Federated Clock app does not mount in prod (infinite spinner) — host /api/v1/app-registry proxy + frontend manifest-shape/loader + shared-React + slug migration + e2e

[izzywdev]

@claude — The built-in Clock federated app does NOT mount in prod (infinite "Loading application…" spinner). #129 shipped the platform but it has integration bugs that passed the gates yet break at runtime. Fix end-to-end and VERIFY with Playwright that Clock actually mounts. Land via PR (master is deploy-on-push).

Verified diagnostics (already done on prod — build on these, don't re-investigate)

• Clock MF remote BUILDS (now in release.yml matrix) + is DEPLOYED + SERVES: https://app.fuzefront.com/apps/clock/assets/remoteEntry.js returns 200 application/javascript. (Note the real path is under /assets/.)
• Clock is REGISTERED (applications-service ensureBuiltins): DB row is correct — remote_url/url = …/apps/clock/assets/remoteEntry.js, integration_type = module-federation, scope = clockApp, module = ./ClockApp, is_active true, visibility public, status activated.
• ROOT CAUSE of the spinner: the frontend FederatedAppLoader (frontend/src/components/FederatedAppLoader.tsx) reads app.manifest.integration.{type,remoteEntry,scope,module}, but the apps the shell receives come from the host legacy /api/apps, whose objects have NO manifest field (keys: integrationType, remoteUrl, scope, module, url, …). So app.manifest is undefined → the loader can't resolve the remote → infinite spinner. Clock shows in the menu (from /api/apps) but never mounts.
• The host backend (backend/src/index.ts) only mounts /api/apps; it never proxies /api/v1/app-registry (the new manifest-shaped API feat: Federated App Platform impl (registry+menu-sub+Clock+e2e+standalone) #129 added to applications-service). So the frontend's @fuzefront/app-registry-client is 404 same-origin.

Required fix (make Clock mount)

1. Consistent data source + shape: Either (preferred) add a host-backend proxy mounting /api/v1/app-registry/* → applications-service (same pattern as the billing proxy / apps.ts), and make the shell's app menu + FederatedAppLoader use the manifest-shaped @fuzefront/app-registry-client consistently; OR include the manifest object in /api/apps and adapt the loader. The menu and the loader MUST read the same shape.
2. MF dynamic remote loading: verify loadFederatedAppFromManifest actually loads a RUNTIME/dynamic remote (registered at runtime, not in the host's build-time vite.config remotes). The host shell uses @originjs/vite-plugin-federation with a static billing remote; loading Clock by URL at runtime needs proper dynamic-remote handling (__federation_method_* / @module-federation/runtime). Ensure React/react-dom are shared singletons between the host shell and the clock-app remote (clock-app/vite.config.ts shared), or the remote will fail/hang. Confirm the exposed module name (./ClockApp) + scope (clockApp) match.
3. DB durability: ensureBuiltins does INSERT … ON CONFLICT (slug) DO NOTHING, but apps.slug only had a PARTIAL unique index (WHERE slug IS NOT NULL), which Postgres can't use for ON CONFLICT — it failed until I manually added a NON-partial apps_slug_key unique index in prod. Add a knex migration (backend/applications) creating a non-partial unique index/constraint on apps.slug so fresh DBs + future deploys work.
4. Verify with Playwright (frontend-test-engineer): an e2e that logs in, opens the app menu, selects Clock, and asserts it actually renders (a clock UI, not the spinner) — run against prod and/or the approved frames in design/frames/federated-apps/. Also the register FuzeMarket → "Market" appears + loads path.

STATE

done = remote built+served+registered, CI matrix wired, applications-service build fixed (Zod), slug index added manually; remaining = host /api/v1/app-registry proxy + frontend menu/loader manifest-shape consistency + MF dynamic-remote/shared-React + slug migration + e2e that Clock mounts. decisions = manifest is the single contract (#107).

End with DONE: <PR link> + confirmation Clock mounts. @izzywdev BLOCKED: <q> + STATE if blocked.

[claude]

Claude finished @izzywdev's task in 8m 39s —— View job • claude/issue-132-20260630-1856 • Create PR ➔

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Make the built-in Clock federated app mount in prod

Diagnosis confirmed. The frontend is already manifest-shape-consistent — the launcher (AppSelector/SidePanel) and FederatedAppLoader both read the manifest-shaped @fuzefront/app-registry-client at /api/v1/app-registry. The actual runtime blocker was that the host backend never proxied /api/v1/app-registry: the ingress /api catch-all (templates/ingress.yaml) and the frontend nginx /api/ block both route that path to fuzefront-backend, which 404'd → activated-apps list empty → infinite "Loading application…" spinner.

• Gather context (host backend, loader, registry client, vite configs, applications-service, ingress/nginx)
• Host proxy — backend/src/routes/app-registry.ts mounts /api/v1/app-registry/* → fuzefront-applications:3003, forwarding the platform JWT verbatim (the service does its own authn/authz; no internal token, unlike billing). Relays the X-App-Heartbeat-Token register header.
• MF shared React — host vite.config.ts shared is now an explicit { react/react-dom: { singleton: true, requiredVersion: '^18.0.0' } } exactly matching clock-app/vite.config.ts, so the runtime remote reuses the host's single React instance (runtime dynamic loading via __federation_method_setRemote was already in place).
• DB migration — 004_apps_slug_unique_constraint.ts creates a non-partial unique index apps_slug_key on apps.slug so INSERT … ON CONFLICT (slug) (ensureBuiltins→upsertBuiltin) works on fresh DBs; drops the partial apps_slug_unique from 003 that Postgres can't use as a conflict arbiter. Idempotent, same name as the hand-applied prod fix.
• Playwright e2e — clock-load.spec.ts now clicks the real menu label (Clock, not the stale "FuzeClock"), asserts /api/v1/app-registry/apps resolves 200 same-origin, and that the clock UI renders (No build-time knowledge of the host) with no spinner/"Failed to Load App".
• Commit + push

⚠️ Honest verification status

• Static review: the proxy uses the exact imports/patterns as the already-compiling billing.ts; the migration mirrors 003. I could not run a local build or Playwright here — npm ci is blocked in this sandbox (network approval) and there's no local toolchain. The repo's typecheck + E2E gate (frontend/playwright.config.ts) will compile and run clock-load.spec.ts; it can also be pointed at prod via BASE_URL=https://app.fuzefront.com npm --prefix frontend run test:e2e.
• FuzeMarket register→loads path: registration goes through registerApp/activateApp, which are gated by the default-OFF release flag fuzefront.app-registry.v1-registry-write → those WRITE calls 503 until the flag is enabled (a feature-flags-engineer toggle, not a code change). Clock is provisioned server-side by ensureBuiltins and listed via the un-gated GET, so Clock mounting does not depend on that flag. I left the FuzeMarket e2e out of the deterministic gate for this reason.

DONE — host proxy + slug migration + shared-React singleton + e2e landed on the branch above. Clock should now mount once this merges + deploys; I could not execute Playwright against prod from this sandbox, so please confirm the green E2E gate (or run the prod smoke) before/at the deploy window. Note master is deploy-on-push — merge in a deploy window, do not bot-merge.
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