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Giving a record a future date was recorded as "unpublished", and announced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/Models/Concerns/HasRevisions.php

@@ -131,11 +131,23 @@ trait HasRevisions
 
         // Ask the model itself: "published" means different things to a page
         // with a status and a project with only a date.
-        if (method_exists($this, 'isPublishedNow')) {
-            return $this->isPublishedNow() ? 'published' : 'unpublished';
+        if (! method_exists($this, 'isPublishedNow')) {
+            return 'updated';
         }
 
-        return 'updated';
+        // Before and after, because the change is what has a name: going live,
+        // coming off, or being given a date — which is neither, and which a
+        // history that only asked "is it live now?" called "unpublished".
+        $before = (clone $this)->setRawAttributes($this->getRawOriginal());
+        $now = $this->isPublishedNow();
+        $was = $before->isPublishedNow();
+
+        return match (true) {
+            $now && ! $was => 'published',
+            ! $now && $was => 'unpublished',
+            ! $now && method_exists($this, 'isScheduled') && $this->isScheduled() => 'scheduled',
+            default => 'updated',
+        };
     }
 
     protected function revisionValue(mixed $value): mixed