Move SX construction from Python to .sx defcomps (phases 0-4)

Eliminate Python s-expression string building across account, orders,
federation, and cart services. Visual rendering logic now lives entirely
in .sx defcomp components; Python files contain only data serialization,
header/layout wiring, and thin wrappers that call defcomps.

Phase 0: Shared DRY extraction — auth/orders header defcomps, format-decimal/
pluralize/escape/route-prefix primitives.
Phase 1: Account — dashboard, newsletters, login/device/check-email content.
Phase 2: Orders — order list, detail, filter, checkout return assembled defcomps.
Phase 3: Federation — social nav, post cards, timeline, search, actors,
notifications, compose, profile assembled defcomps.
Phase 4: Cart — overview, page cart items/calendar/tickets/summary, admin,
payments assembled defcomps; orders rendering reuses Phase 2 shared defcomps.

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

account/sxc/pages/__init__.py

@@ -27,28 +27,41 @@ def _register_account_layouts() -> None:
 
 
 def _account_full(ctx: dict, **kw: Any) -> str:
-    from shared.sx.helpers import root_header_sx, header_child_sx
-    from sx.sx_components import _auth_header_sx
+    from shared.sx.helpers import root_header_sx, header_child_sx, call_url, sx_call, SxExpr
 
     root_hdr = root_header_sx(ctx)
-    hdr_child = header_child_sx(_auth_header_sx(ctx))
+    auth_hdr = sx_call("auth-header-row",
+        account_url=call_url(ctx, "account_url", ""),
+        select_colours=ctx.get("select_colours", ""),
+        account_nav=_as_sx_nav(ctx),
+    )
+    hdr_child = header_child_sx(auth_hdr)
     return "(<> " + root_hdr + " " + hdr_child + ")"
 
 
 def _account_oob(ctx: dict, **kw: Any) -> str:
-    from shared.sx.helpers import root_header_sx
-    from sx.sx_components import _auth_header_sx
+    from shared.sx.helpers import root_header_sx, call_url, sx_call
 
-    return "(<> " + _auth_header_sx(ctx, oob=True) + " " + root_header_sx(ctx, oob=True) + ")"
+    auth_hdr = sx_call("auth-header-row",
+        account_url=call_url(ctx, "account_url", ""),
+        select_colours=ctx.get("select_colours", ""),
+        account_nav=_as_sx_nav(ctx),
+        oob=True,
+    )
+    return "(<> " + auth_hdr + " " + root_header_sx(ctx, oob=True) + ")"
 
 
 def _account_mobile(ctx: dict, **kw: Any) -> str:
-    from shared.sx.helpers import mobile_menu_sx, mobile_root_nav_sx, sx_call, SxExpr
-    from sx.sx_components import _auth_nav_mobile_sx
+    from shared.sx.helpers import mobile_menu_sx, mobile_root_nav_sx, sx_call, SxExpr, call_url
     ctx = _inject_account_nav(ctx)
+    nav_items = sx_call("auth-nav-items",
+        account_url=call_url(ctx, "account_url", ""),
+        select_colours=ctx.get("select_colours", ""),
+        account_nav=_as_sx_nav(ctx),
+    )
     auth_section = sx_call("mobile-menu-section",
         label="account", href="/", level=1, colour="sky",
-        items=SxExpr(_auth_nav_mobile_sx(ctx)))
+        items=SxExpr(nav_items))
     return mobile_menu_sx(auth_section, mobile_root_nav_sx(ctx))
 
 
@@ -61,6 +74,13 @@ def _inject_account_nav(ctx: dict) -> dict:
     return ctx
 
 
+def _as_sx_nav(ctx: dict) -> Any:
+    """Convert account_nav fragment to SxExpr for use in sx_call."""
+    from shared.sx.helpers import _as_sx
+    ctx = _inject_account_nav(ctx)
+    return _as_sx(ctx.get("account_nav"))
+
+
 # ---------------------------------------------------------------------------
 # Page helpers
 # ---------------------------------------------------------------------------
@@ -69,22 +89,19 @@ def _register_account_helpers() -> None:
     from shared.sx.pages import register_page_helpers
 
     register_page_helpers("account", {
-        "account-content": _h_account_content,
         "newsletters-content": _h_newsletters_content,
         "fragment-content": _h_fragment_content,
     })
 
 
-def _h_account_content(**kw):
-    from sx.sx_components import _account_main_panel_sx
-    return _account_main_panel_sx({})
-
-
 async def _h_newsletters_content(**kw):
+    """Fetch newsletter data, return assembled defcomp call."""
     from quart import g
     from sqlalchemy import select
     from shared.models import UserNewsletter
     from shared.models.ghost_membership_entities import GhostNewsletter
+    from shared.sx.helpers import sx_call, SxExpr
+    from shared.sx.parser import serialize
 
     result = await g.s.execute(
         select(GhostNewsletter).order_by(GhostNewsletter.name)
@@ -102,20 +119,21 @@ async def _h_newsletters_content(**kw):
     for nl in all_newsletters:
         un = user_subs.get(nl.id)
         newsletter_list.append({
-            "newsletter": nl,
-            "un": un,
+            "newsletter": {"id": nl.id, "name": nl.name, "description": nl.description},
+            "un": {"newsletter_id": un.newsletter_id, "subscribed": un.subscribed} if un else None,
             "subscribed": un.subscribed if un else False,
         })
 
-    if not newsletter_list:
-        from shared.sx.helpers import sx_call
-        return sx_call("account-newsletter-empty")
-    from sx.sx_components import _newsletters_panel_sx
-    ctx = {"account_url": getattr(g, "_account_url", None)}
-    if ctx["account_url"] is None:
-        from shared.infrastructure.urls import account_url
-        ctx["account_url"] = account_url
-    return _newsletters_panel_sx(ctx, newsletter_list)
+    account_url = getattr(g, "_account_url", None)
+    if account_url is None:
+        from shared.infrastructure.urls import account_url as _account_url
+        account_url = _account_url
+    # Call account_url to get the base URL string
+    account_url_str = account_url("") if callable(account_url) else str(account_url or "")
+
+    return sx_call("account-newsletters-content",
+        newsletter_list=SxExpr(serialize(newsletter_list)),
+        account_url=account_url_str)
 
 
 async def _h_fragment_content(slug=None, **kw):

account/sxc/pages/account.sx

@@ -8,7 +8,7 @@
   :path "/"
   :auth :login
   :layout :account
-  :content (account-content))
+  :content (~account-dashboard-content))
 
 ;; ---------------------------------------------------------------------------
 ;; Newsletters