Extract aircraft SVG icons to external files and add dynamic marker updates

- Extract all aircraft type SVG designs to separate files in /static/icons/
- Add icon caching system with async loading and fallback mechanisms
- Implement dynamic marker icon updates when aircraft properties change
- Detect and respond to aircraft type/category, ground status, and rotation changes
- Use currentColor in SVG files for dynamic color application
- Maintain performance with intelligent change detection (5° rotation threshold)
- Support real-time marker updates for weight class transitions and ADS-B changes

🤖 Generated with [Claude Code](https://claude.ai/code)

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

assets/static/icons/cargo.svg

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+  <g transform="translate(16,16)">
+    <!-- Wide-body cargo aircraft shape -->
+    <path d="M0,-12 L-10,8 L-3,8 L0,12 L3,8 L10,8 Z" fill="currentColor"/>
+    <!-- Fuselage bulk -->
+    <rect x="-2" y="-6" width="4" height="8" fill="currentColor"/>
+  </g>
+</svg>

assets/static/icons/commercial.svg

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+  <g transform="translate(16,16)">
+    <!-- Standard commercial aircraft shape -->
+    <path d="M0,-12 L-8,8 L-2,8 L0,12 L2,8 L8,8 Z" fill="currentColor"/>
+  </g>
+</svg>

assets/static/icons/ga.svg

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+  <g transform="translate(16,16)">
+    <!-- Small general aviation aircraft -->
+    <path d="M0,-10 L-5,6 L-1,6 L0,10 L1,6 L5,6 Z" fill="currentColor"/>
+  </g>
+</svg>

assets/static/icons/ground.svg

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+  <g transform="translate(16,16)">
+    <!-- Ground vehicle - truck/car shape -->
+    <rect x="-6" y="-4" width="12" height="8" fill="currentColor" rx="2"/>
+    <!-- Wheels -->
+    <circle cx="-3" cy="2" r="2" fill="#333"/>
+    <circle cx="3" cy="2" r="2" fill="#333"/>
+  </g>
+</svg>

assets/static/icons/helicopter.svg

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+  <g transform="translate(16,16)">
+    <!-- Rotor disc -->
+    <circle cx="0" cy="0" r="10" fill="none" stroke="currentColor" stroke-width="1" opacity="0.3"/>
+    <!-- Main body -->
+    <path d="M0,-8 L-6,6 L-1,6 L0,8 L1,6 L6,6 Z" fill="currentColor"/>
+    <!-- Rotor mast -->
+    <path d="M0,-6 L0,-10" stroke="currentColor" stroke-width="2"/>
+    <path d="M0,6 L0,8" stroke="currentColor" stroke-width="2"/>
+  </g>
+</svg>

assets/static/icons/military.svg

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+  <g transform="translate(16,16)">
+    <!-- Swept-wing fighter jet shape -->
+    <path d="M0,-12 L-4,2 L-8,8 L-2,6 L0,12 L2,6 L8,8 L4,2 Z" fill="currentColor"/>
+  </g>
+</svg>

assets/static/js/modules/aircraft-manager.js

@@ -12,9 +12,67 @@ export class AircraftManager {
         this.markerUpdateCount = 0;
         this.markerRemoveCount = 0;
         
+        // SVG icon cache
+        this.iconCache = new Map();
+        this.loadIcons();
+        
         // Map event listeners removed - let Leaflet handle positioning naturally
     }
 
+    async loadIcons() {
+        const iconTypes = ['commercial', 'helicopter', 'military', 'cargo', 'ga', 'ground'];
+        
+        for (const type of iconTypes) {
+            try {
+                const response = await fetch(`/static/icons/${type}.svg`);
+                const svgText = await response.text();
+                this.iconCache.set(type, svgText);
+            } catch (error) {
+                console.warn(`Failed to load icon for ${type}:`, error);
+                // Fallback to inline SVG if needed
+                this.iconCache.set(type, this.createFallbackIcon(type));
+            }
+        }
+    }
+
+    createFallbackIcon(type) {
+        // Fallback inline SVG if file loading fails
+        const color = 'currentColor';
+        let path = '';
+        
+        switch (type) {
+            case 'helicopter':
+                path = `<circle cx="0" cy="0" r="10" fill="none" stroke="${color}" stroke-width="1" opacity="0.3"/>
+                       <path d="M0,-8 L-6,6 L-1,6 L0,8 L1,6 L6,6 Z" fill="${color}"/>
+                       <path d="M0,-6 L0,-10" stroke="${color}" stroke-width="2"/>
+                       <path d="M0,6 L0,8" stroke="${color}" stroke-width="2"/>`;
+                break;
+            case 'military':
+                path = `<path d="M0,-12 L-4,2 L-8,8 L-2,6 L0,12 L2,6 L8,8 L4,2 Z" fill="${color}"/>`;
+                break;
+            case 'cargo':
+                path = `<path d="M0,-12 L-10,8 L-3,8 L0,12 L3,8 L10,8 Z" fill="${color}"/>
+                       <rect x="-2" y="-6" width="4" height="8" fill="${color}"/>`;
+                break;
+            case 'ga':
+                path = `<path d="M0,-10 L-5,6 L-1,6 L0,10 L1,6 L5,6 Z" fill="${color}"/>`;
+                break;
+            case 'ground':
+                path = `<rect x="-6" y="-4" width="12" height="8" fill="${color}" rx="2"/>
+                       <circle cx="-3" cy="2" r="2" fill="#333"/>
+                       <circle cx="3" cy="2" r="2" fill="#333"/>`;
+                break;
+            default:
+                path = `<path d="M0,-12 L-8,8 L-2,8 L0,12 L2,8 L8,8 Z" fill="${color}"/>`;
+        }
+        
+        return `<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+  <g transform="translate(16,16)">
+    ${path}
+  </g>
+</svg>`;
+    }
 
     updateAircraftData(data) {
         if (data.aircraft) {
@@ -74,13 +132,21 @@ export class AircraftManager {
             const oldPos = marker.getLatLng();
             marker.setLatLng(pos);
             
