The `/terminal` command is unavailable on fresh installs of OpenCode 1.18.x

Description

The /terminal command (and the terminal button) is completely unavailable on fresh installs of OpenCode 1.18.x. It was present and working through 1.17.20, and I've traced it to the v1/v2 layout split introduced around v1.18.0 ("Desktop v2 migration").

Steps to reproduce

1. Install OpenCode fresh (no pre-existing ~/.config/opencode or prior project) on any 1.18.x version, e.g. 1.18.28.
2. Open opencode web / desktop.
3. Try /terminal in the prompt, or look for a terminal button in the UI.

Result: Neither the command nor the button exists. No terminal panel access at all.

Comparison / what still works

• A project/install that predates 1.18 and gets upgraded in place still has /terminal working, apparently because it keeps falling back to the legacy (v1) layout.
• A clean 1.18.x install never goes through that fallback, so /terminal is simply missing, with no setting to bring it back (confirmed via #38230 — no persistent toggle exists for new installs).

Expected behavior

Either:

• Reimplement /terminal (or a terminal button) in the new v2 layout, or
• If it was intentionally dropped, document the reasoning and the recommended replacement workflow.

Environment

• OpenCode version: 1.18.28 (also reproduced on other 1.18.x versions)
• Install type: fresh install, no pre-1.18 config/project
• Interface: opencode web
• OS: Linux

Related issues

• #38230 (layout toggle not persistent for new installs)
• #37012 (general request to keep legacy layout)
• #30945 (older/different report about the terminal button on 1.15/1.16, closed as not planned — predates the 1.18 v2 migration and is not the same root cause)

Plugins

No response

OpenCode version

1.18.28

Steps to reproduce

1. Install OpenCode fresh (no pre-existing ~/.config/opencode or prior project) on any 1.18.x version, e.g. 1.18.28.
2. Open opencode web / desktop.
3. Try /terminal in the prompt, or look for a terminal button in the UI.

Result: Neither the command nor the button exists. No terminal panel access at all.

Screenshot and/or share link

No response

Operating System

No response

Terminal

No response