Created email editor component

[9larsons]

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This PR creates a new KoenigEmailEditor component. For now, having this component serves two purposes:

• document how the email editor is expected to be used (e.g. which plugins are required, given the EMAIL_NODES
• cleans up the code in the Demo App a bit

Note: I also opted to remove the AsideNode — without the slash card menu, it doesn't make sense to include since there's no way to add them.

[coderabbitai]

Walkthrough

Introduces a new KoenigEmailEditor React component (wraps KoenigComposableEditor with specific config and plugins) and adds it to the package public API. DemoApp.jsx now uses KoenigEmailEditor for the email editor path instead of KoenigComposableEditor. The package public exports were updated to include KoenigEmailEditor and remove ListPlugin, ReplacementStringsPlugin, and EMAIL_TRANSFORMERS. Email node definitions were changed to remove AsideNode from EMAIL_NODES. An e2e test (email-editor.test.js) was adjusted so the horizontal rule shortcut triggers on --- (no trailing space).

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Created email editor component' accurately describes the main change: introducing a new KoenigEmailEditor component as a reusable email editor with a fixed plugin set.
Description check	✅ Passed	The pull request description accurately describes the creation of KoenigEmailEditor component and explains its purposes: documenting email editor usage and cleaning up the Demo App code.

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✨ Finishing touches

• 📝 Generate docstrings

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Review ran into problems

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[cmraible]

@troyciesco this is ready for review!

Since we're opting to not include the slash menu, I didn't think it made sense to keep the button, callout and aside nodes since there's no way to add them at the moment.