docs: update changelog for v1.3.1

CHANGELOG.md

@@ -13,24 +13,28 @@ adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ### Fixed
 
-- Fixed File Manager operations on directories without a `.keep` marker. A directory a file was
-  uploaded into, or one that exists in the bucket but was not created through the app, was listed
-  but could not be renamed, deleted or resolved (`E_DIR_NOT_FOUND`); directory existence now falls
-  back to the prefix holding any entry instead of relying on the marker alone.
+### Removed
+
+## [1.3.1] - 2026-08-31
+
+### Fixed
+
+- Fixed Web Studio site settings rejecting empty optional fields. The backend bodyparser converts
+  empty strings to `null`, so a cleared menu title, footer copyright or legal path failed
+  validation; those fields are now optional in the vine schema (stored without the key) and the
+  admin maps them back to empty strings via `SiteSettingsMapper`.
+- Backend validation errors on the settings page no longer disappear silently: the shared 422
+  handler skips them expecting the caller to map field errors, which the page never did. Structured
+  field errors are now set on the matching form inputs, the tab holding the first error is opened,
+  and message-only 422s surface as a toast.
 - Fixed renaming or deleting a folder destroying sibling folders whose name shares its prefix
   (renaming `aa` overwrote and then deleted `aab`). Drive strips the trailing slash off a listing
   prefix, so a directory's contents are now filtered on the real `<path>/` prefix, and the S3
   service deletes the listed keys instead of passing that prefix to `deleteAll`.
-- Moving, copying and deleting a folder now follow the listing pagination token, so folders holding
-  more than 1000 objects are no longer processed only in part.
-- Fixed `getEntry` raising a bare `Error` (HTTP 500) for a path that is neither a file nor a
-  directory; it now raises the `E_DIR_NOT_FOUND` 404.
 - Fixed the web container running against the host's `node_modules`: the `web` service keeps
   `apps/web/node_modules` in an anonymous volume, so the bind mount no longer shadows the
   dependencies installed in the image.
 
-### Removed
-
 ## [1.3.0] - 2026-08-28
 
 ### Added