Fix stale cart count: commit transaction before cross-service fragment fetch

The cart-mini fragment relies on cart calling back to events for calendar/
ticket counts. Without committing first, the callback runs in a separate
transaction and misses the just-added entry or ticket adjustment.

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

events/bp/all_events/routes.py

@@ -125,7 +125,10 @@ def register() -> Blueprint:
         # Load entry DTO for the widget template
         entry = await services.calendar.entry_by_id(g.s, entry_id)
 
-        # Fetch OOB cart-mini fragment from cart service
+        # Commit so cross-service calls see the updated tickets
+        await g.tx.commit()
+        g.tx = await g.s.begin()
+
         from shared.infrastructure.fragments import fetch_fragment
         frag_params = {"oob": "1"}
         if ident["user_id"] is not None: