This update makes the messaging framework available to the website live chat experience, laying groundwork for a future modernization of live chat behavior and interface. It also includes reliability fixes that prevent repeated service startup and avoid error loops when website assets are missing.

This commit make messaging service available in the frontend and in
the livechat external lib bundle.

This is preparation to refactoring JS livechat to use models and OWL.

*: bus, mail, survey, web, website_livechat

Task-2870899

The mail chat window header no longer includes controls for shifting a chat left or right. This simplifies the chat interface and reduces options that were likely unnecessary or confusing for users.

Task-2882557

The spreadsheet document action label was adjusted from “Save as Template” to “Save as template” for more consistent wording. This is a small user interface polish that helps keep menu and wizard text aligned across the Documents spreadsheet experience.

`Save as Template` => `Save as template`

task 2824232