx compile: passed
• Pre-push rush test --only tag:package: VChart 74 suites / 382 tests passed; VUtils Extension 1/1 test passed
• ESLint on changed TypeScript files: 0 errors