[codex] Fix sidebar preview settings reset

[juliusmarminge]

Summary

This follow-up addresses two useful review findings left on the already-merged sidebar thread preview setting PR (#1856).

The visible-thread setting was included in the restore-defaults confirmation copy, but it was not part of the payload sent to updateSettings. That meant a user could confirm a reset that explicitly listed "Visible threads" while the saved sidebar preview count stayed unchanged. The fix adds sidebarThreadPreviewCount to the restore-defaults patch alongside the other client settings.

The new setting was also present in ClientSettingsSchema but absent from ClientSettingsPatch. That left the patch contract inconsistent with the settings schema and would drop the field if the patch schema were used for decoding or validation. The fix adds the optional patch entry using the existing SidebarThreadPreviewCount schema.

I checked the Vite-related review thread too. Current main no longer has the startup-crash fallback change, and the remaining Vite comment is about an unrelated build-contract decision, so this PR stays scoped to the two still-actionable settings issues.

Validation

• bun fmt
• bun lint
• bun typecheck
• bun run test --filter=@t3tools/contracts --filter=@t3tools/web
• npx -y react-doctor@latest . --verbose --diff

Note

Fix sidebar preview settings reset to exclude sidebarThreadPreviewCount

The useSettingsRestore hook was not resetting sidebarThreadPreviewCount (Visible threads) when restoring defaults. This fix adds the field to the reset payload and extends the ClientSettingsPatch schema in settings.ts to accept it as an optional field.

^{Macroscope summarized 8897a78.}

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Note

Low Risk
Low risk bugfix limited to client settings reset behavior and the settings patch contract; no auth/security or complex logic changes.

Overview
Fixes a mismatch where restoring default settings did not actually reset sidebarThreadPreviewCount ("Visible threads") despite being listed in the confirmation prompt.

Also updates the contracts layer so ClientSettingsPatch accepts sidebarThreadPreviewCount, keeping the patch schema consistent with ClientSettingsSchema and preventing the field from being dropped during validation/decoding.

^{Reviewed by Cursor Bugbot for commit 8897a78. Bugbot is set up for automated code reviews on this repo. Configure here.}

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