feat: clinic-wide AI (analytics/earnings/inventory + invoice-from-file),

real Live card, persistent chat history

Analytics & earnings:
- Analytics now carries real money computed from invoices (billed/paid/
  outstanding + by-month); new Earnings section on the Analysis page drawn with
  the project's Bklit chart components (shared EarningsChart).

AI agent reaches the whole clinic:
- new read tools getClinicInfo / getAnalytics / listInventory render clinic,
  analytics (with a Bklit earnings chart) and inventory cards in chat
- proposeInvoice turns an uploaded purchase/medication list into an invoice
  (new "invoice" action-preview kind → createInvoice); invoices/appointments
  auto-create/link a patient (ensurePatient) so they hit the Patients page

Live card:
- plots real data — patients checked in today — via GET /api/analytics/live
  (polled); value pill clamped and margins widened so nothing spills the card

Persistent AI chat history (Claude-style):
- ai_chat_threads + ai_chat_messages (migration 0016); per-user, org-scoped
  thread CRUD under /api/chat/threads
- chat panel owns a thread id, loads /?thread=<id>, and auto-saves after each
  exchange; sidebar lists past chats (open/delete), "New chat" starts fresh

Verified with backend typecheck + frontend tsc + next build.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/src/services/invoices.ts

@@ -4,6 +4,7 @@ import { db } from "../db/index.js";
 import { invoices } from "../db/schema/invoices.js";
 import type { InvoiceInput } from "../lib/invoice-validation.js";
 import type { Invoice, InvoiceInstallment } from "../types/invoice.js";
+import * as patients from "./patients.js";
 
 type InvoiceRow = typeof invoices.$inferSelect;
 
@@ -104,9 +105,17 @@ export async function createInvoice(
   input: InvoiceInput,
 ): Promise<Invoice> {
   const number = input.number || (await generateInvoiceNumber(orgId));
+  // Link to a patient — creating one when the invoice has no file number (e.g.
+  // an AI invoice built from an uploaded purchase list), so the client shows up
+  // on the Patients page.
+  const fileNumber = await patients.ensurePatient(orgId, userId, {
+    fileNumber: input.fileNumber,
+    name: input.name,
+    initials: input.initials,
+  });
   const [row] = await db
     .insert(invoices)
-    .values(columns(orgId, { ...input, number }, userId))
+    .values(columns(orgId, { ...input, number, fileNumber }, userId))
     .returning();
   return toInvoice(row!);
 }