Archive messages in Bluebird channels

[adboio]

Problem

In a Project Bluebird channel, every message kicks off a task that renders as a card in the Slack-style feed. Members could reply in a thread or open the task, but there was no way to archive a message/task from the channel — archiving only existed over in the /code space (side nav + context menu).

Why: so channel members can tidy their feed by archiving a message/task in place, without leaving the channel.

Changes

• ChannelFeedView — add an Archive action to each message's hover toolbar, alongside Reply and Open.
• WebsiteChannelHome — wire it to the existing useArchiveTask({ navigateSpace: "website" }), filter archived tasks out of the feed (same as the History tab already does), and emit the existing archive_task analytics on the channel_home surface.

A "message" in a channel is the task it kicked off, so this archives that task. It reuses the shared archive flow, so it's undoable via the toast (with Undo) that useArchiveTask already shows, stays filed to the channel, and reappears on undo. No new flag is needed — the whole Website space is already gated behind project-bluebird at the router.

How did you test this?

• turbo run typecheck --filter=@posthog/ui (builds deps + tsc --noEmit) — passes.
• biome check on both changed files — clean.
• Did not run the app / add a new automated test: these feed components are presentational and untested today, and the underlying archive + undo logic is already covered in @posthog/core.

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

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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 a8b6269.}