Fix load_service_components path for sx, market, events

The load_service_components call used dirname twice from
sxc/pages/__init__.py, yielding {service}/sxc/ instead of
{service}/. This meant {service}/sx/*.sx files (layouts, calendar
components, etc.) were never loaded into the component env.

- sx: ~sx-layout-full not found → Unknown component on client
- events: ~events-calendar-grid not found → Unknown component
- market: also fix url_for endpoint for defpage_market_admin
  (mounted on app, not blueprint — no prefix needed)

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

market/sxc/pages/__init__.py

@@ -26,8 +26,9 @@ def _load_market_page_files() -> None:
     import os
     from shared.sx.pages import load_page_dir
     from shared.sx.jinja_bridge import load_service_components
-    base = os.path.dirname(os.path.dirname(__file__))
-    load_service_components(base, service_name="market")
+    sxc_dir = os.path.dirname(os.path.dirname(__file__))       # market/sxc/
+    service_root = os.path.dirname(sxc_dir)                     # market/
+    load_service_components(service_root, service_name="market")
     load_page_dir(os.path.dirname(__file__), "market")
 
 
@@ -163,7 +164,7 @@ async def _desktop_category_nav_sx(ctx: dict, categories: dict, qs: str,
 
     admin_sx = ""
     if rights and rights.get("admin"):
-        admin_href = prefix + url_for("market.admin.defpage_market_admin")
+        admin_href = prefix + url_for("defpage_market_admin")
         admin_sx = await render_to_sx("market-admin-link", href=admin_href, hx_select=hx_select)
 
     return await render_to_sx("market-desktop-category-nav",