feat(frontend): wire Vite app to FastAPI parser with NDJSON streaming + Upload page

src/store/index.ts

@@ -0,0 +1,67 @@
+import { create } from "zustand";
+import {
+  sampleActivity,
+  sampleClaims,
+  sampleProviders,
+  sampleRemittances,
+} from "@/data/sampleData";
+import type {
+  Activity,
+  Claim,
+  ParsedBatch,
+  Provider,
+  Remittance,
+} from "@/types";
+
+interface AppState {
+  // Legacy in-memory store used by the existing pages.
+  claims: Claim[];
+  providers: Provider[];
+  remittances: Remittance[];
+  activity: Activity[];
+
+  addClaim: (claim: Claim) => void;
+  addActivity: (entry: Activity) => void;
+
+  // Parsed-batch slice — populated by the Upload page when the user uploads
+  // a real EDI file through the FastAPI backend. Independent of the legacy
+  // store above so the existing pages keep working with sample data.
+  parsedBatches: ParsedBatch[];
+  activeBatchId: string | null;
+  addParsedBatch: (batch: ParsedBatch) => void;
+  setActiveBatchId: (id: string | null) => void;
+}
+
+export const useAppStore = create<AppState>((set) => ({
+  claims: sampleClaims,
+  providers: sampleProviders,
+  remittances: sampleRemittances,
+  activity: sampleActivity,
+
+  addClaim: (claim) =>
+    set((s) => ({
+      claims: [claim, ...s.claims],
+      activity: [
+        {
+          id: `ACT-${claim.id}`,
+          kind: "claim_submitted",
+          message: `Submitted ${claim.id} · ${claim.patientName}`,
+          timestamp: claim.submissionDate,
+          npi: claim.providerNpi,
+          amount: claim.billedAmount,
+        },
+        ...s.activity,
+      ],
+    })),
+
+  addActivity: (entry) => set((s) => ({ activity: [entry, ...s.activity] })),
+
+  parsedBatches: [],
+  activeBatchId: null,
+  addParsedBatch: (batch) =>
+    set((s) => ({
+      parsedBatches: [batch, ...s.parsedBatches],
+      activeBatchId: batch.id,
+    })),
+  setActiveBatchId: (id) => set({ activeBatchId: id }),
+}));