Please add the function: adjust the thickness and transparency of the connecting line of the node

### What problem are you experiencing?

When there are many nodes, if the connection line of the node is too thick, it will obscure the node/

### When does this problem occur?

.

### How often do you encounter this problem?

Multiple times per day

### How much does this problem affect your workflow?

Blocks me from completing tasks

### Current workarounds

_No response_

### Ideas for solutions (Optional)

_No response_

### Additional context

_No response_

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-9624-Please-add-the-function-adjust-the-thickness-and-transparency-of-the-connecting-line--31d6d73d365081d9863cf5092abe80cd) by [Unito](https://www.unito.io)