feat: AI chat claim confirmation, CDT alias learning, and eligibility auto-trigger fixes

- Claim flow: show green confirm card (patient, CDT codes, service date) before Selenium starts
- CDT lookup: add DIRECT_CODE_MAP + ALIAS_MAP with 60+ dental abbreviations from office fee schedule
  (2BW→D0272, 4BW→D0274, PA→D0220, FL→D1208, RCT codes, composite tooth#/surface parser, etc.)
- Composite filling parser: auto-map "#29 OB" → D2392 based on tooth# (front/back) and surface count
- Ask-and-learn: unknown CDT terms block claim and ask user; answer saved to DB alias map for future use
- Cancel on confirm card returns to chat (not full reset) so user can correct and retry
- Eligibility auto-trigger fix: reset autoTriggeredRef when autoTrigger resets to false so second
  chatbot eligibility check on same page visit fires correctly (all 5 provider buttons fixed)
- check_eligibility by name now returns eligibility_id_ready with correct siteKey for non-MH patients
- DDMA/CCA/United/Tufts fee schedules updated with office prices (single Price field, no age split)
- getCodeMap case-insensitive matching fix (ddma/cca/etc. now correctly selected)
- Family plan member disambiguation: insuranceId+DOB composite lookup prevents overwriting siblings
- AI chat date fix: send clientDate from browser to avoid UTC midnight rollover (EST→wrong day)
- AI prompt: appointmentDate extracted for claim_only intent when user says "today" or a date

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

apps/Backend/src/routes/ai-settings.ts

@@ -251,13 +251,32 @@ router.put("/cdt-aliases", async (req: Request, res: Response): Promise<any> =>
   }
 });
 
+// POST /api/ai/cdt-aliases/add  — add/update a single alias without overwriting others
+router.post("/cdt-aliases/add", async (req: Request, res: Response): Promise<any> => {
+  try {
+    const userId = req.user?.id;
+    if (!userId) return res.status(401).json({ message: "Unauthorized" });
+    const { phrase, cdtCode } = req.body;
+    if (typeof phrase !== "string" || typeof cdtCode !== "string") {
+      return res.status(400).json({ message: "Body must be { phrase, cdtCode }" });
+    }
+    const existing = await storage.getCdtAliases(userId);
+    const newEntry = { phrase: phrase.trim().toLowerCase(), cdtCode: cdtCode.trim().toUpperCase() };
+    const updated = [...existing.filter((a) => a.phrase !== newEntry.phrase), newEntry];
+    await storage.saveCdtAliases(userId, updated);
+    return res.status(200).json(newEntry);
+  } catch (err) {
+    return res.status(500).json({ error: "Failed to add CDT alias", details: String(err) });
+  }
+});
+
 // POST /api/ai/internal-chat
 router.post("/internal-chat", async (req: Request, res: Response): Promise<any> => {
   try {
     const userId = req.user?.id;
     if (!userId) return res.status(401).json({ message: "Unauthorized" });
 
-    const { message, history } = req.body;
+    const { message, history, clientDate } = req.body;
     if (!message?.trim()) return res.status(400).json({ message: "message is required" });
 
     const aiSettings = await storage.getAiSettings(userId);
@@ -279,7 +298,8 @@ router.post("/internal-chat", async (req: Request, res: Response): Promise<any>
       extraSystemPrompt || undefined,
       Array.isArray(history) ? history : [],
       activeAi.provider,
-      activeAi.model
+      activeAi.model,
+      typeof clientDate === "string" ? clientDate : undefined
     );
 
     const response = await runInternalChatWorkflow(classification, userId, storage, customAliases);