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/components/ClaimDrawer/DiagnosesList.tsx

@@ -35,7 +35,7 @@ export function DiagnosesList({ diagnoses }: DiagnosesListProps) {
     <section className="flex flex-col gap-3 px-6 py-4">
       <h3
         data-testid="section-label"
-        className="eyebrow text-[color:var(--m-ink-tertiary)]"
+        className="eyebrow text-muted-foreground"
       >
         Diagnoses ({diagnoses.length})
       </h3>
@@ -43,7 +43,7 @@ export function DiagnosesList({ diagnoses }: DiagnosesListProps) {
       {diagnoses.length === 0 ? (
         <p
           data-testid="diagnoses-empty"
-          className="text-sm text-[color:var(--m-ink-tertiary)]"
+          className="text-sm text-muted-foreground"
         >
           No diagnoses
         </p>
@@ -58,17 +58,17 @@ export function DiagnosesList({ diagnoses }: DiagnosesListProps) {
                 className="flex items-baseline gap-3 text-sm"
               >
                 <span
-                  className="mono text-[color:var(--m-ink-primary)] font-medium"
+                  className="mono text-foreground font-medium"
                 >
                   {d.qualifier ? `${d.qualifier} ${d.code}` : d.code}
                 </span>
                 {desc ? (
                   <>
                     <span
-                      className="h-px w-3 bg-[color:var(--m-border-heavy)]/30"
+                      className="h-px w-3 bg-border/60"
                       aria-hidden
                     />
-                    <span className="text-[color:var(--m-ink-secondary)] italic">
+                    <span className="text-muted-foreground italic">
                       {desc}
                     </span>
                   </>