fix: marker title displayed immediately on creation

- Return title directly instead of reading from page object
- Prevents showing identifier/slug before reload
- New markers now display "Marqueur [index]" immediately in list
- Also return num directly for consistency

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

public/site/plugins/map-editor/api/routes.php

@@ -155,15 +155,16 @@ return [
                     ->filterBy('intendedTemplate', 'marker');
                 $nextNum = $existingMarkers->count() + 1;
 
-                // Generate unique slug
+                // Generate unique slug and title
                 $slug = 'marker-' . time();
+                $title = 'Marqueur ' . $nextNum;
 
                 // Create the new marker page
                 $newMarker = $mapPage->createChild([
                     'slug' => $slug,
                     'template' => 'marker',
                     'content' => [
-                        'title' => 'Marqueur ' . $nextNum,
+                        'title' => $title,
                         'latitude' => $lat,
                         'longitude' => $lon
                     ]
@@ -178,13 +179,13 @@ return [
                         'marker' => [
                             'id' => $newMarker->id(),
                             'slug' => $newMarker->slug(),
-                            'title' => $newMarker->title()->value(),
+                            'title' => $title,
                             'position' => [
                                 'lat' => $lat,
                                 'lon' => $lon
                             ],
-                            'num' => $newMarker->num(),
-                            'panelUrl' => '/panel/pages/' . $newMarker->id()
+                            'num' => $nextNum,
+                            'panelUrl' => (string) $newMarker->panel()->url()
                         ]
                     ]
                 ];