[adenarc]

For #394 and #399. Draft until the everything-dev release that includes NEARBuilders/everything-dev#662 (merged, not yet in a release; latest is rc.27). After that, City Node needs the platform pin bump to rc.28.

What this does

• Show the community's channels on the joined screen #394, community channels on the joined screen.
  • everything-dev#662 adds an onboard.community.url auth variable. After a code is redeemed, the joined screen fetches that app path with the redeemed organization ID and shows Visit {community} plus the community's channels.
  • New public GET /communities/by-organization/{organizationId} (getOnboardCommunity) returns { name, href, channels }:
    • it resolves the organization to its active tenant, then to the community's node, using the same first-by-name-then-id pick as the dashboard;
    • child nodes keep their parentId in the link;
    • channels come from the published discovery profile only, and a failed discovery read returns no channels rather than hiding the link;
    • an unknown or suspended community returns 404, which the joined screen treats as "no community" without holding up the page.
  • bos.app.ts sets onboard.community.url to /api/communities/by-organization/{organizationId}.
  • The default next/home/explore links (/build, /dashboard, /explore) already fit City Node, so they're left as is.
• Don't tell people who left that they've rejoined #399, rescan after leaving. This lands entirely upstream in #662: the "You're no longer a member" state, the MembershipEnded error and clearing the stale active organization. City Node needs no code for it, only the pin bump.

Tested

• pnpm typecheck, pnpm lint, api tests (435) and ui tests (1126) pass.
• New integration tests cover published channels (signed out), no or unpublished channels, a child node's parentId, and unknown or suspended communities.
• Local stack with seeded data:
  • /api/communities/by-organization/<org> returns the name, /n/<slug> and both channels;
  • a community without a profile returns empty channels;
  • an unknown org returns 404;
  • the linked community page renders with its channels.

Before marking ready

• everything-dev rc with #662 released, then pnpm bos upgrade
• Redeem a code locally: check Visit {community} and the channels, and the rescan-after-leaving message, at 375px. Then add "Closes Show the community's channels on the joined screen #394" and "Closes Don't tell people who left that they've rejoined #399"

Screenshots

No visible change in City Node yet. This PR adds an API route and auth config; the joined screen that uses them is the upstream auth plugin's page, which only gains "Visit {community}" and channels after the rc with everything-dev#662 is pinned. Joined-screen screenshots (with channels, without channels, and 375px) will be added with the pin bump, before this leaves draft.