fix(channels): sidebar overflow, archive, tooltips, private-task filtering, and bluebird cmd-k routing

[raquelmsmith]

Summary

A batch of small UX fixes for the channels sidebar, plus a CMD-K routing change for the project-bluebird flag.

Channels sidebar

• No more horizontal scroll — long task names truncate with an ellipsis instead of expanding the row.
• Archive from the context menu — added an "Archive" option to the task right-click menu (uses the existing archive flow with undo toast).
• Hide archived tasks — archived tasks no longer appear in channel listings.
• Hide tasks not shared with me — tasks are private per user, so a task filed by someone else used to render as "Untitled task". These are now hidden entirely.
• Full name on hover — task names show their full title in a tooltip after a ~600ms delay.
• Hover + on the "Channels" header — opens the new-channel modal; the affordance only appears when hovering the header row itself, not the section below it.
• Icon spacing — the channel-name leading icon now matches the spacing of other rows in the list.

CMD-K

• When project-bluebird is enabled, selecting a task that is filed to a channel routes to the channel-organized view under /website/$channelId/tasks/$taskId instead of /code/tasks/$taskId. Non-bluebird users are unaffected.

Testing

• Typecheck + Biome pass (also enforced by the pre-commit hook).
• Tooltip wiring verified live against the running app over CDP: hovering a task row opens a delayed tooltip showing the full task title.

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Created with PostHog Code

[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit f88dd97.}

[greptile-apps]

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

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### Issue 1 of 1
packages/ui/src/features/canvas/components/ChannelsList.tsx:270-278
**Archive doesn't navigate away when viewing the task in channel view**

`archiveTask` calls `navigateAwayFromTaskIfActive`, which checks `getAppViewSnapshot().type === "task-detail"`. But `deriveFromMatches` in `useAppView.ts` only maps `/code/tasks/$taskId` to `"task-detail"` — the `/website/$channelId/tasks/$taskId` route falls through to the `default` branch and returns `"task-input"`. So when a user is viewing a channel task at `/website/…/tasks/$taskId` and archives it from this context menu, the stale task detail stays visible in the main pane; no navigation fires. Adding `case "/website/$channelId/tasks/$taskId"` (returning `{ type: "task-detail", taskId }`) to `deriveFromMatches` would fix this.

_{Reviews (1): Last reviewed commit: "fix(channels): sidebar overflow, archive..." | Re-trigger Greptile}