fix: implement form-based coordinate sync for single mode map

Fixed marker display and centering in single mode (marker pages) by
changing from props-based to form-based coordinate synchronization.

Issues Fixed:
- Kirby blueprint query syntax {{ page.field }} passed literal strings
  instead of values to component props
- Invalid coordinates (NaN, NaN) caused map initialization errors
- Marker not displaying in marker page position tab
- Map not centering on marker location

Solution:
- Remove latitude/longitude props from marker.yml blueprint
- Read coordinates directly from Panel form fields via DOM
- Add event listeners to sync form changes with map
- Bidirectional sync: drag marker → updates form fields
- Robust coordinate validation (check for NaN, null, 0)

Changes:
- MapEditor.vue: Add form field reading and event listeners
- MapEditor.vue: Replace props-based coords with reactive refs
- MapEditor.vue: Update marker drag handler to modify form inputs
- marker.yml: Remove non-functional query string props
- routes.php: Use data() instead of body() for all routes

Single Mode Flow:
1. Component reads latitude/longitude from form inputs on mount
2. Creates marker and centers map on valid coordinates
3. Form changes → updates marker position
4. Marker drag → updates form fields (triggers save on user action)

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

public/site/blueprints/pages/marker.yml

@@ -58,6 +58,4 @@ tabs:
                 label: Position sur la carte
                 type: map-editor
                 mode: single
-                latitude: "{{ page.latitude }}"
-                longitude: "{{ page.longitude }}"
                 help: Déplacez le marqueur ou recherchez une adresse

public/site/plugins/map-editor/src/components/field/MapEditor.vue

@@ -128,14 +128,15 @@ export default {
     // Computed: markers based on mode
     const markers = computed(() => {
       if (props.mode === 'single') {
-        // Single mode: create one marker from props
-        if (props.latitude !== null && props.longitude !== null) {
+        // Single mode: create one marker from form values
+        const lat = singleLat.value;
+        const lon = singleLon.value;
+
+        // Only create marker if we have valid coordinates
+        if (!isNaN(lat) && !isNaN(lon) && lat !== null && lon !== null && lat !== 0 && lon !== 0) {
           return [{
             id: 'single-marker',
-            position: {
-              lat: parseFloat(props.latitude),
-              lon: parseFloat(props.longitude),
-            },
+            position: { lat, lon },
             title: 'Current position',
           }];
         }
@@ -149,6 +150,25 @@ export default {
       return markers.value.length < props.maxMarkers;
     });
 
+    // Single mode: reactive references for coordinates from form fields
+    const singleLat = ref(null);
+    const singleLon = ref(null);
+
+    // Function to get coordinates from Panel form fields (single mode)
+    function getCoordinatesFromForm() {
+      // Find the latitude and longitude input fields in the same form
+      const form = document.querySelector('.k-form');
+      if (!form) return { lat: null, lon: null };
+
+      const latInput = form.querySelector('input[name*="latitude"]');
+      const lonInput = form.querySelector('input[name*="longitude"]');
+
+      return {
+        lat: latInput ? parseFloat(latInput.value) : null,
+        lon: lonInput ? parseFloat(lonInput.value) : null
+      };
+    }
+
     // Load data on mount
     onMounted(async () => {
       if (props.mode === 'multi') {
@@ -159,12 +179,25 @@ export default {
           console.error('Failed to load markers:', error);
         }
       } else if (props.mode === 'single') {
-        // Single mode: center on marker position
-        if (props.latitude !== null && props.longitude !== null) {
-          center.value = {
-            lat: parseFloat(props.latitude),
-            lon: parseFloat(props.longitude),
-          };
+        // Single mode: get coordinates from form
+        const coords = getCoordinatesFromForm();
+        singleLat.value = coords.lat;
+        singleLon.value = coords.lon;
+
+        if (!isNaN(coords.lat) && !isNaN(coords.lon) && coords.lat !== 0 && coords.lon !== 0) {
+          center.value = { lat: coords.lat, lon: coords.lon };
+        }
+
+        // Watch for changes in the form fields
+        const form = document.querySelector('.k-form');
+        if (form) {
+          form.addEventListener('input', (e) => {
+            if (e.target.name && (e.target.name.includes('latitude') || e.target.name.includes('longitude'))) {
+              const newCoords = getCoordinatesFromForm();
+              singleLat.value = newCoords.lat;
+              singleLon.value = newCoords.lon;
+            }
+          });
         }
       }
 
@@ -188,14 +221,16 @@ export default {
       { deep: true }
     );
 
-    // Watch latitude/longitude props in single mode
+    // Watch form coordinates in single mode
     watch(
-      () => [props.latitude, props.longitude],
-      ([newLat, newLon]) => {
-        if (props.mode === 'single' && newLat !== null && newLon !== null) {
-          // Center map on new position
-          if (mapPreview.value && mapPreview.value.centerOnPosition) {
-            mapPreview.value.centerOnPosition(parseFloat(newLat), parseFloat(newLon));
+      () => [singleLat.value, singleLon.value],
+      ([lat, lon]) => {
+        if (props.mode === 'single') {
+          // Center map on new position if valid
+          if (!isNaN(lat) && !isNaN(lon) && lat !== null && lon !== null && lat !== 0 && lon !== 0) {
+            if (mapPreview.value && mapPreview.value.centerOnPosition) {
+              mapPreview.value.centerOnPosition(lat, lon);
+            }
           }
         }
       }
@@ -267,34 +302,23 @@ export default {
      */
     async function handleMarkerMoved({ markerId, position }) {
       if (props.mode === 'single') {
-        // Single mode: update current page's coordinates via API
-        // Extract current page ID from window location
-        const match = window.location.pathname.match(/\/panel\/pages\/(.+)/);
-        if (match) {
-          const currentPageId = match[1];
-          try {
-            const csrfToken = document.querySelector('meta[name="csrf"]')?.content || '';
-            const response = await fetch(`/api/map-editor/pages/${currentPageId}/position`, {
-              method: 'PATCH',
-              headers: {
-                'Content-Type': 'application/json',
-                'X-CSRF': csrfToken
-              },
-              body: JSON.stringify({
-                latitude: position.lat,
-                longitude: position.lng
-              })
-            });
+        // Single mode: update form fields directly
+        const form = document.querySelector('.k-form');
+        if (form) {
+          const latInput = form.querySelector('input[name*="latitude"]');
+          const lonInput = form.querySelector('input[name*="longitude"]');
 
-            if (!response.ok) {
-              throw new Error('Failed to update position');
-            }
+          if (latInput && lonInput) {
+            latInput.value = position.lat;
+            lonInput.value = position.lng;
 
-            // Reload the panel form to reflect updated values
-            // This is a simple approach - Panel will refresh the form data
-            console.log('Position updated successfully');
-          } catch (error) {
-            console.error('Failed to update position:', error);
+            // Trigger input event to update Vue/Kirby state
+            latInput.dispatchEvent(new Event('input', { bubbles: true }));
+            lonInput.dispatchEvent(new Event('input', { bubbles: true }));
+
+            // Update local refs
+            singleLat.value = position.lat;
+            singleLon.value = position.lng;
           }
         }
       } else {