feat: sharpen chat experiences (#9)

* feat: add global account and refactor chat registry

* chore: improve last seen

* chore: reduce string alloc

* wip: refactor room

* chore: fix edit profile panel

* chore: refactor open window in main

* chore: refactor sidebar

* chore: refactor room

crates/app/Cargo.toml

@@ -13,6 +13,7 @@ ui = { path = "../ui" }
 common = { path = "../common" }
 state = { path = "../state" }
 chats = { path = "../chats" }
+account = { path = "../account" }
 
 gpui.workspace = true
 reqwest_client.workspace = true