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>

blog/sxc/pages/helpers.py

@@ -140,7 +140,8 @@ async def _h_editor_page_content(**kw):
 
 async def _h_post_admin_content(slug=None, **kw):
     await _ensure_post_data(slug)
-    return '(div :class "pb-8")'
+    from shared.sx.helpers import render_to_sx
+    return await render_to_sx("blog-admin-placeholder")
 
 
 async def _h_post_data_content(slug=None, **kw):
@@ -264,7 +265,7 @@ async def _h_post_preview_content(slug=None, **kw):
     from quart import g
     from shared.services.registry import services
     from shared.sx.helpers import render_to_sx
-    from shared.sx.parser import SxExpr, serialize as sx_serialize
+    from shared.sx.parser import SxExpr
 
     preview = await services.blog_page.preview_data(g.s)
 
@@ -276,16 +277,16 @@ async def _h_post_preview_content(slug=None, **kw):
         sections.append(await render_to_sx("blog-preview-section",
             title="Lexical JSON", content=SxExpr(preview["json_pretty"])))
     if preview.get("sx_rendered"):
-        rendered_sx = f'(div :class "blog-content prose max-w-none" (raw! {sx_serialize(preview["sx_rendered"])}))'
+        rendered_sx = await render_to_sx("blog-preview-rendered", html=preview["sx_rendered"])
         sections.append(await render_to_sx("blog-preview-section",
             title="SX Rendered", content=SxExpr(rendered_sx)))
     if preview.get("lex_rendered"):
-        rendered_sx = f'(div :class "blog-content prose max-w-none" (raw! {sx_serialize(preview["lex_rendered"])}))'
+        rendered_sx = await render_to_sx("blog-preview-rendered", html=preview["lex_rendered"])
         sections.append(await render_to_sx("blog-preview-section",
             title="Lexical Rendered", content=SxExpr(rendered_sx)))
 
     if not sections:
-        return '(div :class "p-8 text-stone-500" "No content to preview.")'
+        return await render_to_sx("blog-preview-empty")
 
     inner = " ".join(sections)
     return await render_to_sx("blog-preview-panel", sections=SxExpr(f"(<> {inner})"))

blog/sxc/pages/layouts.py

@@ -8,15 +8,6 @@ from typing import Any
 # Header helpers (moved from sx_components — thin render_to_sx wrappers)
 # ---------------------------------------------------------------------------
 
-async def _blog_header_sx(ctx: dict, *, oob: bool = False) -> str:
-    from shared.sx.helpers import render_to_sx
-    from shared.sx.parser import SxExpr
-    return await render_to_sx("menu-row-sx",
-        id="blog-row", level=1,
-        link_label_content=SxExpr("(div)"),
-        child_id="blog-header-child", oob=oob)
-
-
 async def _settings_header_sx(ctx: dict, *, oob: bool = False) -> str:
     from shared.sx.helpers import render_to_sx
     from shared.sx.parser import SxExpr
@@ -36,8 +27,7 @@ async def _settings_header_sx(ctx: dict, *, oob: bool = False) -> str:
 
 async def _settings_nav_sx(ctx: dict) -> str:
     from shared.sx.helpers import render_to_sx
-    return await render_to_sx("blog-settings-nav",
-        select_colours=ctx.get("select_colours", ""))
+    return await render_to_sx("blog-settings-nav")
 
 
 async def _sub_settings_header_sx(row_id: str, child_id: str, href: str,
@@ -76,33 +66,29 @@ def _register_blog_layouts() -> None:
 # --- Blog layout (root + blog header) ---
 
 async def _blog_full(ctx: dict, **kw: Any) -> str:
-    from shared.sx.helpers import render_to_sx_with_env, _ctx_to_env
-    from shared.sx.parser import SxExpr
-    return await render_to_sx_with_env("blog-layout-full", _ctx_to_env(ctx),
-        blog_header=SxExpr(await _blog_header_sx(ctx)))
+    from shared.sx.helpers import render_to_sx_with_env
+    return await render_to_sx_with_env("blog-layout-full", {})
 
 
 async def _blog_oob(ctx: dict, **kw: Any) -> str:
-    from shared.sx.helpers import render_to_sx_with_env, _ctx_to_env, oob_header_sx
-    from shared.sx.parser import SxExpr
-    rows = await render_to_sx_with_env("blog-layout-full", _ctx_to_env(ctx),
-        blog_header=SxExpr(await _blog_header_sx(ctx)))
+    from shared.sx.helpers import render_to_sx_with_env, oob_header_sx
+    rows = await render_to_sx_with_env("blog-layout-full", {})
     return await oob_header_sx("root-header-child", "blog-header-child", rows)
 
 
 # --- Settings layout (root + settings header) ---
 
 async def _settings_full(ctx: dict, **kw: Any) -> str:
-    from shared.sx.helpers import render_to_sx_with_env, _ctx_to_env
+    from shared.sx.helpers import render_to_sx_with_env
     from shared.sx.parser import SxExpr
-    return await render_to_sx_with_env("settings-layout-full", _ctx_to_env(ctx),
+    return await render_to_sx_with_env("settings-layout-full", {},
         settings_header=SxExpr(await _settings_header_sx(ctx)))
 
 
 async def _settings_oob(ctx: dict, **kw: Any) -> str:
-    from shared.sx.helpers import render_to_sx_with_env, _ctx_to_env, oob_header_sx
+    from shared.sx.helpers import render_to_sx_with_env, oob_header_sx
     from shared.sx.parser import SxExpr
-    rows = await render_to_sx_with_env("settings-layout-full", _ctx_to_env(ctx),
+    rows = await render_to_sx_with_env("settings-layout-full", {},
         settings_header=SxExpr(await _settings_header_sx(ctx)))
     return await oob_header_sx("root-header-child", "root-settings-header-child", rows)
 
@@ -115,10 +101,10 @@ async def _settings_mobile(ctx: dict, **kw: Any) -> str:
 
 async def _sub_settings_full(ctx: dict, row_id: str, child_id: str,
                        endpoint: str, icon: str, label: str) -> str:
-    from shared.sx.helpers import render_to_sx_with_env, _ctx_to_env
+    from shared.sx.helpers import render_to_sx_with_env
     from shared.sx.parser import SxExpr
     from quart import url_for as qurl
-    return await render_to_sx_with_env("sub-settings-layout-full", _ctx_to_env(ctx),
+    return await render_to_sx_with_env("sub-settings-layout-full", {},
         settings_header=SxExpr(await _settings_header_sx(ctx)),
         sub_header=SxExpr(await _sub_settings_header_sx(
             row_id, child_id, qurl(endpoint), icon, label, ctx)))
@@ -190,10 +176,10 @@ async def _tag_groups_oob(ctx: dict, **kw: Any) -> str:
 
 async def _tag_group_edit_full(ctx: dict, **kw: Any) -> str:
     from quart import request, url_for as qurl
-    from shared.sx.helpers import render_to_sx_with_env, _ctx_to_env
+    from shared.sx.helpers import render_to_sx_with_env
     from shared.sx.parser import SxExpr
     g_id = (request.view_args or {}).get("id")
-    return await render_to_sx_with_env("sub-settings-layout-full", _ctx_to_env(ctx),
+    return await render_to_sx_with_env("sub-settings-layout-full", {},
         settings_header=SxExpr(await _settings_header_sx(ctx)),
         sub_header=SxExpr(await _sub_settings_header_sx(
             "tag-groups-row", "tag-groups-header-child",