Change the node shape globally

### Feature Idea

Can you please add an option in the default settings to change the node shape (box, round, card) globally? Currently, this is only possible by modifying the JSON style, which requires a lot of manual work. Since we already can change the shape of connection lines globally, why not allow global node-shape changes as well? Thank you.

### Existing Solutions

_No response_

### Other

_No response_

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*This issue is transferred from: https://github.com/comfyanonymous/ComfyUI/issues/10964*

Original issue was created by @Kinasa0096 at 2025-11-28T15:16:48.000Z

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-7031-Change-the-node-shape-globally-2b96d73d365081c6b48acfcdee7ed116) by [Unito](https://www.unito.io)

Start by locating the default settings and the existing global connection-line shape option, then trace how those settings reach node rendering. The work is done when box, round, and card node shapes can be selected globally without manually editing each node's JSON style.

Written by the indexing model from the issue text.