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/utils.py

@@ -22,8 +22,9 @@ _MARKET_DEEP_IDS = [
 
 def _clear_deeper_oob(*keep_ids: str) -> str:
     """Clear all market header rows/children NOT in keep_ids."""
+    from shared.sx.helpers import sx_call
     to_clear = [i for i in _MARKET_DEEP_IDS if i not in keep_ids]
-    return " ".join(f'(div :id "{i}" :sx-swap-oob "outerHTML")' for i in to_clear)
+    return " ".join(sx_call("clear-oob-div", id=i) for i in to_clear)
 
 
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