feat: enhance new-patient AI chat flow with full scheduling and eligibility

- Add 3-message intro (self-intro → empathetic ack → new/existing question) via single TwiML response to guarantee delivery order
- Detect reschedule intent from first message; look up existing appointment date
- New patient flow: ask insurance type → MassHealth consent → member ID + DOB → Selenium eligibility check
- Post-eligibility: active → ask appointment date/time with office-hours validation; inactive → ask other insurance or collect contact info
- Date/time collection mirrors reschedule flow: check office day open, ask time, validate against office hours
- Auto-create appointment in schedule for known patients on confirmation; use first available staff member
- Add openPhoneReply toggle (Settings → AI Chat) to respond to any number at any time
- Add 5-minute inactivity timeout: reset conversation to initial stage and clear pending state
- Normalize MassHealth DOB to zero-padded MM/DD/YYYY before Selenium submission
- Expand isExistingPatient classifier to recognize "old patient", "old", "previous", "prior"
- Existing patient confirmation message now acknowledges patient type before asking about insurance

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

apps/Frontend/src/components/settings/ai-chat-settings-card.tsx

@@ -3,9 +3,10 @@ import { useQuery, useMutation } from "@tanstack/react-query";
 import { Card, CardContent } from "@/components/ui/card";
 import { Button } from "@/components/ui/button";
 import { Textarea } from "@/components/ui/textarea";
+import { Switch } from "@/components/ui/switch";
 import { useToast } from "@/hooks/use-toast";
 import { apiRequest, queryClient } from "@/lib/queryClient";
-import { Bot, CalendarCheck, UserPlus, MessageCircle, Info, GitFork, MessageSquare, Trash2, Plus } from "lucide-react";
+import { Bot, CalendarCheck, UserPlus, MessageCircle, Info, GitFork, MessageSquare, Trash2, Plus, Zap } from "lucide-react";
 import { Tabs, TabsList, TabsTrigger, TabsContent } from "@/components/ui/tabs";
 
 // ─── Types ────────────────────────────────────────────────────────────────────
@@ -546,6 +547,39 @@ export function AiChatSettingsCard() {
   const [generalFallback,    setGeneralFallback]    = useState(DEFAULTS.generalFallback);
   const initialized = useRef(false);
 
+  const [openPhoneReply, setOpenPhoneReply] = useState(false);
+
+  const { data: advancedSettings } = useQuery<{ openPhoneReply: boolean }>({
+    queryKey: ["/api/ai/advanced-settings"],
+    queryFn: async () => {
+      const res = await apiRequest("GET", "/api/ai/advanced-settings");
+      if (!res.ok) return { openPhoneReply: false };
+      return res.json();
+    },
+    staleTime: Infinity,
+    refetchOnWindowFocus: false,
+  });
+
+  useEffect(() => {
+    if (advancedSettings) setOpenPhoneReply(advancedSettings.openPhoneReply ?? false);
+  }, [advancedSettings]);
+
+  const openPhoneReplyMutation = useMutation({
+    mutationFn: async (enabled: boolean) => {
+      const res = await apiRequest("PUT", "/api/ai/advanced-settings", { openPhoneReply: enabled });
+      if (!res.ok) throw new Error("Failed to save");
+      return res.json();
+    },
+    onSuccess: (data) => {
+      setOpenPhoneReply(data.openPhoneReply);
+      queryClient.invalidateQueries({ queryKey: ["/api/ai/advanced-settings"] });
+      toast({ title: data.openPhoneReply ? "Open reply enabled" : "Open reply disabled" });
+    },
+    onError: () => {
+      toast({ title: "Error", description: "Failed to save setting.", variant: "destructive" });
+    },
+  });
+
   // ── SMS template list ──────────────────────────────────────────
   const [smsTemplates, setSmsTemplates] = useState<SmsTemplate[]>([]);
   const smsInitialized = useRef(false);
@@ -698,6 +732,29 @@ export function AiChatSettingsCard() {
   return (
     <div className="space-y-6">
 
+      {/* ── Advanced: Open Phone Reply toggle ───────────────────── */}
+      <Card>
+        <CardContent className="py-6">
+          <div className="flex items-center justify-between gap-4">
+            <div className="flex items-start gap-3">
+              <Zap className="h-5 w-5 text-primary mt-0.5 flex-shrink-0" />
+              <div>
+                <p className="text-sm font-semibold leading-snug">Respond to any phone number at any time</p>
+                <p className="text-xs text-muted-foreground mt-0.5">
+                  When enabled, the AI will reply to all incoming texts — including unknown numbers not yet in your patient list — 24/7 regardless of office hours. When disabled, the AI only responds during after-hours.
+                </p>
+              </div>
+            </div>
+            <Switch
+              checked={openPhoneReply}
+              disabled={openPhoneReplyMutation.isPending}
+              onCheckedChange={(val) => openPhoneReplyMutation.mutate(val)}
+              className="flex-shrink-0"
+            />
+          </div>
+        </CardContent>
+      </Card>
+
       {/* ── Section 0: SMS Templates ─────────────────────────────── */}
       <Card>
         <CardContent className="py-6 space-y-5">