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/chats/Cargo.toml

@@ -13,5 +13,6 @@ nostr-sdk.workspace = true
 anyhow.workspace = true
 itertools.workspace = true
 chrono.workspace = true
+smallvec.workspace = true
 smol.workspace = true
 oneshot.workspace = true