feat(wrap-stream-in-html): adds a gradient on highlighted edges

[sverweij]

Description

• adds a gradient on highlighted edges (that appear on hover or on right click)

Motivation and Context

This makes it easier to distinguish the 'from' and 'end' parts of the edge

How Has This Been Tested?

• green ci
• eyeballs x examples

Screenshots

After

Before

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Documentation only change
• Refactor (non-breaking change which fixes an issue without changing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• 📖

  • My change doesn't require a documentation update, or ...
  • it does and I have updated it

• ⚖️

  • The contribution will be subject to The MIT license, and I'm OK with that.
  • The contribution is my own original work.
  • I am ok with the stuff in CONTRIBUTING.md.

[codeclimate]

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