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>

orders/bp/orders/routes.py

@@ -73,11 +73,41 @@ def register(url_prefix: str) -> Blueprint:
         result = await g.s.execute(stmt)
         orders = result.scalars().all()
 
-        from sx.sx_components import _orders_rows_sx
-        from shared.sx.helpers import sx_response
+        from shared.sx.helpers import sx_response, sx_call, SxExpr
+        from shared.sx.parser import serialize
+        from shared.utils import route_prefix
 
+        pfx = route_prefix()
+        order_dicts = []
+        for o in orders:
+            order_dicts.append({
+                "id": o.id,
+                "status": o.status or "pending",
+                "created_at_formatted": o.created_at.strftime("%-d %b %Y, %H:%M") if o.created_at else "\u2014",
+                "description": o.description or "",
+                "currency": o.currency or "GBP",
+                "total_formatted": f"{o.total_amount or 0:.2f}",
+            })
+
+        detail_prefix = pfx + url_for("orders.defpage_order_detail", order_id=0).rsplit("0/", 1)[0]
         qs_fn = makeqs_factory()
-        sx_src = _orders_rows_sx(orders, page, total_pages, url_for, qs_fn)
+        rows_url = pfx + url_for("orders.orders_rows")
+
+        # Build just the rows fragment (not full table) for infinite scroll
+        parts = []
+        for od in order_dicts:
+            parts.append(sx_call("order-row-pair",
+                order=SxExpr(serialize(od)),
+                detail_url_prefix=detail_prefix))
+        if page < total_pages:
+            parts.append(sx_call("infinite-scroll",
+                url=rows_url + qs_fn(page=page + 1),
+                page=page, total_pages=total_pages,
+                id_prefix="orders", colspan=5))
+        else:
+            parts.append(sx_call("order-end-row"))
+        sx_src = "(<> " + " ".join(parts) + ")"
+
         resp = sx_response(sx_src)
         resp.headers["Hx-Push-Url"] = _current_url_without_page()
         return _vary(resp)