docs(expenses): add Tricount link to ledger and itinerary

expenses.md

@@ -1,5 +1,7 @@
 # Expense Ledger
 
+**Tricount:** <https://tricount.com/tOMVasoAGxPeQkMAJP> (opens in the app) — the live ledger; this file is a snapshot.
+
 Source: screenshot of the **LA Rookies** group in Tricount. The screenshot groups all entries under **“Today”** but does not show the calendar date or the split settings. The Tricount group's default currency is **USD**, so all ledger amounts below are recorded in USD.
 
 ## Summary

itinerary.md

@@ -30,6 +30,8 @@
 | [✈️ Flights — KT & VT](bookings/flights-kt-vt.md) | Sep 19 / Oct 3 | — | ✅ Dates confirmed (details later) |
 | [✈️ Flights — MS & LK](bookings/flights-ms.md) | Sep 20 / Oct 4 | — | Round trip YVR ↔ SFO needed · LK away from group Sep 22–27 |
 
+**Expense split:** [`expenses.md`](expenses.md) · [Tricount](https://tricount.com/tOMVasoAGxPeQkMAJP) (opens in the app).
+
 ---
 
 ## Timeline