fix: 隐藏画布根节点的包裹元素的操作选项

[gene9831]

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PR

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] The commit message follows our Commit Message Guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)
• [ ] Built its own designer, fully self-validated

PR Type

What kind of change does this PR introduce?

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes
• [ ] Other... Please describe:

Background and solution

pr #259 合并后，画布根节点使用div包裹了一层，来自定义根节点的样式

What is the current behavior?

当根节点样式设置了margin时，选中根节点div会展示出操作选项，实际上这些操作选项是无效的。（根节点无法移动、复制、删除）

What is the new behavior?

隐藏根节点div的操作选项

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Other information

Summary by CodeRabbit

• New Features
  • Enhanced the canvas component to improve condition checks for better action visibility.
  • Added a unique identifier to the root container in the rendering logic for improved node selection.