Alexander Onnikov

 Issue has undefined prefix instead of UBERF when searching it in mentions / spotlight. See [undefined-4746](https://front.hc.engineering/browse/?workspace=platform&_class=tracker%3Aclass%3AIssue&_id=6589b5bf8b2d426c350b7207&label=undefined-4746)

Expose connect method in the server API

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We have `connect` method used for connecting to the server in several services. The method is almost the same. We need to get rid of duplicated code.

We want to use collaborative editors in more places in the system, not only for collaborative documents. Some of places are - descriptions of objects.

When a table is positioned in the end of document I cannot add any text after the table, the text is added on the right side of table instead. ...

Tiptap gapcursor plugin does not work well with collaboration

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When gapcursor is used, then collaborative plugins show runtime errors. Steps to reproduce: 1. Open a document 2. Add a table to the end of document 3. Move cursor below...

Implement token validation in collaborator in order to prevent access to resources users should not have access to. Example:

There is an error occurs when document is destroyed in collaborator editor: > headings.ts:43 ReferenceError: docChanged is not defined

# Contribution checklist ## Brief description ## Checklist * [ ] - UI test added to added/changed functionality? * [ ] - Screenshot is added to PR if applicable ?...