feat(connector): add jumpDirection option to jumpover connector

[ylcr003]

📝 Description

Add a new jumpDirection option to the jumpover connector to control which line orientation produces the jump arc at intersections.

• 'both' (default) — existing behavior, unchanged
• 'horizontal' — only horizontal lines jump over crossing vertical lines
• 'vertical' — only vertical lines jump over crossing horizontal lines

🖼️ Screenshot

jumpDirection: 'both' (default)	jumpDirection: 'horizontal'
Both directions may produce arcs	Only horizontal lines arc

💡 Motivation and Context

In some business scenarios (e.g. orthogonal routing graphs), it is visually cleaner to always have horizontal lines jump over vertical lines, rather than letting the arc appear on whichever line was drawn later (index-based). This option gives users explicit control over which line direction is responsible for the jump arc.

New API:

graph.addEdge({
  connector: {
    name: 'jumpover',
    args: {
      jumpDirection: 'horizontal', // 'both' | 'horizontal' | 'vertical'
    },
  },
})

[gemini-code-assist]

Code Review

This pull request introduces a jumpDirection option to the jumpover connector, allowing users to specify whether jump arcs should be applied to horizontal, vertical, or both types of lines. The update includes the core logic implementation, a new demonstration page in the examples, and unit tests. Feedback points out a bug in the deduplication logic that could prevent arcs from appearing when using specific direction settings and suggests correcting the UI description in the example to accurately reflect that the later-drawn edge produces the jump arc.

[ylcr003]

实际遇到了这样的业务场景，所以提个PR，给广大牛马提供一点帮助和便捷