SummerCMS 0.1.24

Fixed

• The tree reorder page keeps one save in flight and ignores stale responses.
• A singleton opens its record from its list route, and the singleton route retries a lost first-or-create race.
• signpost ignores an item URL pattern override that is not a path (signpost.ValidItemPattern).
• The read-only richeditor display is sanitized with DOMPurify.
• The admin Content Security Policy sets form-action and frame-src.