Replace env free-variable threading with IO-primitive auto-fetch macros

Layout components now self-resolve context (cart-mini, auth-menu, nav-tree,
rights, URLs) via new IO primitives (root-header-ctx, select-colours,
account-nav-ctx, app-rights) and defmacro wrappers (~root-header-auto,
~auth-header-row-auto, ~root-mobile-auto). This eliminates _ctx_to_env(),
HELPER_CSS_CLASSES, and verbose :key threading across all 10 services.

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

market/sxc/pages/helpers.py

@@ -122,8 +122,7 @@ async def _h_all_markets_content(**kw):
     next_url = prefix + url_for("all_markets.markets_fragment", page=page + 1)
 
     cards = await _market_cards_sx(markets, page_info, page, has_more, next_url)
-    content = await _markets_grid(cards)
-    return "(<> " + content + " " + '(div :class "pb-8")' + ")"
+    return await _markets_grid(cards)
 
 
 async def _h_page_markets_content(slug=None, **kw):
@@ -146,15 +145,16 @@ async def _h_page_markets_content(slug=None, **kw):
 
     cards = await _market_cards_sx(markets, {}, page, has_more, next_url,
                                 show_page_badge=False, post_slug=post_slug)
-    content = await _markets_grid(cards)
-    return "(<> " + content + " " + '(div :class "pb-8")' + ")"
+    return await _markets_grid(cards)
 
 
 async def _h_page_admin_content(slug=None, **kw):
     from shared.sx.page import get_template_context
+    from shared.sx.helpers import render_to_sx
+    from shared.sx.parser import SxExpr
     ctx = await get_template_context()
     content = await _markets_admin_panel_sx(ctx)
-    return '(div :id "main-panel" ' + content + ')'
+    return await render_to_sx("market-admin-content-wrap", inner=SxExpr(content))
 
 
 async def _h_market_home_content(page_slug=None, market_slug=None, **kw):