Fix RichEditor type error when saving form without editing the field

[iotron]

Summary

This PR fixes the TypeError: Argument #2 ($rawState) must be of type ?array, string given error that occurs when saving a form that contains a RichEditor field in HTML mode (not using ->json()) without editing that field.

Related issues:

• [v4.x] Error on testing a RichEditor component #17472
• RichEditor error in repeater #18017

Problem

When a RichEditor stores content as HTML (the default mode), the beforeStateDehydrated callback registered in setUp() expects ?array $rawState. However, when the form is saved without editing the RichEditor field:

1. callAfterStateUpdated() is NOT called (since the field wasn't updated)
2. callBeforeStateDehydrated() IS called (as part of the form save process)
3. getRawState() returns the HTML string from the database
4. The callback receives a string instead of an array, causing the type error

The existing fix in PR #17762 added state normalization to callAfterStateUpdated(), which only runs when the RichEditor field itself is edited. This doesn't cover the case where other fields are edited but the RichEditor is left untouched.

Solution

Add the same state normalization logic to callBeforeStateDehydrated(), which runs during every form save regardless of which fields were edited. This ensures the raw state is converted to the expected array format before the beforeStateDehydrated callback is invoked.

Test Case

1. Create a model with a RichEditor field storing HTML (not using ->json() mode)
2. Save some HTML content to the field
3. Edit ANY other field in the form (not the RichEditor)
4. Save the form
5. Without this fix: TypeError is thrown
6. With this fix: Form saves successfully

[maarten-mald-digital]

Looking good! Waiting for this fix

[danharrin]

Can you create a reproduction repository for this issue please? I don't understand why the state would be a string in the first place: the state cast should convert it to an array when the form is filled with the existing string, even if JSON mode is not being used.