[BUG] TUI status line doesn't update permission mode after /config change (fullscreen, macOS)

### 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?

The TUI status line continues displaying "manual mode on" after switching to auto mode via `/config`. The setting changes successfully in settings.json (confirmed by the command output), but the display never updates—even after multiple turns or starting a new session.

### What Should Happen?

Status line should update to "auto mode on" either:
- Immediately after /config command succeeds, OR
- After starting a new session with defaultMode: auto in settings.json

### Error Messages/Logs

```shell

```

### Steps to Reproduce

Steps to reproduce:
1. Verify `~/.claude/settings.json` has `"defaultMode": "auto"` at line 19
2. Start Claude Code CLI (fullscreen TUI mode)
3. Observe status line shows "manual mode on"
4. Run `/config` → change permission mode to auto
5. Command outputs: "Set permissionMode to auto"
6. Submit 4+ prompts (allow time for UI refresh)
7. Exit and start new session

Expected: Status line shows "auto mode on"
Actual: Status line still shows "manual mode on"

### Claude Model

None

### Is this a regression?

Yes, this worked in a previous version

### Last Working Version

_No response_

### Claude Code Version

2.1.273

### Platform

AWS Bedrock

### Operating System

macOS

### Terminal/Shell

Terminal.app (macOS)

### Additional Information

Environment

- OS: macOS Darwin 25.6.0
- Claude Code version: 2.1.273
- Installation method: Direct download
- Terminal: MacOS Terminal
- TUI mode: fullscreen
- Shell: bash

Additional context

- The permission mode setting itself changes correctly (verified via config command)
- Only the TUI display indicator fails to update
- Workaround: Check settings.json directly to verify actual mode
- The "manual mode on" text is appended by Claude Code's TUI

Start at the /config command and the fullscreen TUI status-line display, comparing the permission mode saved in ~/.claude/settings.json with the mode shown after a new session. Reproduce on macOS Terminal.app with version 2.1.273; done means the indicator changes from manual mode on to auto mode on after the setting changes.

Written by the indexing model from the issue text.