### What?
Reflects any access control restrictions applied to Auth fields in the
UI. I.e. if `email` has `update: () => false` the field should be
displayed as read-only.
### Why?
Currently any access control that is applied to auth fields is
functional but is not matched within the UI.
For example:
- `password` that does not have read access will not return data, but
the field will still be shown when it should be hidden
- `email` that does not have update access, updating the field and
saving the doc will **not** update the data, but it should be displayed
as read-only so nothing can be filled out and the updating restriction
is made clear
### How?
Passes field permissions through to the Auth fields UI and adds docs
with instructions on how to override auth field access.
#### Testing
Use `access-control` test suite and `auth` collection. Tests added to
`access-control` e2e.
Fixes#11569
### What?
Regression caused by https://github.com/payloadcms/payload/pull/11433
If a beforeChange hook was checking for a missing or undefined `value`
in order to change the value before inserting into the database, data
could be lost.
### Why?
In #11433 the logic for setting the fallback field value was moved above
the logic that cleared the value when access control returned false.
### How?
This change ensures that the fallback value is passed into the
beforeValidate function _and_ still available with the fallback value on
siblingData if access control returns false.
Fixes https://github.com/payloadcms/payload/issues/11543
### What?
The admin panel was not respecting where constraints returned from the
readAccess function.
### Why?
`getEntityPolicies` was always using `find` when looping over the
operations, but `readVersions` should be using `findVersions`.
### How?
When the operation is `readVersions` run the `findVersions` operation.
Fixes https://github.com/payloadcms/payload/issues/11240
Fixes#10180. When logged in as an unauthorized user who cannot access
the admin panel, the user is unable to log out through the prompted
`/admin/logout` page. This was because that page was using an incorrect
API endpoint, reading from `admin.user` instead of `user.collection`
when formatting the route. This page was also able to get stuck in an
infinite loading state when attempting to log out without any user at
all. Now, public users can properly log out and then back in with
another user who might have access. The messaging around this was also
misleading. Instead of displaying the "Unauthorized, you must be logged
in to make this request" message, we now display a new "Unauthorized,
this user does not have access to the admin panel" message for added
clarity.
