fix: close browser window after Deltains claim completes

Session still persists via the Chrome profile/saved cookies, so
closing the window doesn't force a re-login or OTP next time.

apps/SeleniumService/helpers_deltains_claim.py

@@ -304,8 +304,9 @@ async def start_deltains_claim_run(sid: str, data: dict, url: str):
         s["result"] = result
         s["message"] = "completed"
 
-        # Leave the browser window open on the "My claims" page (persistent session)
-        print("[Deltains Claim] Claim completed - browser left open on My claims page")
+        # Close the browser window after claim (session preserved in profile/cookies)
+        _close_browser(bot)
+        print("[Deltains Claim] Browser closed - session preserved in profile")
 
         asyncio.create_task(_remove_session_later(sid, 60))
         return result