fix(canvas): show only team messages in thread sidebar on full task view

[adboio]

Problem

On the full task view (/website/$channelId/tasks/$taskId), the right-hand thread sidebar is rendered next to TaskDetail, which already hosts the agent session. The sidebar's timeline interleaved agent turns and user→agent prompts with the team conversation, so expanding a task from the channel-home thread left the same agent comms duplicated across both panes — the sidebar should show only the human-to-human conversation.

Changes

• Added a showAgentComms prop (default true) to ThreadPanel / ThreadSidebar. When false, it drops agent turns and user→agent prompts from the timeline and hides the agent status line.
• The channel task detail route passes showAgentComms={false}, so its sidebar shows only team messages.
• The channel-home thread sidebar is unchanged (still shows the full timeline).

How did you test this?

• pnpm --filter @posthog/ui typecheck — no new errors in the touched files (remaining errors are pre-existing missing-host-module resolution unrelated to this change).
• vitest run for threadPanelStore.test.ts and WebsiteLayout.test.tsx — pass.
• biome check on the three changed files — clean.

Why

You end up with the full-screen task open and the same agent conversation duplicated in the thread sidebar; the sidebar should carry the team discussion only, since the agent session already lives in the main task pane.

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Created with PostHog Code

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[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit c88c609.}