feat(agent): render local interactive answers and fold completed process

src/features/agent/api/client.ts

@@ -78,6 +78,7 @@ export type AgentLoadedChatSession = AgentChatSessionSummary & {
 
 export type AgentSessionStreamDataEventType =
   | "execution_plan"
+  | "final_answer"
   | "token"
   | "progress"
   | "todo_update"
@@ -88,6 +89,7 @@ export type AgentSessionStreamDataEventType =
   | "tool_call"
   | "frontend_action"
   | "frontend_action_result"
+  | "answer_ui"
   | "ui_envelope"
   | "session_title"
   | "done"
@@ -584,6 +586,7 @@ function emitSessionSseEvent(
 
 function isSessionStreamDataEventType(value: string): value is AgentSessionStreamDataEventType {
   return (
+    value === "final_answer" ||
     value === "token" ||
     value === "progress" ||
     value === "todo_update" ||
@@ -595,6 +598,7 @@ function isSessionStreamDataEventType(value: string): value is AgentSessionStrea
     value === "tool_call" ||
     value === "frontend_action" ||
     value === "frontend_action_result" ||
+    value === "answer_ui" ||
     value === "ui_envelope" ||
     value === "session_title" ||
     value === "done" ||