[Bug]: Auto-settle inactivity setting appears as a top-level option

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/web

Steps to reproduce

1. Open Settings.
2. Open the General settings panel.
3. Enable Auto-settle inactive threads.
4. Compare Days of inactivity before auto-settle with its parent toggle and with the existing Start from origin child setting.

Expected behavior

Days of inactivity before auto-settle should be visually presented as a child of Auto-settle inactive threads.

Actual behavior

The inactivity-days row uses the default settings-row styling, so it appears to be an unrelated top-level setting.

Impact

Cosmetic issue

Version or commit

main before #7093

Environment

Web and desktop clients using the shared web settings UI.

Logs or stack traces

Not applicable.

Screenshots, recordings, or supporting files

Not applicable.

Workaround

The dependency is still functional, but users must infer the relationship from the control appearing only after the parent toggle is enabled.

Implemented in #7093.

Start in apps/web by tracing the General settings panel and the existing "Start from origin" child setting, using the shared web settings UI described in the issue. Compare the styling of "Days of inactivity before auto-settle" with its parent toggle and that child setting. Done means the row is visually presented as a child of "Auto-settle inactive threads" while preserving the existing behavior.