Replace 21 Jinja render_template() calls with sx render functions

Phase 1: Wire 16 events routes to existing sx render functions
- slot, slots, ticket_types, ticket_type, calendar_entries,
  calendar_entry, calendar_entry/admin

Phase 2: Orders checkout return (2 calls)
- New orders/sx/checkout.sx with return page components
- New render_checkout_return_page() in orders/sx/sx_components.py

Phase 3: Blog menu items (3 calls)
- New blog/sx/menu_items.sx with search result components
- New render_menu_item_form() and render_page_search_results()
  in blog/sx/sx_components.py

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

events/bp/slot/routes.py

@@ -39,20 +39,16 @@ def register():
         if not slot:
             return await make_response("Not found", 404)
         
+        from shared.sx.page import get_template_context
+        from sx.sx_components import render_slot_page, render_slot_oob
+
+        tctx = await get_template_context()
         if not is_htmx_request():
-          # Normal browser request: full page with layout
-          html = await render_template(
-            "_types/slot/index.html",
-            slot=slot,
-            )
+            html = await render_slot_page(tctx)
+            return await make_response(html)
         else:
-            
-            html = await render_template(
-              "_types/slot/_oob_elements.html",
-              slot=slot,
-            )
-        
-        return await make_response(html)
+            sx_src = await render_slot_oob(tctx)
+            return sx_response(sx_src)
 
 
     @bp.get("/edit/")
@@ -61,13 +57,8 @@ def register():
         slot = await svc_get_slot(g.s, slot_id)
         if not slot:
             return await make_response("Not found", 404)
-        html = await render_template(
-            "_types/slot/_edit.html",
-            slot=slot,
-            #post=g.post_data['post'],
-            #calendar=g.calendar,
-        )
-        return await make_response(html)
+        from sx.sx_components import render_slot_edit_form
+        return sx_response(render_slot_edit_form(slot, g.calendar))
 
     @bp.get("/view/")
     @require_admin