fix: Remove ports in assist node

[typenoob]

Simply移除了辅助节点指向中心的连接桩。
该辅助节点为交互式创建新的边时，未完成创建动作前，新创建边的终点。
我认为当一个节点作为边的终点时，这个节点没有连接桩与有一个指向中心的连接桩，是等价的。
If It's true, then this fix should be safe.

BTW, #7581 也从报错的根源角度修复了这个问题。

close #7531

[gemini-code-assist]

Summary of Changes

Hello @typenoob, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the interactive edge creation process by eliminating the default central port from the assist node. The change is predicated on the understanding that for a temporary endpoint node, the presence of a central port is functionally redundant, thus simplifying its configuration and potentially resolving related issues. The author also notes that another PR, #7581, addresses the root cause of the problem this fix aims to mitigate.

Highlights

• Assist Node Port Removal: The central connection port has been removed from the assist node's style definition. This node serves as the temporary endpoint during interactive edge creation, and the change is based on the assumption that a temporary endpoint node functions identically whether it has a central port or no port at all.

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[gemini-code-assist]

Code Review

本次变更移除了在创建边时使用的辅助节点上的连接桩（ports）定义。根据您的描述，移除这��指向中心的连接桩是安全的，因为当节点没有连接桩时，边默认会连接到节点中心，这与之前的行为等价。该改动简化了辅助节点的样式配置，移除了冗余代码，从而提高了代码的可读性和可维护性。整体来看，这是一个不错的优化。