VSCode extension: two-column chat layout — conversation left, tool output right

Feature request

In the VSCode extension, assistant prose and tool output (file diffs, command output, agent reports) are interleaved in one scrolling column. During long agentic sessions the conversation gets buried — the user reads a short assistant message, then hundreds of lines of tool output push it away, and they lose the thread of the actual discussion.

Request: an optional two-column layout for the chat panel:

• Left column: the human conversation only (user messages + assistant prose).
• Right column: tool activity — edits, command output, subagent progress/reports — scrolling independently.

The left column stays calm and readable; the right column can spew freely. A toggle (or setting) would be fine; the current single-column layout can remain the default.

Context: heavy multi-agent workflow (many background subagents reporting in), where the interleaving makes it genuinely hard to follow the discussion.

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