feat: AI chatbot preauth intent, UnitedDH pre-auth improvements

- Add preauth intent to AI chatbot (classifier, workflow, frontend UI card)
- Auto-prefill preauth form with CDT codes, service date, and mapped prices
- Auto-trigger preauth Selenium handler by insurance siteKey (MH/Tufts/CCA/UnitedDH)
- Default tentative service date to today+3 for preauth (user didn't pick a date)
- Fix #number always means tooth number, distributes to all procedures in comma list
- Fix bare "post"/"pos" → D2954 (was matching D2955 via keyword scorer)
- UnitedDH pre-auth: fill procedure date with Ctrl+A to overwrite prefilled value
- UnitedDH pre-auth: select Location "Summit Dental Care" in step1 (same as billing entity)
- UnitedDH pre-auth: remove page refresh in step9 to preserve pre-auth number
- UnitedDH pre-auth: wait for table rows before extracting pre-auth number
- UnitedDH pre-auth/claim: explicit wait for Submit button after file upload (no sleep)

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

apps/Frontend/src/components/layout/chatbot.tsx

@@ -30,7 +30,8 @@ type Step =
   | "need-insurance-clarification"
   | "need-appointment-selection"
   | "need-cdt-clarification"
-  | "claim-ready";
+  | "claim-ready"
+  | "preauth-ready";
 
 interface Message {
   id: number;
@@ -158,6 +159,13 @@ export function ChatbotButton() {
     appointmentId: number | null;
     renderingProvider: string | null;
   } | null>(null);
+  const [preauthReadyData, setPreauthReadyData] = useState<{
+    patient: PatientResult | null;
+    matchedCodes: { code: string; description: string; toothNumber?: string }[];
+    siteKey: string;
+    serviceDate: string;
+    renderingProvider: string | null;
+  } | null>(null);
   const [pendingFiles, setPendingFiles] = useState<File[]>([]);
   const [, setLocation] = useLocation();
   const messagesEndRef = useRef<HTMLDivElement>(null);
@@ -211,6 +219,7 @@ export function ChatbotButton() {
     setApptSelectionData(null);
     setCdtClarificationData(null);
     setClaimReadyData(null);
+    setPreauthReadyData(null);
     setPendingFiles([]);
   };
 
@@ -471,6 +480,19 @@ export function ChatbotButton() {
         return;
       }
 
+      if (data.action === "preauth_ready" && data.actionData) {
+        const { patient, matchedCodes, siteKey, serviceDate, renderingProvider } = data.actionData;
+        setPreauthReadyData({
+          patient: patient ?? null,
+          matchedCodes: matchedCodes ?? [],
+          siteKey,
+          serviceDate,
+          renderingProvider: renderingProvider ?? null,
+        });
+        setStep("preauth-ready");
+        return;
+      }
+
       setStep("menu");
     } catch {
       replaceLastMsg("Sorry, something went wrong. Please try again.");
@@ -917,6 +939,56 @@ export function ChatbotButton() {
                 );
               })()}
 
+              {/* PreAuth confirmation card */}
+              {step === "preauth-ready" && preauthReadyData && (() => {
+                const [sy, sm, sd] = (preauthReadyData.serviceDate ?? "").split("-");
+                const dateLabel = sy ? `${sm}/${sd}/${sy}` : preauthReadyData.serviceDate;
+                return (
+                  <div className="bg-blue-50 border border-blue-200 rounded-xl p-3 space-y-2">
+                    <p className="text-xs font-semibold text-blue-800">Confirm Pre-Authorization</p>
+                    {preauthReadyData.patient && (
+                      <p className="text-xs text-blue-700 font-medium">
+                        {preauthReadyData.patient.firstName} {preauthReadyData.patient.lastName}
+                      </p>
+                    )}
+                    <p className="text-xs text-gray-500">Tentative date: {dateLabel}</p>
+                    {preauthReadyData.matchedCodes.length > 0 && (
+                      <div className="space-y-0.5 pt-0.5">
+                        {preauthReadyData.matchedCodes.map((c) => (
+                          <p key={c.code} className="text-xs text-gray-700 pl-1">
+                            <span className="font-medium">{c.code}</span>{c.toothNumber ? ` #${c.toothNumber}` : ""} — {c.description}
+                          </p>
+                        ))}
+                      </div>
+                    )}
+                    <div className="flex gap-2 pt-1">
+                      <Button
+                        size="sm"
+                        className="flex-1 h-8 text-xs bg-blue-600 hover:bg-blue-700 text-white"
+                        onClick={() => {
+                          const { patient, matchedCodes, siteKey, serviceDate, renderingProvider } = preauthReadyData;
+                          addMsg("user", "Confirm & open pre-auth");
+                          addMsg("bot", "Opening pre-auth form...");
+                          if (patient?.id && matchedCodes.length > 0) {
+                            sessionStorage.setItem(
+                              "chatbot_preauth_prefill",
+                              JSON.stringify({ codes: matchedCodes, siteKey, serviceDate, renderingProvider: renderingProvider ?? null })
+                            );
+                          }
+                          setChatbotPendingFiles(pendingFiles);
+                          const url = `/claims?newPatient=${patient?.id}&tab=preauth`;
+                          setTimeout(() => { setLocation(url); setOpen(false); resetStep(); }, 600);
+                        }}
+                      >
+                        <FileText className="h-3 w-3 mr-1" />
+                        Confirm &amp; Open PreAuth
+                      </Button>
+                      <Button size="sm" variant="ghost" className="h-8 text-xs" onClick={resetStep}>Cancel</Button>
+                    </div>
+                  </div>
+                );
+              })()}
+
               {/* CDT clarification — unknown procedure terms */}
               {step === "need-cdt-clarification" && cdtClarificationData && (
                 <div className="bg-amber-50 border border-amber-200 rounded-xl p-3 space-y-2">