Three pieces:
- src/lib/download.ts: generic downloadTextFile(filename, mime, text)
helper. Mirrors csv.ts:downloadCsv but takes an explicit MIME type and
drops the BOM prepend (which would corrupt the ISA segment).
- src/lib/api.ts: serializeClaim837(id) → {text, filename}. Fetches
GET /api/claims/{id}/serialize-837, pulls the suggested filename from
Content-Disposition (falls back to claim-{id}.x12 if the header is
missing). Throws ApiError on non-2xx so callers can branch on .status.
- ClaimDrawerHeader: Download icon button between the amount and the
close button. Click → api.serializeClaim837 → downloadTextFile.
Disabled + 'Downloading 837 file' aria-label while the fetch is in
flight so the click feels responsive. Optional onError prop surfaces
fetch failures; defaults to a no-op so existing callers stay clean.
Tests: 3 download.test.ts, 3 api.test.ts, 2 header.test.ts (happy
path + error path). Frontend: 350 passing (+8 from 342).
The live-tail stream (now reachable through the new Vite /api proxy)
started delivering activity rows with kind="manual_match", a kind the
ActivityFeed kindConfig map didn't know about. The map lookup returned
undefined, and reading .icon on it threw — taking the whole Activity
Log page down.
Two fixes:
1. Add "manual_match" to the ActivityKind union in src/types/index.ts
and to the kindConfig map in src/components/ActivityFeed.tsx (with
a Wrench icon + neutral tone), so the kind is properly typed and
rendered.
2. Add a FALLBACK_KIND guard so any future backend-emitted kind that
arrives before the frontend is updated no longer crashes the page.
kindConfig stays exhaustive for known kinds, so TypeScript still
catches missing entries at compile time.
Also adds src/components/ActivityFeed.test.tsx with three regression
tests (empty state, multi-item render, unknown-kind safety).
Brings the SP5 live-tail implementation into main:
Backend
* EventBus (cyclone.pubsub): per-kind fan-out with drop-oldest overflow
* FastAPI lifespan initializes the bus + db once per process
* store.add() publishes claim_written / remittance_written /
activity_recorded events on every batch write
* GET /api/{claims,remittances,activity}/stream: NDJSON snapshot +
live subscription + 15s idle heartbeat
* EventBus.unsubscribe() lets the tail loop release its queue on
client disconnect (no queue leak per open stream)
Frontend
* src/lib/tail-stream.ts: streamTail() async-generator over fetch
* src/store/tail-store.ts: zustand with FIFO cap 10k per slice
* src/hooks/useTailStream.ts: connecting/live/reconnecting/stalled/error/closed
state machine with 1→2→4→8→16→30s backoff
* src/hooks/useMergedTail.ts: base + tail merge with filter
* src/components/TailStatusPill.tsx: badge + Reconnect button
* Claims, Remittances, ActivityLog pages wired to the tail
Tests
* 437 backend tests pass (was 418 before SP5)
* 154 frontend tests pass (was 124)
* npm run typecheck clean
* end-to-end smoke: open /api/claims/stream, POST 837, see new claims
arrive in real time without refresh
# Conflicts:
# src/pages/ActivityLog.tsx
# src/pages/Remittances.test.tsx
# src/pages/Remittances.tsx
- RawSegmentsPanel: summary now reads 'Show N raw segments' for
non-empty (with singular pluralization). The previous identical
ternary branches read as a bug.
- PartiesGrid: replace the verbose intersection cast on AddressBlock
with a direct ClaimDetailAddress cast (the union's other arm is
Record<string, never>, ruled out by isEmptyAddress above).
ClaimDrawerError.tsx already wraps its error surface with role=alert
(line 36). Apply the same pattern to the ValidationPanel errors
sub-section so assistive tech announces blocking validation failures
when the drawer opens, matching the established sibling pattern.
Warnings stay decorative (no role change) — they're advisories, not
blocks.
The parametrized variant test only exercised 4 of the 6 mapped states
(submitted/denied/paid/pending). Add accepted (-> default) and matched
(-> success) so the entire STATE_VARIANT map is verified, not just the
branches whose tokens happened to be easy to reach.
Tyler