dotbot: one DotBot panel; the account a conversation runs on is a setting in it (the composer's account chip), several accounts of a provider connect side by side, each can be switched to, renamed, signed in again or disconnected without a restart, Connect in Connected accounts starts that account's sign-in, a spent window names the accounts with room (zero #18563 #18564 #18565 #18147); plugin.wasm built from DotBot build/zero-plugin-18563 (7bddf856: build/zero-plugin-508-review 2a9da608 + DotBot #543)