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/stores/session-store.ts

@@ -75,6 +75,7 @@ export interface AgentRuntimeInfo {
   sessionId: string | null;
   model?: string | null;
   modeId?: string | null;
+  thinkingOptionId?: string | null;
   extra?: Record<string, unknown>;
 }