Move remaining 19 rendering functions from the 2487-line
sx_components.py to their direct callers:
- menu_items/routes.py: menu item form, page search, nav OOB
- post/admin/routes.py: calendar view, associated entries, nav OOB
- sxc/pages/__init__.py: editor panel, post data inspector, preview,
entries browser, settings form, edit page editor
- bp/blog/routes.py: inline new post page composition
Move load_service_components() call from sx_components module-level
to setup_blog_pages() so .sx files still load at startup.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>