Description

Simple tab feature integrated with the current history. This is a minimal usable version of this feature. More features may be added.

Issue (opened by me):
#4030
(fork feature is not added)

Related issues:
#774
#1858

Checklist

• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

Screenshots

Will provide image in a comment.

Testing instructions

The following user actions are handled:

• User can add new tabs
• User can close tabs, but it makes sure at least one tab is opened.
• User can open existing history
• Tab name is updated upon changing the session name
• Adding new session in other way like Cmd+L or Cmd+Shit+L also adds new tab, clicking last session goes back to the previously opened tab.

Missing:

• For a new tab, session name not updated before the user changes tabs
• Model name is not assigned to the current tab - if you change model name on one tab, it will be the same on every other tabs too.

Implementation notes:

• A single TabBar component is added, and a tabsSlice redux slice.
• The existing Chat component is not changed, only new session, load session, save session is called to imitate tab changing.