[BUG] Project folder-picker and archive toggle unresponsive after working folder moved

### Preflight Checklist

- [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) and this hasn't been reported yet
- [x] This is a single bug report (please file separate reports for different bugs)
- [x] I am using the latest version of Claude Code

### What's Wrong?

After moving my Claude Workspace folder (from ~/Desktop/Claude Workspace to ~/Claude Workspace), a project ("Business") lost its folder connection and now shows: "Working folder no longer exists. Choose a different folder to continue."

### What Should Happen?

Selecting a valid folder should reconnect the project; archiving should be reversible.

### Error Messages/Logs

```shell

```

### Steps to Reproduce

Move/rename the local folder a Claude Code project is connected to
Reopen the project — banner appears: "Working folder no longer exists"
Click "Choose folder" → native picker opens → select the correct (new) folder → click Open
Bug: Nothing happens. Banner persists, folder is not reconnected.
Click "Archive" on the banner → chat archives successfully
Try to unarchive → Bug: UI shows "session has been unarchived" but the input remains disabled and the archive banner never actually clears

### Claude Model

Sonnet (default)

### Is this a regression?

Yes, this worked in a previous version

### Last Working Version

_No response_

### Claude Code Version

2.1.78 (Claude Code)

### Platform

Anthropic API

### Operating System

macOS

### Terminal/Shell

Terminal.app (macOS)

### Additional Information

Confirmed this isn't a local data issue — ~/.claude.json and ~/.claude/projects/ already correctly reference the new folder path locally; the bug persists in the UI regardless.

The report names no source files, tests, or entry points. Start by reproducing the issue on macOS after moving a project folder, then trace the folder-selection and archive/unarchive flows. Done means selecting the new folder reconnects the project, and unarchiving clears the banner and re-enables input.

索引モデルが issue の本文から書いたものです。