-            // Update icon if track has changed to apply new rotation
-            if (aircraft.Track !== undefined) {
-                const currentRotation = marker._currentRotation || 0;
-                if (Math.abs(currentRotation - aircraft.Track) > 5) { // Update if rotation changed by more than 5 degrees
-                    marker.setIcon(this.createAircraftIcon(aircraft));
-                    marker._currentRotation = aircraft.Track;
-                }
+            // Check if icon needs to be updated (track rotation, aircraft type, or ground status changes)
+            const currentRotation = marker._currentRotation || 0;
+            const currentType = marker._currentType || null;
+            const currentOnGround = marker._currentOnGround || false;
+            
+            const newType = this.getAircraftIconType(aircraft);
+            const rotationChanged = aircraft.Track !== undefined && Math.abs(currentRotation - aircraft.Track) > 5;
+            const typeChanged = currentType !== newType;
+            const groundStatusChanged = currentOnGround !== aircraft.OnGround;
+            
+            if (rotationChanged || typeChanged || groundStatusChanged) {
+                marker.setIcon(this.createAircraftIcon(aircraft));
+                marker._currentRotation = aircraft.Track || 0;
+                marker._currentType = newType;
+                marker._currentOnGround = aircraft.OnGround || false;
             }
             
             // Handle popup exactly like Leaflet expects
@@ -99,8 +165,10 @@ export class AircraftManager {
                     icon: icon
                 }).addTo(this.map);
                 
-                // Store current rotation for future updates
+                // Store current properties for future update comparisons
                 marker._currentRotation = aircraft.Track || 0;
+                marker._currentType = this.getAircraftIconType(aircraft);
+                marker._currentOnGround = aircraft.OnGround || false;
                 
                 marker.bindPopup(this.createPopupContent(aircraft), {
                     maxWidth: 450,
@@ -133,60 +201,28 @@ export class AircraftManager {
         const size = aircraft.OnGround ? 12 : 16;
         const rotation = aircraft.Track || 0;
         
-        // Create different SVG shapes based on aircraft type
-        let aircraftPath;
+        // Get SVG template from cache
+        let svgTemplate = this.iconCache.get(iconType) || this.iconCache.get('commercial');
         
-        switch (iconType) {
-            case 'helicopter':
-                // Helicopter shape with rotor disc
-                aircraftPath = `
-                    <circle cx="0" cy="0" r="10" fill="none" stroke="${color}" stroke-width="1" opacity="0.3"/>
-                    <path d="M0,-8 L-6,6 L-1,6 L0,8 L1,6 L6,6 Z" fill="${color}"/>
-                    <path d="M0,-6 L0,-10" stroke="${color}" stroke-width="2"/>
-                    <path d="M0,6 L0,8" stroke="${color}" stroke-width="2"/>
-                `;
-                break;
-            case 'military':
-                // Swept-wing fighter jet shape
-                aircraftPath = `
-                    <path d="M0,-12 L-4,2 L-8,8 L-2,6 L0,12 L2,6 L8,8 L4,2 Z" fill="${color}"/>
-                `;
-                break;
-            case 'cargo':
-                // Wide-body cargo aircraft shape
-                aircraftPath = `
-                    <path d="M0,-12 L-10,8 L-3,8 L0,12 L3,8 L10,8 Z" fill="${color}"/>
-                    <rect x="-2" y="-6" width="4" height="8" fill="${color}"/>
-                `;
-                break;
-            case 'ga':
-                // Small general aviation aircraft
-                aircraftPath = `
-                    <path d="M0,-10 L-5,6 L-1,6 L0,10 L1,6 L5,6 Z" fill="${color}"/>
-                `;
-                break;
-            case 'ground':
-                // Ground vehicle - simplified truck/car shape
-                aircraftPath = `
-                    <rect x="-6" y="-4" width="12" height="8" fill="${color}" rx="2"/>
-                    <circle cx="-3" cy="2" r="2" fill="#333"/>
-                    <circle cx="3" cy="2" r="2" fill="#333"/>
-                `;
-                break;
-            default:
-                // Default commercial aircraft shape
-                aircraftPath = `
-                    <path d="M0,-12 L-8,8 L-2,8 L0,12 L2,8 L8,8 Z" fill="${color}"/>
-                `;
+        if (!svgTemplate) {
+            // Ultimate fallback - create a simple circle
+            svgTemplate = `<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+                <g transform="translate(16,16)">
+                    <circle cx="0" cy="0" r="8" fill="currentColor"/>
+                </g>
+            </svg>`;
         }
         
-        const svg = `
-            <svg width="${size * 2}" height="${size * 2}" viewBox="0 0 32 32">
-                <g transform="translate(16,16) rotate(${rotation})">
-                    ${aircraftPath}
-                </g>
-            </svg>
-        `;
+        // Apply color and rotation to the SVG
+        let svg = svgTemplate
+            .replace(/currentColor/g, color)
+            .replace(/width="32"/, `width="${size * 2}"`)
+            .replace(/height="32"/, `height="${size * 2}"`);
+        
+        // Add rotation to the transform
+        if (rotation !== 0) {
+            svg = svg.replace(/transform="translate\(16,16\)"/, `transform="translate(16,16) rotate(${rotation})"`);
+        }
         
         return L.divIcon({
             html: svg,