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/MatchedRemitCard.tsx

@@ -56,20 +56,20 @@ export function MatchedRemitCard({ matchedRemittance }: MatchedRemitCardProps) {
     >
       <h3
         data-testid="section-label"
-        className="eyebrow text-[color:var(--m-ink-tertiary)]"
+        className="eyebrow text-muted-foreground"
       >
         Matched Remittance
       </h3>
 
       <div
         data-testid="matched-remit-card-inner"
-        className="flex flex-col gap-4 rounded-lg border border-[color:var(--m-border-heavy)]/30 bg-[color:var(--m-surface)]/60 p-4 sm:flex-row sm:items-start sm:justify-between"
+        className="flex flex-col gap-4 rounded-lg border border-border/60 bg-muted/30 p-4 sm:flex-row sm:items-start sm:justify-between"
       >
         {/* Left: remit id + status badge + received date */}
         <div className="flex min-w-0 flex-col gap-2">
           <span
             data-testid="matched-remit-id"
-            className="mono text-sm text-[color:var(--m-ink-primary)]"
+            className="mono text-sm text-foreground"
           >
             {id}
           </span>
@@ -83,7 +83,7 @@ export function MatchedRemitCard({ matchedRemittance }: MatchedRemitCardProps) {
             </Badge>
             <span
               data-testid="matched-remit-received"
-              className="text-xs text-[color:var(--m-ink-tertiary)]"
+              className="text-xs text-muted-foreground"
             >
               Received {fmt.date(receivedAt)}
             </span>
@@ -94,7 +94,7 @@ export function MatchedRemitCard({ matchedRemittance }: MatchedRemitCardProps) {
         <div className="flex flex-col items-start gap-2 sm:items-end">
           <span
             data-testid="matched-remit-total-paid"
-            className="display text-3xl text-[color:var(--m-ink-primary)] tabular-nums"
+            className="display text-3xl text-foreground tabular-nums"
           >
             {fmt.usdPrecise(totalPaid)}
           </span>
@@ -103,7 +103,7 @@ export function MatchedRemitCard({ matchedRemittance }: MatchedRemitCardProps) {
             size="sm"
             onClick={handleViewRemittance}
             data-testid="view-remittance-link"
-            className="gap-1 text-[color:var(--m-ink-secondary)] hover:text-[color:var(--m-ink-primary)]"
+            className="gap-1 text-muted-foreground hover:text-foreground"
           >
             View remittance
             <ArrowRight