showThinkingSummaries: false is ignored — thinking blocks still render (desktop app, Code tab)

## What happens

`showThinkingSummaries` is set to `false` in `~/.claude/settings.json`, but extended thinking / reasoning blocks are still rendered inline in every assistant response.

## settings.json

```json
{
"theme": "auto",
"agentPushNotifEnabled": false,
"showThinkingSummaries": false
}
```

## Expected

No thinking summaries in the transcript.

## Actual

Every response shows the reasoning between tool calls. On a long task this is the bulk of what ends up on screen.

## Notes

- Desktop app, Code tab
- Windows 11 Pro (26200)
- Restarting the app does not help
- Has been happening for months, across versions
- No equivalent toggle exists in the app's settings panel, so there is no way to turn it off from the UI either

Start with ~/.claude/settings.json and the desktop app's Code tab, then trace where settings are loaded and where assistant responses render thinking blocks. Reproduce the issue with showThinkingSummaries set to false and verify that thinking summaries disappear; also determine whether the missing settings-panel toggle is part of the required change.

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