Add "PostHog Web" button to Bluebird top bar

[raquelmsmith]

Problem

In the Bluebird / Channels (Website) space (gated behind project-bluebird), there's no quick way to jump from the desktop app back into the PostHog web app for the user's project.

Why: Raquel wanted a one-click link from the Channels top bar out to PostHog web, landing on the right cloud (US vs EU) for the signed-in account.

Changes

Adds a region-aware "PostHog Web" button with an external-link icon, pinned to the far right of the Channels title bar (where "Leave feedback" lives). Clicking it opens https://<us|eu>.posthog.com/project/<currentProjectId> in the browser — region derived from cloudRegion, falling back to the account root if no project is selected.

Reuses existing utilities (getPostHogUrl, openUrlInBrowser, useAuthStateValue); no new helpers. Single file touched: packages/ui/src/router/routes/__root.tsx.

How did you test this?

• biome lint on the changed file — clean.
• Verified all imported symbols/paths resolve to existing exports.
• Did not run the full app / typecheck (fresh clone without installed deps).

Automatic notifications

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

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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 f735284.}

[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/router/routes/__root.tsx:113-117
**Silent no-op when `cloudRegion` is unset**

`getPostHogUrl` returns `null` when `cloudRegion` is `null` (see `urls.ts` line 11). If that happens, `handleOpenPostHogWeb` skips `openUrlInBrowser` with no feedback to the user — the button click silently does nothing. In practice this shouldn't happen for a signed-in user in the Channels space, but the failure mode is invisible. Consider either disabling the button when `getPostHogUrl(…)` would produce `null`, or at minimum logging a warning so the state is observable during development.

_{Reviews (1): Last reviewed commit: "Add "PostHog Web" button to Bluebird top..." | Re-trigger Greptile}

[greptile-apps]

Silent no-op when cloudRegion is unset

getPostHogUrl returns null when cloudRegion is null (see urls.ts line 11). If that happens, handleOpenPostHogWeb skips openUrlInBrowser with no feedback to the user — the button click silently does nothing. In practice this shouldn't happen for a signed-in user in the Channels space, but the failure mode is invisible. Consider either disabling the button when getPostHogUrl(…) would produce null, or at minimum logging a warning so the state is observable during development.

Prompt To Fix With AI

This is a comment left during a code review.
Path: packages/ui/src/router/routes/__root.tsx
Line: 113-117

Comment:
**Silent no-op when `cloudRegion` is unset**

`getPostHogUrl` returns `null` when `cloudRegion` is `null` (see `urls.ts` line 11). If that happens, `handleOpenPostHogWeb` skips `openUrlInBrowser` with no feedback to the user — the button click silently does nothing. In practice this shouldn't happen for a signed-in user in the Channels space, but the failure mode is invisible. Consider either disabling the button when `getPostHogUrl(…)` would produce `null`, or at minimum logging a warning so the state is observable during development.

How can I resolve this? If you propose a fix, please make it concise.

[greptile-apps]

_{Reviews (2): Last reviewed commit: "Fix biome formatting and disable PostHog..." | Re-trigger Greptile}