feat(tui): print resume command on exit

tui/src/app.ts

@@ -94,6 +94,7 @@ interface AppOptions {
   version: string
   access: string
   theme: "auto" | ThemeMode
+  onExit?: (chatId: string) => void
 }
 
 interface ChatClient {
@@ -336,6 +337,11 @@ function singleLine(value: string, limit = 120): string {
   return value.replace(/\s+/gu, " ").trim().slice(0, limit)
 }
 
+export function sessionExitMessage(chatId: string): string {
+  const sessionId = `websocket:${chatId}`
+  return `Resume with: nanobot agent --session ${sessionId}\n`
+}
+
 async function copyWithSystemClipboard(text: string): Promise<void> {
   const commands = process.platform === "darwin"
     ? [["pbcopy"]]
@@ -2312,6 +2318,8 @@ export class NanobotTui {
     this.host.release()
     this.client.close()
     this.renderer.destroy()
+    const chatId = this.client.activeChatId || this.options.chatId
+    if (chatId) this.options.onExit?.(chatId)
   }
 
   private handleDestroy = (): void => {