Conversation threads (1:1 and group) live under Unterhaltungen with the
group-start action. Projekte keeps thematic project creation only; thread
lists no longer split across Team and Projekte.
Co-authored-by: cynarAI <cynarAI@users.noreply.github.com>
Group chats are not project actions. Start a group conversation is now a
top-level sidebar row between Heute and Projekte; Projekte empty state and
header plus focus on creating projects instead.
Co-authored-by: cynarAI <cynarAI@users.noreply.github.com>