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>

cart/sxc/pages/renders.py

@@ -7,7 +7,7 @@ from .utils import _serialize_order, _serialize_calendar_entry
 
 
 async def render_orders_page(ctx, orders, page, total_pages, search, search_count, url_for_fn, qs_fn):
-    from shared.sx.helpers import render_to_sx, render_to_sx_with_env, _ctx_to_env, search_desktop_sx, search_mobile_sx, full_page_sx
+    from shared.sx.helpers import render_to_sx, render_to_sx_with_env, search_desktop_sx, search_mobile_sx, full_page_sx
     from shared.utils import route_prefix
     ctx["search"] = search
     ctx["search_count"] = search_count
@@ -17,7 +17,7 @@ async def render_orders_page(ctx, orders, page, total_pages, search, search_coun
     order_dicts = [_serialize_order(o) for o in orders]
     content = await render_to_sx("orders-list-content", orders=order_dicts,
         page=page, total_pages=total_pages, rows_url=list_url, detail_url_prefix=detail_url_prefix)
-    header_rows = await render_to_sx_with_env("cart-orders-layout-full", _ctx_to_env(ctx),
+    header_rows = await render_to_sx_with_env("cart-orders-layout-full", {},
         list_url=list_url,
     )
     filt = await render_to_sx("order-list-header", search_mobile=SxExpr(await search_mobile_sx(ctx)))
@@ -49,7 +49,7 @@ async def render_orders_rows(ctx, orders, page, total_pages, url_for_fn, qs_fn):
 
 
 async def render_orders_oob(ctx, orders, page, total_pages, search, search_count, url_for_fn, qs_fn):
-    from shared.sx.helpers import render_to_sx, render_to_sx_with_env, _ctx_to_env, search_desktop_sx, search_mobile_sx, oob_page_sx
+    from shared.sx.helpers import render_to_sx, render_to_sx_with_env, search_desktop_sx, search_mobile_sx, oob_page_sx
     from shared.utils import route_prefix
     ctx["search"] = search
     ctx["search_count"] = search_count
@@ -59,7 +59,7 @@ async def render_orders_oob(ctx, orders, page, total_pages, search, search_count
     order_dicts = [_serialize_order(o) for o in orders]
     content = await render_to_sx("orders-list-content", orders=order_dicts,
         page=page, total_pages=total_pages, rows_url=list_url, detail_url_prefix=detail_url_prefix)
-    oobs = await render_to_sx_with_env("cart-orders-layout-oob", _ctx_to_env(ctx, oob=True),
+    oobs = await render_to_sx_with_env("cart-orders-layout-oob", {},
         list_url=list_url,
     )
     filt = await render_to_sx("order-list-header", search_mobile=SxExpr(await search_mobile_sx(ctx)))
@@ -67,7 +67,7 @@ async def render_orders_oob(ctx, orders, page, total_pages, search, search_count
 
 
 async def render_order_page(ctx, order, calendar_entries, url_for_fn):
-    from shared.sx.helpers import render_to_sx, render_to_sx_with_env, _ctx_to_env, full_page_sx
+    from shared.sx.helpers import render_to_sx, render_to_sx_with_env, full_page_sx
     from shared.utils import route_prefix
     from shared.browser.app.csrf import generate_csrf_token
     pfx = route_prefix()
@@ -80,7 +80,7 @@ async def render_order_page(ctx, order, calendar_entries, url_for_fn):
     main = await render_to_sx("order-detail-content", order=order_data, calendar_entries=cal_data)
     filt = await render_to_sx("order-detail-filter-content", order=order_data,
         list_url=list_url, recheck_url=recheck_url, pay_url=pay_url, csrf=generate_csrf_token())
-    header_rows = await render_to_sx_with_env("cart-order-detail-layout-full", _ctx_to_env(ctx),
+    header_rows = await render_to_sx_with_env("cart-order-detail-layout-full", {},
         list_url=list_url, detail_url=detail_url,
         order_label=f"Order {order.id}",
     )
@@ -88,7 +88,7 @@ async def render_order_page(ctx, order, calendar_entries, url_for_fn):
 
 
 async def render_order_oob(ctx, order, calendar_entries, url_for_fn):
-    from shared.sx.helpers import render_to_sx, render_to_sx_with_env, _ctx_to_env, oob_page_sx
+    from shared.sx.helpers import render_to_sx, render_to_sx_with_env, oob_page_sx
     from shared.utils import route_prefix
     from shared.browser.app.csrf import generate_csrf_token
     pfx = route_prefix()
@@ -101,7 +101,7 @@ async def render_order_oob(ctx, order, calendar_entries, url_for_fn):
     main = await render_to_sx("order-detail-content", order=order_data, calendar_entries=cal_data)
     filt = await render_to_sx("order-detail-filter-content", order=order_data,
         list_url=list_url, recheck_url=recheck_url, pay_url=pay_url, csrf=generate_csrf_token())
-    oobs = await render_to_sx_with_env("cart-order-detail-layout-oob", _ctx_to_env(ctx, oob=True),
+    oobs = await render_to_sx_with_env("cart-order-detail-layout-oob", {},
         detail_url=detail_url,
         order_label=f"Order {order.id}",
     )
@@ -109,11 +109,11 @@ async def render_order_oob(ctx, order, calendar_entries, url_for_fn):
 
 
 async def render_checkout_error_page(ctx, error=None, order=None):
-    from shared.sx.helpers import render_to_sx, render_to_sx_with_env, _ctx_to_env, full_page_sx
+    from shared.sx.helpers import render_to_sx, render_to_sx_with_env, full_page_sx
     from shared.infrastructure.urls import cart_url
     err_msg = error or "Unexpected error while creating the hosted checkout session."
     order_sx = await render_to_sx("checkout-error-order-id", oid=f"#{order.id}") if order else None
-    hdr = await render_to_sx_with_env("layout-root-full", _ctx_to_env(ctx))
+    hdr = await render_to_sx_with_env("layout-root-full", {})
     filt = await render_to_sx("checkout-error-header")
     content = await render_to_sx("checkout-error-content", msg=err_msg,
         order=SxExpr(order_sx) if order_sx else None, back_url=cart_url("/"))