GEOINT Flugverkehr: Kein Flackern, stabiler

- Atomarer Layer-Swap statt clearLayers (Marker verschwinden nie)
- Einzelner API-Call (radius=250nm) statt 4 Grid-Calls (weniger Rate-Limits)
- Refresh-Interval 15s -> 30s (weniger API-Last)
- moveend-Debounce 1.2s -> 2s (ruhigeres Verhalten beim Navigieren)
- Backend Cache-TTL 10s -> 20s, Koordinaten auf 0.5-Grad-Raster gerundet

src/static/js/geoint.js

@@ -189,11 +189,11 @@ const GEOINT = {
         this._flightLayer = L.layerGroup().addTo(map);
         var self = this;
         this._fetchFlights(map);
-        this._flightInterval = setInterval(function() { self._fetchFlights(map); }, 15000);
+        this._flightInterval = setInterval(function() { self._fetchFlights(map); }, 30000);
         // Bei Kartenbewegung neu laden
         this._moveHandler = function() {
             clearTimeout(self._moveDebounce);
-            self._moveDebounce = setTimeout(function() { self._fetchFlights(map); }, 1200);
+            self._moveDebounce = setTimeout(function() { self._fetchFlights(map); }, 2000);
         };
         map.on('moveend', this._moveHandler);
     },
@@ -207,32 +207,19 @@ const GEOINT = {
     _fetchFlights(map) {
         if (this._flightFetching || !map || map.getZoom() < 3) return;
         this._flightFetching = true;
-        var bounds = map.getBounds();
+        var center = map.getCenter();
         var self = this;
         var token = localStorage.getItem('osint_token') || '';
         var headers = token ? { 'Authorization': 'Bearer ' + token } : {};
 
-        // Grid-Punkte berechnen fuer vollstaendige Abdeckung
-        var points = this._calcGridPoints(bounds);
-
-        Promise.all(points.map(function(p) {
-            return fetch('/api/geoint/flights?lat=' + p.lat.toFixed(4) + '&lon=' + p.lon.toFixed(4) + '&radius=' + p.radius, { headers: headers })
-                .then(function(r) { return r.ok ? r.json() : { ac: [] }; })
-                .catch(function() { return { ac: [] }; });
-        }))
-        .then(function(results) {
+        fetch('/api/geoint/flights?lat=' + center.lat.toFixed(2) + '&lon=' + center.lng.toFixed(2) + '&radius=250', { headers: headers })
+        .then(function(r) { return r.ok ? r.json() : { ac: [] }; })
+        .then(function(data) {
             if (!self._flightLayer) return;
-            self._flightLayer.clearLayers();
-            // Alle Ergebnisse zusammenfuehren, Duplikate per hex entfernen
-            var seen = {};
-            var allAc = [];
-            results.forEach(function(data) {
-                (data.ac || data.aircraft || []).forEach(function(a) {
-                    var key = a.hex || (a.lat + ',' + a.lon);
-                    if (!seen[key]) { seen[key] = true; allAc.push(a); }
-                });
-            });
-            allAc.slice(0, 500).forEach(function(a) {
+            // Neue Marker in temporaerem Layer bauen, dann atomar swappen
+            var newLayer = L.layerGroup();
+            var ac = data.ac || data.aircraft || [];
+            ac.slice(0, 500).forEach(function(a) {
                 if (!a.lat || !a.lon) return;
                 var heading = a.track || a.true_heading || 0;
                 var icon = L.divIcon({
@@ -255,8 +242,13 @@ const GEOINT = {
                     '<br><span class="geoint-popup-key">SPD</span> ' + (typeof spd === 'number' ? Math.round(spd) + ' kts' : spd) +
                     '<br><span class="geoint-popup-key">HDG</span> ' + Math.round(heading) + '°' +
                     '</div>';
-                L.marker([a.lat, a.lon], { icon: icon }).bindPopup(popup, { className: 'geoint-leaflet-popup' }).addTo(self._flightLayer);
+                L.marker([a.lat, a.lon], { icon: icon }).bindPopup(popup, { className: 'geoint-leaflet-popup' }).addTo(newLayer);
             });
+            // Atomar swappen: alte Marker entfernen, neue hinzufuegen
+            if (self._map && self._flightLayer) {
+                self._map.removeLayer(self._flightLayer);
+                self._flightLayer = newLayer.addTo(self._map);
+            }
         })
         .catch(function(e) { if (typeof DEV_MODE !== 'undefined' && DEV_MODE) console.warn('GEOINT flights:', e); })
         .finally(function() { self._flightFetching = false; });