fix: capture map image immediately on "Définir le cadrage" click

Save map data directly via API instead of emit('input') to avoid
draft state. Capture image, clear flag, then reload — the panel
shows the correct image in a single reload.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

public/site/plugins/map-editor/routes/mapdata/save.php

@@ -0,0 +1,69 @@
+<?php
+
+/**
+ * PATCH save map data (center, zoom) directly to the page content
+ */
+
+return [
+    'pattern' => 'map-editor/pages/(:all)/mapdata',
+    'method' => 'PATCH',
+    'auth' => false,
+    'action' => function (string $pageId) {
+        try {
+            $user = kirby()->user();
+
+            if (!$user && !kirby()->option('debug', false)) {
+                return [
+                    'status' => 'error',
+                    'message' => 'Unauthorized',
+                    'code' => 401
+                ];
+            }
+
+            $page = kirby()->page($pageId);
+            if (!$page) {
+                return [
+                    'status' => 'error',
+                    'message' => 'Page not found',
+                    'code' => 404
+                ];
+            }
+
+            if (!$page->permissions()->can('update')) {
+                return [
+                    'status' => 'error',
+                    'message' => 'Forbidden',
+                    'code' => 403
+                ];
+            }
+
+            $data = kirby()->request()->data();
+
+            if (!isset($data['mapdata'])) {
+                return [
+                    'status' => 'error',
+                    'message' => 'mapdata is required',
+                    'code' => 400
+                ];
+            }
+
+            $page->update([
+                'mapdata' => $data['mapdata']
+            ]);
+
+            return [
+                'status' => 'success',
+                'data' => [
+                    'message' => 'Map data saved successfully'
+                ]
+            ];
+
+        } catch (Exception $e) {
+            return [
+                'status' => 'error',
+                'message' => $e->getMessage(),
+                'code' => 500
+            ];
+        }
+    }
+];