Rail: a room — open, mark as read, mute / unmute notifications (per browser,
the unread count still shows), copy name, group settings, leave; the pet and
+ — chat with the pet, new chat, mark all chats as read. A message — copy
text, reply (quotes it into the box), message the sender privately (group),
delete your own (asks first). A file — open in a new tab, download, copy file
name. A group member — message privately, copy name, remove (the creator).
DELETE /api/chat/rooms/:id/messages/:messageId deletes the caller's OWN text
message and its files (403 for anyone else, an admin included) and tells the
members with a chat_deleted frame (exactAudience).
Server mode: a rail beside the pet's chat lists the pet, then the user's
direct chats (one per pair) and groups with unread counts, and + for a new
chat. A room shows its messages (group senders named), loads older pages,
and sends text, pasted / dropped / attached files (<= 10 x 25 MB; images
inline). A group's creator renames it and adds or removes people; anyone may
leave. A blue dot on the pet counts unread messages.
Only a room's members read or write it, an admin included (roomFor → 404).
Files are stored under server-made names in <data dir>/chat/<room>/ and
served to members only under a sandbox CSP + nosniff. chat_message /
chat_room frames reach exactly the ids in `to` (scope.exactAudience).
New tables chat_rooms / chat_members / chat_messages / chat_files (additive).
nntrivi2001