Move events/market/blog composition from Python to .sx defcomps (Phase 9)

Continues the pattern of eliminating Python sx_call tree-building in favour
of data-driven .sx defcomps. POST/PUT/DELETE routes now pass plain data
(dicts, lists, scalars) and let .sx handle iteration, conditionals, and
layout via map/let/when/if. Single response components wrap OOB swaps.

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

market/sx/layouts.sx

@@ -96,10 +96,37 @@
   (<> (~root-header-auto)
     (~header-child-sx :inner (<> post-header market-header product-header admin-header))))
 
-;; OOB wrappers
+;; OOB wrappers — compose headers + clear divs in sx (no Python concatenation)
+
 (defcomp ~market-oob-wrap (&key parts)
   (<> parts))
 
+(defcomp ~market-clear-product-oob ()
+  "Clear admin-level OOB divs when rendering product detail."
+  (<>
+    (~clear-oob-div :id "product-admin-row")
+    (~clear-oob-div :id "product-admin-header-child")
+    (~clear-oob-div :id "market-admin-row")
+    (~clear-oob-div :id "market-admin-header-child")
+    (~clear-oob-div :id "post-admin-row")
+    (~clear-oob-div :id "post-admin-header-child")))
+
+(defcomp ~market-clear-product-admin-oob ()
+  "Clear deeper OOB divs when rendering product admin."
+  (<>
+    (~clear-oob-div :id "market-admin-row")
+    (~clear-oob-div :id "market-admin-header-child")
+    (~clear-oob-div :id "post-admin-row")
+    (~clear-oob-div :id "post-admin-header-child")))
+
+(defcomp ~market-product-oob (&key market-header oob-header)
+  "Product detail OOB: market header + product header + clear deeper."
+  (<> market-header oob-header (~market-clear-product-oob)))
+
+(defcomp ~market-product-admin-oob (&key product-header oob-header)
+  "Product admin OOB: product header + admin header + clear deeper."
+  (<> product-header oob-header (~market-clear-product-admin-oob)))
+
 ;; Content wrappers
 (defcomp ~market-content-padded (&key content)
   (<> content (div :class "pb-8")))