feat: add assistant chatbot with eligibility auto-check

- Add ChatbotButton component to top-app-bar (bot icon, upper right)
- Slide-in chat panel with 4 options: Check Eligibility, Schedule, Claims, Chat
- Single paste area accepts member ID + DOB in either order
- Age-based routing: ≥21 → MH Eligibility & History, <21 → CMSP auto-triggered
- Insurance-status page prefills fields and auto-fires the correct button via sessionStorage + custom event

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/Frontend/src/pages/insurance-status-page.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useState } from "react";
+import { useEffect, useRef, useState } from "react";
 import { useMutation, useQuery } from "@tanstack/react-query";
 import { Input } from "@/components/ui/input";
 import { Button } from "@/components/ui/button";
@@ -114,6 +114,27 @@ export default function InsuranceStatusPage() {
   const [cmspAccumulatorPdfId, setCmspAccumulatorPdfId] = useState<number | null>(null);
   const [cmspAccumulatorFilename, setCmspAccumulatorFilename] = useState<string | null>(null);
 
+  const pendingAutoCheck = useRef<"mh" | "cmsp" | null>(null);
+
+  // Prefill from chatbot
+  useEffect(() => {
+    const apply = () => {
+      const raw = sessionStorage.getItem("chatbot_eligibility");
+      if (!raw) return;
+      try {
+        const { memberId: id, dob, autoCheck: ac } = JSON.parse(raw);
+        if (id) setMemberId(id);
+        if (dob) setDateOfBirth(parseLocalDate(dob));
+        if (ac === "mh" || ac === "cmsp") pendingAutoCheck.current = ac;
+        sessionStorage.removeItem("chatbot_eligibility");
+      } catch {}
+    };
+    apply();
+    window.addEventListener("chatbot:eligibility-prefill", apply);
+    return () =>
+      window.removeEventListener("chatbot:eligibility-prefill", apply);
+  }, []);
+
   // Populate fields from selected patient
   useEffect(() => {
     if (selectedPatient) {
@@ -125,7 +146,7 @@ export default function InsuranceStatusPage() {
         typeof selectedPatient.dateOfBirth === "string"
           ? parseLocalDate(selectedPatient.dateOfBirth)
           : selectedPatient.dateOfBirth;
-      setDateOfBirth(dob);
+      setDateOfBirth(dob ?? null);
     } else {
       setMemberId("");
       setFirstName("");
@@ -574,6 +595,19 @@ export default function InsuranceStatusPage() {
     }
   };
 
+  // Auto-trigger from chatbot after prefill
+  useEffect(() => {
+    if (!pendingAutoCheck.current || !memberId || !dateOfBirth) return;
+    const check = pendingAutoCheck.current;
+    pendingAutoCheck.current = null;
+    if (check === "mh") {
+      handleMHEligibilityHistoryButton();
+    } else {
+      handleCMSPButton();
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [memberId, dateOfBirth]);
+
   // small helper: remove given query params from the current URL (silent, no reload)
   const clearUrlParams = (params: string[]) => {
     try {