feat: add PreAuth tab, preauth selenium flow, and PreAuth No column

- Insurance Forms modal: split into Insurance Claim / PreAuth tabs
- PreAuth tab: same patient info + service lines, no toggle/direct combos
- Excluded Recalls & New Patients, Composite Fillings (Front/Back), Pedo from PreAuth combos
- Extractions: replaced Simple/Surg/Baby Teeth EXT with Full Bony EXT (D7240)
- MH PreAuth button: rewritten selenium worker to use masshealth-dental.org,
  selects Dental Prior Authorization (2nd option), skips Date of Service field
- agent.py: convert pdf_path to pdf_url for /claim-pre-auth endpoint
- nginx + Express: raise body size limit to 50mb (fix 413 errors)
- DB schema: appointmentId optional on Claim, add preAuthNumber field, add PREAUTH status
- Backend: create PREAUTH claim record on preauth submit, save preAuthNumber on completion
- Claims table: add PreAuth No column (blue) next to Claim No

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

apps/Frontend/src/pages/claims-page.tsx

@@ -443,17 +443,27 @@ export default function ClaimsPage() {
       // Invalidate appointments so the schedule page picks up the new claim color
       queryClient.invalidateQueries({ queryKey: QK_APPOINTMENTS_BASE });
 
+      const isPreAuth = groupTitleKey === "INSURANCE_CLAIM_PREAUTH";
+      const preAuthNumber = data.preAuthNumber ?? data.result?.preAuthNumber ?? null;
+
       dispatch(
         setTaskStatus({
           key: "claimSubmit",
           status: "success",
-          message: "Claim submitted & PDF downloaded successfully.",
+          message: isPreAuth
+            ? `PreAuth submitted & PDF saved.${preAuthNumber ? ` PreAuth #: ${preAuthNumber}` : ""}`
+            : "Claim submitted & PDF downloaded successfully.",
         })
       );
 
       toast({
-        title: "Success",
-        description: "Claim submitted successfully! PDF saved to Documents page.",
+        title: isPreAuth ? "PreAuth Submitted" : "Success",
+        description: isPreAuth
+          ? preAuthNumber
+            ? `PreAuth Number: ${preAuthNumber} — PDF saved to Documents.`
+            : "PreAuth submitted! PDF saved to Documents page."
+          : "Claim submitted successfully! PDF saved to Documents page.",
+        duration: isPreAuth ? 10000 : 5000,
       });
 
       // Pop up the final PDF so the user doesn't need to navigate to Documents