Tell scheduling apart from unpublishing in the history

Giving a record a future date was recorded as "unpublished", and announced
to webhooks as such. The history now compares before and after.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/Filament/RelationManagers/RevisionsRelationManager.php

@@ -51,6 +51,7 @@ class RevisionsRelationManager extends RelationManager
                     ->color(fn (string $state) => match ($state) {
                         'published' => 'success',
                         'unpublished' => 'warning',
+                        'scheduled' => 'info',
                         'created' => 'info',
                         'deleted', 'erased' => 'danger',
                         default => 'gray',
@@ -77,7 +78,7 @@ class RevisionsRelationManager extends RelationManager
             ->filters([
                 SelectFilter::make('event')
                     ->label(__('panel.revisions.fields.event'))
-                    ->options(fn () => collect(['created', 'updated', 'published', 'unpublished', 'deleted', 'restored', 'erased'])
+                    ->options(fn () => collect(['created', 'updated', 'published', 'scheduled', 'unpublished', 'deleted', 'restored', 'erased'])
                         ->mapWithKeys(fn (string $e) => [$e => __("panel.revisions.events.{$e}")])
                         ->all()),
             ])