feat(router): add minMargin option to rightAngle router to suppress margin-overlap detours

[Geliogabalus]

Summary

• Introduce a minMargin option to rightAngleRouter
• Pass minMargin through to every routeBetweenPoints call (all four anchor-side combinations: top→bottom, bottom→top, left→right, right→left)
• Inside routeBetweenPoints, derive ignoreOverlappingMargin = (sourceMargin + targetMargin) - 2 * minMargin — when the margin zones of two adjacent elements overlap by at most this threshold the router skips the detour-around-margin logic and routes directly between the anchors
• Add a right-angle-playground-js example that demonstrates the option in action

Test plan

• Verify that links between horizontally adjacent elements (left/right anchors) no longer detour around margin zones when minMargin is set and the margin overlap is within the threshold
• Verify the same for vertically adjacent elements (top/bottom anchors)
• Verify that routes still correctly route around margin zones when the overlap exceeds the threshold
• Verify that omitting minMargin (default null) preserves existing routing behaviour

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds a new minMargin option to the rightAngle router to reduce unnecessary “detour around margin” routes when elements are adjacent and their margin zones only minimally overlap, and introduces a new JS playground example to demonstrate the behavior.

Changes:

• Add minMargin option to rightAngleRouter and thread it through all routeBetweenPoints calls.
• Add “ignore overlapping margin” logic in routeBetweenPoints for opposite-side routing cases.
• Add a new examples/right-angle-playground-js workspace demo (and lockfile entry).

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
yarn.lock	Adds the new @joint/demo-right-angle-playground-js workspace entry.
packages/joint-core/src/routers/rightAngle.mjs	Implements minMargin option and new margin-overlap suppression logic.
examples/right-angle-playground-js/src/styles.css	Styling for the new playground demo.
examples/right-angle-playground-js/src/main.js	Demo setup showcasing rightAngle routing with minMargin.
examples/right-angle-playground-js/package.json	Declares the new example workspace package and its scripts/deps.
examples/right-angle-playground-js/index.html	HTML entrypoint for the new Vite demo.

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