Document Linux native title bar setting and mailto Copy Email Address

[Combs7th]

Documents two end-user-facing Mattermost Desktop App v6.2.0 changes:

• Linux-only Use native title bar setting ([MM-60442] Add setting to enable native window decorations on Linux desktop#3672).
• Copy Email Address right-click action on mailto: links ([MM-68285] Add a Copy Email Address menu item for mailto: links desktop#3777).

Version and UI strings are verified against PR evidence supplied in #8961. Alt-key popout behavior from #3672 intentionally omitted — add as follow-up if docs team wants it.

Refs #8961

Generated with Claude Code

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[github-actions]

Newest code from mattermost has been published to preview environment for Git SHA aaa761d

[Combs7th]

Hey @devinbinnie - I have a first docs pass up for the Desktop App end-user updates:

Could you take a quick look and confirm the wording is accurate for the Linux-only Use native title bar setting and the Copy Email Address action for mailto: links?

I left out the Alt-key popout menu note for now since it felt a little edge-case, but let me know if you think users need that documented too. Thanks!

[devinbinnie]

LGTM! Thanks @Combs7th!

[Combs7th]

@esethna - Ready for merge.