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/ClaimCard/shared.tsx

@@ -0,0 +1,86 @@
+// Shared visual primitives used by ClaimCard837 and ClaimCard835.
+//
+// Both cards render validation status (Passed / Warnings / Failed) and
+// a grid of stat pills (Member, Place of service, …). The exact same
+// mark-up was being copy-pasted inside Upload.tsx for both cards; this
+// file is the shared home.
+
+import { AlertTriangle, CheckCircle2, XCircle } from "lucide-react";
+import { cn } from "@/lib/utils";
+
+/**
+ * Tri-state validation indicator.
+ *
+ * - `passed` → green "Passed" with check icon
+ * - `hasWarnings` → amber "Warnings" with triangle
+ * - else → red "Failed" with X
+ */
+export function ValidationDot({
+  passed,
+  hasWarnings,
+}: {
+  passed: boolean;
+  hasWarnings?: boolean;
+}) {
+  if (passed) {
+    return (
+      <span
+        className="inline-flex items-center gap-1.5 mono text-[10.5px] uppercase tracking-[0.12em] text-[hsl(var(--success))] font-medium"
+        title="Validation passed"
+      >
+        <CheckCircle2 className="h-3.5 w-3.5" strokeWidth={1.75} />
+        Passed
+      </span>
+    );
+  }
+  if (hasWarnings) {
+    return (
+      <span
+        className="inline-flex items-center gap-1.5 mono text-[10.5px] uppercase tracking-[0.12em] text-[hsl(var(--warning))] font-medium"
+        title="Validation passed with warnings"
+      >
+        <AlertTriangle className="h-3.5 w-3.5" strokeWidth={1.75} />
+        Warnings
+      </span>
+    );
+  }
+  return (
+    <span
+      className="inline-flex items-center gap-1.5 mono text-[10.5px] uppercase tracking-[0.12em] text-destructive font-medium"
+      title="Validation failed"
+    >
+      <XCircle className="h-3.5 w-3.5" strokeWidth={1.75} />
+      Failed
+    </span>
+  );
+}
+
+/**
+ * Small label + value cell for the expanded-card detail grid.
+ */
+export function StatPill({
+  label,
+  value,
+  mono = true,
+}: {
+  label: string;
+  value: React.ReactNode;
+  mono?: boolean;
+}) {
+  return (
+    <div className="flex flex-col gap-1">
+      <div className="mono text-[10px] uppercase tracking-[0.18em] font-semibold text-muted-foreground/70">
+        {label}
+      </div>
+      <div
+        className={cn(
+          "text-[13px]",
+          mono && "display mono"
+        )}
+        style={{ color: "hsl(var(--surface-ink))" }}
+      >
+        {value}
+      </div>
+    </div>
+  );
+}