fix(workflow): line break not supported by Send Email Nodes

[abk404]

Closes #16557

Tiptap Editor (which the Send Email Node uses) , creates a content json with type 'hardBreak' for line breaks.

The was no rederer defined for this hardBreak node type, so the renderNode function was ignoring that node (returning null).

Fix : Added a renderer for hardBreak node type.

[greptile-apps]

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[Copilot]

Pull request overview

This PR fixes a bug where line breaks created in the Tiptap Editor were not being rendered in Send Email Nodes. The Tiptap Editor creates a 'hardBreak' node type for line breaks, but there was no renderer defined for this node type, causing it to be ignored.

• Added support for rendering Tiptap's hardBreak node type as HTML <br /> elements
• Registered the new HARD_BREAK node type constant in the shared Tiptap configuration
• Created a new renderer function that converts hardBreak nodes to React <br /> elements

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/twenty-shared/src/utils/tiptap/tiptap-marks.ts	Added HARD_BREAK constant to the TIPTAP_NODE_TYPES enum for consistency between frontend and email renderer
packages/twenty-emails/src/utils/email-renderer/renderers/render-node.tsx	Imported and registered the hardBreak renderer in the NODE_RENDERERS mapping
packages/twenty-emails/src/utils/email-renderer/nodes/hard-break.tsx	Implemented the hardBreak renderer function that returns a <br /> element

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[cubic-dev-ai]

No issues found across 3 files

[abk404]

Added test as coverage dropped below threshold.

[etiennejouan]

Hi @abk404 , Thank you for your contribution. It works fine 👏

[twenty-eng-sync]

Hey @etiennejouan! After you've done the QA of your Pull Request, you can mark it as done here. Thank you!

[github-actions]

Thanks @abk404 for your contribution!
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