Fix events: use cart-mini fragment instead of local cart template

Events was trying to render _types/cart/_mini.html locally, which only
exists in the cart service. Replace with fetch_fragment("cart", "cart-mini")
calls and add oob param support to the cart-mini fragment.

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

events/bp/calendar_entries/routes.py

@@ -3,7 +3,7 @@ from datetime import datetime, timezone
 from decimal import Decimal
 
 from quart import (
-    request, render_template, render_template_string, make_response,
+    request, render_template, make_response,
     Blueprint, g, redirect, url_for, jsonify,
 )
 
@@ -219,27 +219,17 @@ def register():
             select(sa_func.count()).select_from(CalendarEntry).where(*cal_filters)
         ) or 0
 
-        # Get product cart count via HTTP
         from shared.infrastructure.cart_identity import current_cart_identity
-        from shared.infrastructure.data_client import fetch_data
-        from shared.contracts.dtos import CartSummaryDTO, dto_from_dict
+        from shared.infrastructure.fragments import fetch_fragment
         ident = current_cart_identity()
-        summary_params = {}
+        frag_params = {"oob": "1"}
         if ident["user_id"] is not None:
-            summary_params["user_id"] = ident["user_id"]
+            frag_params["user_id"] = str(ident["user_id"])
         if ident["session_id"] is not None:
-            summary_params["session_id"] = ident["session_id"]
-        raw_summary = await fetch_data("cart", "cart-summary", params=summary_params, required=False)
-        cart_summary = dto_from_dict(CartSummaryDTO, raw_summary) if raw_summary else CartSummaryDTO()
-        product_count = cart_summary.count
-        total_count = product_count + cal_count
+            frag_params["session_id"] = ident["session_id"]
 
         html = await render_template("_types/day/_main_panel.html")
-        mini_html = await render_template_string(
-            '{% from "_types/cart/_mini.html" import mini with context %}'
-            '{{ mini(oob="true") }}',
-            cart_count=total_count,
-        )
+        mini_html = await fetch_fragment("cart", "cart-mini", params=frag_params, required=False)
         return await make_response(html + mini_html, 200)
     
     @bp.get("/add/")