Implement immediate particle reload on pan/zoom release

⚡ INSTANT PARTICLE RELOAD SYSTEM:
- Particles hold in place during pan/zoom/drag operations
- Immediate removal of old particles on mouse release
- Instant creation of new particles at full density
- No delays or gradual transitions - maximum responsiveness

🖱️ EVENT HANDLING:
- moveend: Immediate reload when panning stops
- zoomend: Immediate reload when zooming stops
- dragend: Immediate reload when dragging stops

🔍 DEBUG LOGGING:
- Clear console feedback for each reload step
- Shows removal and creation of particles in real-time

This provides the snappy, responsive particle behavior requested -
particles freeze during interaction and reload instantly on release!

app.py

@@ -638,6 +638,35 @@ def create_wind_map(region="global"):
                 console.log("⚡ Particle colors updated for theme!");
             }}
             
+            // Immediate particle reload function for pan/zoom events
+            function immediateParticleReload() {{
+                console.log("⚡ PAN/ZOOM END: Immediate particle reload...");
+                
+                // Remove old particles immediately
+                if (show10m && current10mLayer) {{
+                    console.log("⚡ Removing old 10m particles immediately...");
+                    map.removeLayer(current10mLayer);
+                    console.log("⚡ Creating new 10m particles at full density...");
+                    current10mLayer = create10mLayer();
+                    current10mLayer.addTo(map);
+                }}
+                
+                if (show100m && current100mLayer) {{
+                    console.log("⚡ Removing old 100m particles immediately...");
+                    map.removeLayer(current100mLayer);
+                    console.log("⚡ Creating new 100m particles at full density...");
+                    current100mLayer = create100mLayer();
+                    current100mLayer.addTo(map);
+                }}
+                
+                console.log("⚡ New particles loaded immediately - complete!");
+            }}
+            
+            // Event handlers for map interaction - immediate reload on mouse release
+            map.on('moveend', immediateParticleReload);   // Pan end
+            map.on('zoomend', immediateParticleReload);   // Zoom end
+            map.on('dragend', immediateParticleReload);   // Drag end
+            
             // Event handler for theme changes
             map.on('baselayerchange', function() {{
                 setTimeout(reloadParticlesWithTheme, 100); // Small delay to ensure theme change is complete