fix(github): link org installs to the app page instead of a 404

[charlesvien]

Problem

The "Manage on GitHub" gear in Settings → GitHub (and the Settings button in the onboarding GitHub panel) links to GitHub's per-installation settings page for an org install: https://github.com/organizations/<org>/settings/installations/<id>.

That page is org-owner-only, so it 404s for any org member who isn't an owner. Cory hit this on the PostHog org's shared posthog app installation.

I confirmed against the live GitHub API that this is not a stale/wrong ID or a bad URL format:

• Installation 99844466 is an Organization install of the posthog GitHub App.
• Its canonical html_url is exactly the URL the app builds (and the one that 404s).
• Org GitHub App settings pages require org-owner access, so members get a 404. There is no per-installation GitHub URL a non-owner can open.

Changes

• For Organization installs, both URL builders now return the GitHub App page https://github.com/apps/posthog, which loads for everyone (owners land on Configure, members get request/install).
  • githubInstallationSettingsUrl in packages/core/src/settings/githubRepoSummary.ts (the reported Settings gear).
  • buildInstallationSettingsUrl in packages/core/src/onboarding/githubConnectPanel.ts (the onboarding panel, same latent bug).
• Personal (User) installs keep their existing https://github.com/settings/installations/<id> link, which that user can access.

No visual UI change: this only changes where the existing gear/button navigates.

How did you test this?

• Updated and ran the unit tests for both helpers.
• pnpm --filter @posthog/core test: 1851 passed.
• pnpm --filter @posthog/core typecheck and pnpm --filter @posthog/ui typecheck: clean. Pre-commit pnpm typecheck (full workspace) also passed.
• biome lint on the changed files: clean.
• Verified the destination https://github.com/apps/posthog loads as a valid public app page.

Automatic notifications

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

[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit 86a4641.}

[greptile-apps]

_{Reviews (1): Last reviewed commit: "link org GitHub installs to the app page" | Re-trigger Greptile}

[github-actions]

Clean URL fix: org installs now link to the public app page instead of a settings page that 404s for non-owners. The bot's two concerns (duplicate constant, case-sensitivity inconsistency) were both addressed in the current diff — shared constant extracted to a new integrations file, and both functions now use toLowerCase(). Tests cover the new behavior including case-insensitive matching.