Issues with the floating action box's position and unpin option when operating group box.

### Prerequisites

- [x] I am running the latest version of ComfyUI
- [x] I have searched existing issues to make sure this isn't a duplicate
- [x] I have tested with all custom nodes disabled ([see how](https://docs.comfy.org/troubleshooting/custom-node-issues#step-1%3A-test-with-all-custom-nodes-disabled))

### What happened?

My comfyui information:
ComfyUI 0.3.64
ComfyUI_frontend v1.27.10
EasyUse v1.3.4
ComfyUI-Manager V3.37
rgthree-comfy v1.0.2510052058

When I tried to unpin a group box, I encountered the following issues:
1. The floating action box only appears in a fixed position, which can be quite far away depending on the size of my workflow.

2. I can unpin individual nodes, but there's no unpin option for the background box surrounding the node.

### Steps to Reproduce

As mentioned above

### How is this affecting you?

Feature doesn't work as expected

### ComfyUI Frontend Version

1.27.10

### Browser

Edge

### Console Errors

```javascript

```

### Logs

```shell

```

### Additional Context

_No response_

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-5982-Issues-with-the-floating-action-box-s-position-and-unpin-option-when-operating-group-b-2866d73d3650818f9fe4cb2ddcd9af9a) by [Unito](https://www.unito.io)