Add ticket-to-cart integration

Tickets now appear as cart line items, are included in checkout totals,
confirmed on payment, and displayed on the checkout return page.

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

app.py

@@ -21,10 +21,13 @@ from bp.cart.services import (
     total,
     get_calendar_cart_entries,
     calendar_total,
+    get_ticket_cart_entries,
+    ticket_total,
 )
 from bp.cart.services.page_cart import (
     get_cart_for_page,
     get_calendar_entries_for_page,
+    get_tickets_for_page,
 )
 
 
@@ -53,27 +56,32 @@ async def cart_context() -> dict:
     # Cart app owns cart data — use g.cart from _load_cart
     all_cart = getattr(g, "cart", None) or []
     all_cal = await get_calendar_cart_entries(g.s)
+    all_tickets = await get_ticket_cart_entries(g.s)
 
     # Global counts for cart-mini (always global)
     cart_qty = sum(ci.quantity for ci in all_cart) if all_cart else 0
-    ctx["cart_count"] = cart_qty + len(all_cal)
-    ctx["cart_total"] = (total(all_cart) or 0) + (calendar_total(all_cal) or 0)
+    ctx["cart_count"] = cart_qty + len(all_cal) + len(all_tickets)
+    ctx["cart_total"] = (total(all_cart) or 0) + (calendar_total(all_cal) or 0) + (ticket_total(all_tickets) or 0)
 
     # Page-scoped data when viewing a page cart
     page_post = getattr(g, "page_post", None)
     if page_post:
         page_cart = await get_cart_for_page(g.s, page_post.id)
         page_cal = await get_calendar_entries_for_page(g.s, page_post.id)
+        page_tickets = await get_tickets_for_page(g.s, page_post.id)
         ctx["cart"] = page_cart
         ctx["calendar_cart_entries"] = page_cal
+        ctx["ticket_cart_entries"] = page_tickets
         ctx["page_post"] = page_post
         ctx["page_config"] = getattr(g, "page_config", None)
     else:
         ctx["cart"] = all_cart
         ctx["calendar_cart_entries"] = all_cal
+        ctx["ticket_cart_entries"] = all_tickets
 
     ctx["total"] = total
     ctx["calendar_total"] = calendar_total
+    ctx["ticket_total"] = ticket_total
 
     ctx["menu_items"] = await get_navigation_tree(g.s)