fix: display scanner name instead of "Your Position"

Show the scanner's configured name (or hostname if not set) in map
markers and popups instead of the generic "Your Position" label.

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

src/rf_mapper/web/static/js/app.js

@@ -939,6 +939,7 @@ function updateMapMarkers() {
     const lon = parseFloat(document.getElementById('lon-input').value);
 
     // Add center marker (this scanner) - distinct star shape
+    const localScannerName = APP_CONFIG.scanner?.name || APP_CONFIG.scanner?.id || 'Scanner';
     const scannerIcon = `
         <div style="position:relative;width:24px;height:24px;">
             <svg viewBox="0 0 24 24" style="width:24px;height:24px;filter:drop-shadow(0 0 4px rgba(255,0,128,0.8));">
@@ -952,7 +953,7 @@ function updateMapMarkers() {
             iconSize: [24, 24],
             iconAnchor: [12, 12]
         })
-    }).addTo(map).bindPopup('📍 This Scanner');
+    }).addTo(map).bindPopup(`📍 ${localScannerName}`);
     markers.push(centerMarker);
 
     // Add peer scanner markers (async, won't block)
@@ -1843,10 +1844,11 @@ function update3DMarkers() {
     const groundFloor = buildingConfig.groundFloorNumber || 0;
 
     // Add scanner position marker at center (draggable for fine-grained positioning)
+    const scannerName = APP_CONFIG.scanner?.name || APP_CONFIG.scanner?.id || 'Scanner';
     const scannerEl = document.createElement('div');
     scannerEl.className = 'marker-3d center draggable';
     scannerEl.innerHTML = `<div class="marker-icon">📍</div><div class="marker-floor">F${scannerFloor}</div>`;
-    scannerEl.title = `Your Position - Floor ${scannerFloor} (drag to reposition)`;
+    scannerEl.title = `${scannerName} - Floor ${scannerFloor} (drag to reposition)`;
 
     const scannerOffset = (scannerFloor - groundFloor) * pixelsPerFloor;
     const scannerMarker = new maplibregl.Marker({
@@ -1856,7 +1858,7 @@ function update3DMarkers() {
     })
         .setLngLat([lon, lat])
         .setPopup(new maplibregl.Popup().setHTML(`
-            <strong>📍 Your Position</strong><br>
+            <strong>📍 ${escapeHtml(scannerName)}</strong><br>
             Floor: ${scannerFloor}<br>
             Lat: ${lat.toFixed(6)}<br>
             Lon: ${lon.toFixed(6)}<br>