Theme commands missing from command palette in new web layout

Description

In opencode web (v1.18.29, new default layout), the theme/color-scheme commands are gone from the command palette. Filtering for "theme" returns nothing.

Cause: the whole layout command group (theme, project, server, workspace, session-nav) is registered only in packages/app/src/pages/layout.tsx via command.register("layout", ...). The new layout packages/app/src/pages/layout-new.tsx is a thin wrapper and never registers it. With newLayoutDesigns on by default, the group is unavailable.

mod+shift+t (previously "cycle theme") now triggers tab.reopenClosed (titlebar.tsx:353), which stays registered in both layouts.

Expected: register the layout command group under the new layout too (e.g. extract into a shared hook used by both layouts), so theme commands are available again.

Plugins

No response

OpenCode version

1.18.29

Steps to reproduce

1. Run opencode web and open it in the browser (new layout, newLayoutDesigns default on).
2. Open the command palette (ctrl+p).
3. Type "theme".

Expected: theme / color-scheme commands. Actual: no results. Also ctrl+shift+t (formerly "cycle theme") now reopens a closed tab (which in itself is nice).

Screenshot and/or share link

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Operating System

Ubuntu 24.04

Terminal

No response