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/cart.sx

@@ -43,3 +43,17 @@
 (defcomp ~market-cart-add-oob (&key id content inner)
   (div :id id :sx-swap-oob "outerHTML"
     (if content content (when inner inner))))
+
+;; Cart added response — composes cart mini + add/remove OOB in sx
+(defcomp ~market-cart-added-response (&key has-count cart-href blog-href logo
+                                      slug action csrf quantity minus-val plus-val)
+  (<>
+    (if has-count
+      (~market-cart-mini-count :href cart-href :count (str has-count))
+      (~market-cart-mini-empty :href blog-href :logo logo))
+    (~market-cart-add-oob :id (str "cart-add-" slug)
+      :inner (if (= (or quantity "0") "0")
+        (~market-cart-add-empty :cart-id (str "cart-" slug) :action action :csrf csrf)
+        (~market-cart-add-quantity :cart-id (str "cart-" slug) :action action :csrf csrf
+          :minus-val minus-val :plus-val plus-val
+          :quantity quantity :cart-href cart-href)))))

market/sx/filters.sx

@@ -271,3 +271,18 @@
       (~market-filter-stickers-from-data :items sticker-data :hx-select hx-select))
     (when brand-data
       (~market-filter-brands-from-data :items brand-data :hx-select hx-select))))
+
+;; Composite mobile filter — eliminates SxExpr nesting in Python (M2)
+(defcomp ~market-mobile-filter-from-data (&key search-bar
+    sort-chip liked-chip label-chips sticker-chips brand-chips
+    sort-data like-data label-data sticker-data brand-data
+    clear-href hx-select)
+  (~market-mobile-filter-summary
+    :search-bar search-bar
+    :chips (~market-mobile-chips-from-data
+      :sort-chip sort-chip :liked-chip liked-chip
+      :label-chips label-chips :sticker-chips sticker-chips :brand-chips brand-chips)
+    :filter (~market-mobile-filter-content-from-data
+      :sort-data sort-data :like-data like-data
+      :label-data label-data :sticker-data sticker-data :brand-data brand-data
+      :clear-href clear-href :hx-select hx-select)))

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")))