break up map_view

lib/widgets/map/direction_cones.dart

@@ -0,0 +1,76 @@
+import 'dart:math' as math;
+import 'package:flutter/material.dart';
+import 'package:flutter_map/flutter_map.dart';
+import 'package:latlong2/latlong.dart';
+
+import '../../app_state.dart';
+import '../../dev_config.dart';
+import '../../models/osm_camera_node.dart';
+
+/// Helper class to build direction cone polygons for cameras
+class DirectionConesBuilder {
+  static List<Polygon> buildDirectionCones({
+    required List<OsmCameraNode> cameras,
+    required double zoom,
+    AddCameraSession? session,
+  }) {
+    final overlays = <Polygon>[];
+    
+    // Add session cone if in add-camera mode
+    if (session != null && session.target != null) {
+      overlays.add(_buildCone(
+        session.target!, 
+        session.directionDegrees, 
+        zoom,
+      ));
+    }
+    
+    // Add cones for cameras with direction
+    overlays.addAll(
+      cameras
+        .where((n) => n.hasDirection && n.directionDeg != null)
+        .where((n) => n.coord.latitude != 0 || n.coord.longitude != 0)
+        .where((n) => n.coord.latitude.abs() <= 90 && n.coord.longitude.abs() <= 180)
+        .map((n) => _buildCone(
+          n.coord, 
+          n.directionDeg!, 
+          zoom,
+          isPending: n.tags.containsKey('_pending_upload') && 
+                     n.tags['_pending_upload'] == 'true',
+        ))
+    );
+    
+    return overlays;
+  }
+
+  static Polygon _buildCone(
+    LatLng origin, 
+    double bearingDeg, 
+    double zoom, {
+    bool isPending = false,
+  }) {
+    final halfAngle = kDirectionConeHalfAngle;
+    final length = kDirectionConeBaseLength * math.pow(2, 15 - zoom);
+
+    LatLng project(double deg) {
+      final rad = deg * math.pi / 180;
+      final dLat = length * math.cos(rad);
+      final dLon =
+          length * math.sin(rad) / math.cos(origin.latitude * math.pi / 180);
+      return LatLng(origin.latitude + dLat, origin.longitude + dLon);
+    }
+
+    final left = project(bearingDeg - halfAngle);
+    final right = project(bearingDeg + halfAngle);
+
+    // Use purple color for pending uploads
+    final color = isPending ? Colors.purple : Colors.redAccent;
+
+    return Polygon(
+      points: [origin, left, right, origin],
+      color: color.withOpacity(0.25),
+      borderColor: color,
+      borderStrokeWidth: 1,
+    );
+  }
+}