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/SeleniumService/selenium_UnitedDH_claimSubmitWorker.py

@@ -1093,7 +1093,13 @@ class AutomationUnitedDHClaimSubmit:
                     )
                     self.driver.execute_script("arguments[0].style.display='block';", file_input)
                     file_input.send_keys(abs_path)
-                    time.sleep(1.5)
+                    WebDriverWait(self.driver, 60).until(
+                        EC.element_to_be_clickable((By.XPATH,
+                            "//button[contains(@class,'btn-primary') and contains(normalize-space(text()),'Submit Claim')] | "
+                            "//button[normalize-space(text())='Submit Claim'] | "
+                            "//button[contains(normalize-space(.),'Submit Claim')]"
+                        ))
+                    )
                     print(f"[UnitedDH Claim] step7: Attached: {os.path.basename(abs_path)}")
                     attached += 1
                 except Exception as e: