fix(cli): remember "Start new chat session" until summary changes

[reidliu41]

TLDR

Fixes the Welcome Back flow so choosing Start new chat session is remembered for the current project until .qwen/ PROJECT_SUMMARY.md changes.

This avoids repeatedly showing the same dialog on every restart after the user has already chosen to start fresh.

Screenshots / Video Demo

=================================

  > /summary

  ✅ Project summary generated and saved successfully! Saved to: .qwen/PROJECT_SUMMARY.md


/tmp/qwen-3088-repro$ cat .qwen/PROJECT_SUMMARY.md
The user wants a project summary in markdown format based on the conversation history.

    *   User provided context: Date, OS, working directory (`/tmp/qwen-3088-repro`), folder structure (contains `READM

select -- start a new session
Tips: Try /insight to generate personalized insights from your chat history.
   ╭──────────────────────────────────────────────────────────────────────────────────────────────────╮
   │                                                                                                  │
   │ 👋 Welcome back! (Last updated: just now)                                                        │
   │                                                                                                  │
   │ 🎯 Overall Goal:                                                                                 │
   │                                                                                                  │
   │   The user is currently orienting themselves and the agent within a new project environment      │
   │   located at `/tmp/qwen-3088-repro`.                                                             │
   │                                                                                                  │
   │ 📋 Current Plan:                                                                                 │
   │                                                                                                  │
   │   Progress: 0/2 tasks completed                                                                  │
   │                                                                                                  │
   │   Pending Tasks:                                                                                 │
   │   • [TODO] Analyze `README.md` to understand the project's objectives and technical stack.       │
   │   • [TODO] Await further instructions from the user on specific tasks to perform.                │
   │                                                                                                  │
   │                                                                                                  │
   │ What would you like to do?                                                                       │
   │ Choose how to proceed with your session:                                                         │
   │                                                                                                  │
   │ › 1. Start new chat session                                                                      │
   │   2. Continue previous conversation                                                              │
   │                                                                                                  │
   ╰──────────────────────────────────────────────────────────────────────────────────────────────────╯



$ cat .qwen/welcome-back-state.json
{
  "version": 1,
  "lastChoice": "restart",
  "summaryFingerprint": "1776297794736.0078:1850"
}


=================================

quit -> access again:

/tmp/qwen-3088-repro$ qwen

   ▄▄▄▄▄▄  ▄▄     ▄▄ ▄▄▄▄▄▄▄ ▄▄▄    ▄▄   ┌──────────────────────────────────────────────────────────┐
  ██╔═══██╗██║    ██║██╔════╝████╗  ██║  │ >_ Qwen Code (v0.14.4)                                   │
  ██║   ██║██║ █╗ ██║█████╗  ██╔██╗ ██║  │                                                          │
  ██║▄▄ ██║██║███╗██║██╔══╝  ██║╚██╗██║  │ API Key | gemma4:31b (/model to change)                  │
  ╚██████╔╝╚███╔███╔╝███████╗██║ ╚████║  │ /tmp/qwen-3088-repro                                     │
   ╚══▀▀═╝  ╚══╝╚══╝ ╚══════╝╚═╝  ╚═══╝  └──────────────────────────────────────────────────────────┘

  Tips: Try /insight to generate personalized insights from your chat history.

───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
>   Type your message or @path/to/file
───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

=================================


summary again and changed, ask again:

  > /summary

  ✅ Project summary generated and saved successfully! Saved to: .qwen/PROJECT_SUMMARY.md


quit --> access again
   │ What would you like to do?                                                                       │
   │ Choose how to proceed with your session:                                                         │
   │                                                                                                  │
   │ › 1. Start new chat session                                                                      │
   │   2. Continue previous conversation

$ cat .qwen/welcome-back-state.json
{
  "version": 1,
  "lastChoice": "restart",
  "summaryFingerprint": "1776298405153.2666:1435"
}

Dive Deeper

Root cause:

• Welcome Back only checked whether .qwen/PROJECT_SUMMARY.md existed.
• Choosing Start new chat session only updated in-memory UI state for the current process.
• After restarting Qwen Code, that choice was lost, so the dialog appeared again.

Reviewer Test Plan

Testing Matrix

	🍏	🪟	🐧
npm run	❓	❓	✅
npx	❓	❓	✅
Docker	❓	❓	❓
Podman	❓	-	-
Seatbelt	❓	-	-

Linked issues / bugs

Fixes #3088

[tanzhenxin]

Review

Clean fix for a real UX annoyance — persists the "Start new chat session" choice so the dialog doesn't re-appear on every restart. Implementation is well-scoped and the state file schema is properly versioned.

One minor note: the mtime:size fingerprint can trigger false re-shows after operations like git stash pop that touch mtime without changing content. Not blocking — a content hash could be a follow-up improvement.

Looks good! Please rebase to resolve the merge conflict and this is ready to go.

Verdict

APPROVE

[reidliu41]

thanks, updated

[tanzhenxin]

LGTM, thanks for the update!