Case settings gains a "Default session group" selector (Ungrouped plus every
named tab group of the owner). A new session of the case lands in that group
in the same versioned layout write that registers it, so it is drawn in place
with no Ungrouped-to-group jump.
- Stored per owner and case in state.json (caseDefaultGroups), as the group's
stable id or null for Ungrouped; read and written only through
TabLayoutService under the owner lock.
- Precedence in sessionCreated: explicit tabGroupId, then the parent
placement, then the case default, else Ungrouped. A deleted or foreign id
never fails a spawn and is forgotten only after the creating write lands.
- POST /api/quick-start (local, linked, remote, Docker) and
/api/ralph-loop/start pass their case; POST /api/sessions infers it
lexically from workingDir. The create response carries tabLayout when a
case default placed the session.
- GET/PUT /api/cases/:name/default-group; deleting a case (or an admin
deleting a user's case folder) forgets the value.
- The selector mirrors desktop and phone, reverts on a refused save, and is
redrawn from every adopted tab layout; zh-CN strings added.
Aamer Akhter
74c980413a