ProfilesWindow and SessionWindow were two independent top-level windows,
coordinated through a QPointer and manual show/create-or-reuse logic, with
duplicated Help menus and a path where Quit didn't actually quit if a
SessionWindow happened to be open. ProfilesWindow is now an embedded QWidget
shown as a permanent, unclosable "Profiles" tab inside SessionWindow's tab
widget; SessionWindow is the app's sole top-level window. Double-clicking a
profile opens a session tab in the same window instead of finding-or-creating
a second one, and closing all session tabs falls back to the Profiles tab
rather than closing the app.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
ksmithandClaude Sonnet 5