Add slash commands for ending and restarting agents (#1034)

* Add slash commands for ending agents

* Stabilize slash command e2e submit

* Unslop client slash command draft setup

* Fix slash commands while agent is running

* Fix slash command submit race

* Reshape client slash command execution

* Fix slash command tab cleanup

packages/app/src/hooks/use-agent-commands-query.ts

@@ -4,7 +4,7 @@ import type { AgentProvider } from "@server/server/agent/agent-sdk-types";
 
 const COMMANDS_STALE_TIME = 60_000; // Commands rarely change, cache for 1 minute
 
-interface AgentSlashCommand {
+export interface AgentSlashCommand {
   name: string;
   description: string;
   argumentHint: string;