feat(release): v0.2.0 — batch 837 export, ClaimCard, theme tokens

Backend:

- New POST /api/batches/{id}/export-837: regenerate X12 837 files
  for a list of claim_ids into a ZIP using HCPF file naming standards,
  with a unique interchange/group control number per export. Wire
  the clearhouse Loop 1000A (NM1*41 + PER) and per-payer receiver
  (NM1*40) blocks so the serializer no longer falls back to
  CYCLONE / RECEIVER placeholders.
- /api/parse-837 and /api/parse-835 now surface the server-side
  batch_id in both JSON and NDJSON response shapes so the frontend
  can hit batch-scoped endpoints without an extra listBatches
  round-trip.
- Filename helpers and the 837 serializer updated to match the new
  HCPF envelope; tests cover batch export, parse batch_id, and the
  serializer's control-number uniqueness guarantee.

Frontend:
- New shared components: ClaimCard, ClaimCard837, DominantKpiCard,
  EditorialNote, ExportBar, TickerTape, and a charts/ set
  (BarChart, HBarChart, SegmentedBar, AgingBars).
- New useBatchExport hook driving ExportBar's download flow against
  the new endpoint.
- ClaimDrawer, Lane, and Layout migrated from raw CSS-variable
  colors to Tailwind theme tokens (bg-card, text-foreground,
  border/60, etc.) for consistency with the rest of the instrument
  chrome; the active tab indicator gains a subtle accent glow.
- Upload, Inbox, Batches, BatchDiff, Reconciliation, and Acks pages
  reworked to compose the new shared components and consume the new
  batch-scoped API surface (notably ExportBar wired into Batches).

Tooling / Docs:
- Add audit-uiux.mjs and a docs/goodclaim.x12 sample fixture.
- Update ClaimDrawer testids and add coverage for the new
  components and the useBatchExport hook.

Rolls up into the v0.2.0 release tag.

src/types/index.ts

@@ -299,6 +299,13 @@ export interface ParseResult837 {
   envelope: Envelope | null;
   claims: ClaimOutput[];
   summary: BatchSummary;
+  /**
+   * Server-side batch id (UUID). Present on the JSON response from
+   * POST /api/parse-837 — null/missing on the NDJSON-streaming path
+   * (use the final `summary.batch_id` from the NDJSON stream instead).
+   * Required by /api/batches/{batch_id}/export-837.
+   */
+  batch_id?: string | null;
 }
 
 // --- 835 ERA ---------------------------------------------------------------
@@ -379,6 +386,8 @@ export interface ParseResult835 {
   claims: ClaimPayment[];
   summary: BatchSummary;
   validation?: ValidationReport | null;
+  /** See ParseResult837.batch_id. */
+  batch_id?: string | null;
 }
 
 // --- NDJSON streaming ------------------------------------------------------