Implement tenant announcements and audit log fixes

app/Filament/SuperAdmin/Pages/GuestPolicySettingsPage.php

@@ -164,25 +164,16 @@ class GuestPolicySettingsPage extends Page
         $settings->guest_notification_ttl_hours = $this->guest_notification_ttl_hours;
         $settings->save();
 
-        app(SuperAdminAuditLogger::class)->record(
-            'guest_policy.updated',
-            $settings,
-            SuperAdminAuditLogger::fieldsMetadata([
-                'guest_downloads_enabled',
-                'guest_sharing_enabled',
-                'guest_upload_visibility',
-                'per_device_upload_limit',
-                'join_token_failure_limit',
-                'join_token_failure_decay_minutes',
-                'join_token_access_limit',
-                'join_token_access_decay_minutes',
-                'join_token_download_limit',
-                'join_token_download_decay_minutes',
-                'share_link_ttl_hours',
-                'guest_notification_ttl_hours',
-            ]),
-            source: static::class
-        );
+        $changed = $settings->getChanges();
+
+        if ($changed !== []) {
+            app(SuperAdminAuditLogger::class)->record(
+                'guest_policy.updated',
+                $settings,
+                SuperAdminAuditLogger::fieldsMetadata(array_keys($changed)),
+                source: static::class
+            );
+        }
 
         Notification::make()
             ->title(__('admin.guest_policy.notifications.saved'))