fix: global library edits check private and scheduled pages, name the backup on failure (P8a, P14)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/Integrations/Divi/Pages/DiviWriter.php

@@ -179,7 +179,43 @@ final class DiviWriter
             return $prepared;
         }
 
-        return array_merge($this->save($ability, $page, $change, $input, $prepared['scope']), $prepared['details']);
+        try {
+            $saved = $this->save($ability, $page, $change, $input, $prepared['scope']);
+        } catch (WriteFailed $e) {
+            throw self::keepingBackup($e, $prepared['details']['backup_id'] ?? null);
+        }
+
+        return array_merge($saved, $prepared['details']);
+    }
+
+    /**
+     * Ruling P14: GlobalEdits made a backup (revisions off) before the save failed – the error names
+     * it, because it stays in the trash and is the only earlier state.
+     */
+    private static function keepingBackup(WriteFailed $e, mixed $backupId): WriteFailed
+    {
+        if (! is_int($backupId)) {
+            return $e;
+        }
+
+        $kept = sprintf(
+            'Sicherung %d liegt im Papierkorb (vorheriger Stand des Bibliothekseintrags, in WordPress '
+                . 'wiederherstellbar).',
+            $backupId
+        );
+        if ($e->rolledBack) {
+            return $e->withDetails(
+                ['backup_id' => $backupId],
+                $kept . ' Den Aufruf erst nach Prüfung mit lit-divi-outline wiederholen.',
+                Errors::notSavedKeeping(sprintf('Sicherung %d im Papierkorb', $backupId))
+            );
+        }
+
+        return $e->withDetails(
+            ['backup_id' => $backupId],
+            'Den Aufruf nicht einfach wiederholen. ' . $kept . ' Zuerst den Stand mit lit-divi-outline prüfen und '
+                . 'dem Nutzer Bescheid geben.'
+        );
     }
 
     /** A tool's confirm_required on a global library entry, extended by the affected pages. */