Eliminate payments sub-admin row in cart, show selection on admin label

Same pattern as blog: remove the level-3 payments header row, instead
show "payments" in white text next to "admin" on the admin row.

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

cart/sexp/sexp_components.py

@@ -8,6 +8,7 @@ from __future__ import annotations
 
 import os
 from typing import Any
+from markupsafe import escape
 
 from shared.sexp.jinja_bridge import render, load_service_components
 from shared.sexp.helpers import (
@@ -722,25 +723,19 @@ async def render_checkout_error_page(ctx: dict, error: str | None = None, order:
 # Page admin (/<page_slug>/admin/)
 # ---------------------------------------------------------------------------
 
-def _cart_page_admin_header_html(ctx: dict, page_post: Any, *, oob: bool = False) -> str:
+def _cart_page_admin_header_html(ctx: dict, page_post: Any, *, oob: bool = False,
+                                  selected: str = "") -> str:
     """Build the page-level admin header row."""
     from quart import url_for
     link_href = url_for("page_admin.admin")
+    label_html = '<i class="fa fa-cog" aria-hidden="true"></i> admin'
+    if selected:
+        label_html += f' <span class="text-white">{escape(selected)}</span>'
     return render("menu-row", id="page-admin-row", level=2, colour="sky",
-                  link_href=link_href, link_label="admin", icon="fa fa-cog",
+                  link_href=link_href, link_label_html=label_html,
                   child_id="page-admin-header-child", oob=oob)
 
 
-def _cart_payments_header_html(ctx: dict, *, oob: bool = False) -> str:
-    """Build the payments section header row."""
-    from quart import url_for
-    link_href = url_for("page_admin.payments")
-    return render("menu-row", id="payments-row", level=3, colour="sky",
-                  link_href=link_href, link_label="Payments",
-                  icon="fa fa-credit-card",
-                  child_id="payments-header-child", oob=oob)
-
-
 def _cart_admin_main_panel_html(ctx: dict) -> str:
     """Admin overview panel — links to sub-admin pages."""
     from quart import url_for
@@ -812,9 +807,8 @@ async def render_cart_payments_page(ctx: dict, page_post: Any) -> str:
     """Full page: payments config."""
     content = _cart_payments_main_panel_html(ctx)
     hdr = root_header_html(ctx)
-    admin_hdr = _cart_page_admin_header_html(ctx, page_post)
+    admin_hdr = _cart_page_admin_header_html(ctx, page_post, selected="payments")
-    payments_hdr = _cart_payments_header_html(ctx)
+    child = _page_cart_header_html(ctx, page_post) + admin_hdr
-    child = _page_cart_header_html(ctx, page_post) + admin_hdr + payments_hdr
     hdr += render("cart-header-child-nested",
                   outer_html=_cart_header_html(ctx), inner_html=child)
     return full_page(ctx, header_rows_html=hdr, content_html=content)
@@ -823,13 +817,12 @@ async def render_cart_payments_page(ctx: dict, page_post: Any) -> str:
 async def render_cart_payments_oob(ctx: dict, page_post: Any) -> str:
     """OOB response: payments config."""
     content = _cart_payments_main_panel_html(ctx)
-    admin_hdr = _cart_page_admin_header_html(ctx, page_post)
+    admin_hdr = _cart_page_admin_header_html(ctx, page_post, selected="payments")
-    payments_hdr = _cart_payments_header_html(ctx)
     oobs = (
-        _cart_payments_header_html(ctx, oob=True)
+        _cart_page_admin_header_html(ctx, page_post, oob=True, selected="payments")
         + render("cart-header-child-oob",
                  inner_html=_page_cart_header_html(ctx, page_post)
-                 + admin_hdr + payments_hdr)
+                 + admin_hdr)
         + _cart_header_html(ctx, oob=True)
         + root_header_html(ctx, oob=True)
     )