VS Code panel: a skill invocation with a long argument is rendered in full and covers the whole panel

Environment: Claude Code VS Code extension, Windows 11 Pro 10.0.26200, model claude-opus-5[1m].

When a skill is invoked with a long argument (e.g. `/przelot `), the user message is rendered in full in the chat panel. There is no way to collapse it. With a multi-KB argument the message fills the entire panel and the rest of the session is unreadable until the user scrolls past it every time.

Expected: long user messages (or at least skill/command invocations) rendered as a collapsed preview with an expand control, the same way tool calls and results are collapsed.

Start by locating the VS Code chat panel rendering for user messages and compare it with the existing collapsed tool-call and result UI. Reproduce the issue with a multi-KB skill argument; done means the invocation is collapsed by default, expandable, and no longer obscures the rest of the session.

Written by the indexing model from the issue text.