stays: record LA check-in completion

TODO.md

@@ -13,10 +13,11 @@ Open items before and during the trip. Tick and date when done.
 - [ ] **Print the pass PDF** after purchase and carry the physical copy.
   An unstaffed entrance requires a physical pass or printed PDF to be
   displayed. Ask the ranger for a physical pass at the first staffed entry.
-- [ ] **KT: complete the LA DTLA online check-in form** — host check-in guide
+- [x] **KT: complete the LA DTLA online check-in form** — completed 2026-09-26;
+  host confirmed the reservation was all set. Host check-in guide
   received Sep 24; apartment code and parking instructions are recorded in the
   [booking file](bookings/stays/airbnb-la-dtla.md). The entry code is activated
-  only after the form is submitted. Use the [Hostaway portal](https://guest-portal.hostaway.com/65596088/dxYlP4ov/check-in).
+  after the form is submitted. See the [completion source](sources/stays/2026-09-26_Airbnb_LA_DTLA_Checkin_Completion.md).
 - [ ] **MS: assign Air Canada seats** for the YVR ↔ SFO flights.
   See [`flights-ms.md`](bookings/transport/flights-ms.md).
 - [x] **MS: move today's SIXT pickup after the flight delay** — completed;