feat(via app): LaText Support

[rimzzlabs]

What problem does this solve?

Full control over the document

Proposed solution

LaText Support. If we have LaTex support, it would be great

Alternatives considered

No response

Which layer does this touch?

Editor experience (no change to the document itself)

Before submitting

• I searched existing issues and this hasn't been requested yet.
• This request doesn't add structural freedom that breaks ATS parseability (tables, columns, floating elements, decorative icons in text), and doesn't require accounts or server-side storage.