Bot Mode group chats were named once at creation and could never be
renamed, and rooms had no picture — only the fanned member faces.
- New Group Chat dialog: optional room picture (upload from device or
image.generate, same 256px normalize pipeline as bot avatars).
- Room header: gear button opens Group settings — rename the group or
set/replace/remove the picture after creation.
- renameGroupChat re-keys the room record (log, watermarks, sessions,
members, picture), swaps the name in every local member's ui_meta
groups list, follows open views to the new name, and rejects
collisions instead of silently suffixing. Stored member sessions keep
resuming by sid, so no history is lost.
- Room picture persists in the durable room record, hydrates on window
load, and renders in the roster row (over the face pile), and the
room header.
Teknium
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