Desktop app shows all skills in the / command menu - unlike terminal TUI #41643

In the desktop app (@opencode-aidesktop, v1.18.16), pressing / shows every registered skill as a command (e.g. /using-godot-prompter, each with a Skill badge). The terminal TUI already filters these out, so this is a desktop-only behavior.

Expected behavior

Skills should not appear in the / command menu - they are meant to be invoked by the agent via the native skill tool, not manually by the user. This matches the terminal TUI behavior.

How to reproduce

1. Install any plugin that registers skills (e.g. via skills.paths or a plugin's config hook)
2. Open the desktop app and press /
3. See all skills listed as commands with a Skill badge

Evidence / investigation

• The terminal TUI explicitly skips skill commands in the autocomplete menu: packages/tui/src/component/prompt/autocomplete.tsx - if (serverCommand.source === skill) continue;
• In the desktop app's bundle, the v1 legacy path contains a commented-out filter (// source: command.source === skill ? undefined : command.source), suggesting the intent existed but was not enabled.
• The permission.skill mechanism only offers allow/ask/deny; deny also hides skills from the agent, so there is no way to hide them from the menu while keeping them available to the agent.
• No config option (in opencode.json schema) controls skill visibility in the desktop command menu.

Suggested fix

Apply the same source === skill filter to the desktop app's command list loading (the api.list() path), mirroring the terminal TUI. Skills would remain discoverable/invocable by the agent via the skill tool; they would simply not clutter the user-facing / menu.