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>

frontend/components/analysis/earnings-chart.tsx

@@ -0,0 +1,34 @@
+"use client";
+
+import { Bar } from "@/components/charts/bar";
+import { BarChart } from "@/components/charts/bar-chart";
+import { BarXAxis } from "@/components/charts/bar-x-axis";
+import { Grid } from "@/components/charts/grid";
+import { ChartTooltip } from "@/components/charts/tooltip";
+import type { EarningsPoint } from "@/lib/analytics";
+
+// Earnings by month — billed vs paid — drawn with the project's Bklit chart
+// components (the vendored visx chart family under components/charts). Shared by
+// the Analysis page and the chat analytics card.
+export function EarningsChart({
+  data,
+  aspectRatio = "2 / 1",
+}: {
+  data: EarningsPoint[];
+  aspectRatio?: string;
+}) {
+  const chartData = data.map((d) => ({
+    name: d.label,
+    billed: d.billed,
+    paid: d.paid,
+  }));
+  return (
+    <BarChart aspectRatio={aspectRatio} data={chartData}>
+      <Grid horizontal />
+      <Bar dataKey="billed" fill="var(--chart-line-primary)" />
+      <Bar dataKey="paid" fill="var(--chart-2)" />
+      <BarXAxis />
+      <ChartTooltip showDatePill={false} />
+    </BarChart>
+  );
+}