Wire up stop button in claude threads (#34839)

Release Notes:

- N/A

---------

Co-authored-by: Ben Brandt <benjamin.j.brandt@gmail.com>

crates/agent_servers/Cargo.toml

@@ -37,10 +37,15 @@ strum.workspace = true
 tempfile.workspace = true
 ui.workspace = true
 util.workspace = true
+uuid.workspace = true
 watch.workspace = true
 which.workspace = true
 workspace-hack.workspace = true
 
+[target.'cfg(unix)'.dependencies]
+libc.workspace = true
+nix.workspace = true
+
 [dev-dependencies]
 env_logger.workspace = true
 language.workspace = true