feat: show los elevation icon

lib/icons/los_icon.dart

@@ -0,0 +1,80 @@
+import 'dart:math' as math;
+
+import 'package:flutter/material.dart';
+
+class LosIcon extends StatelessWidget {
+  final double size;
+  final Color? color;
+
+  const LosIcon({
+    super.key,
+    this.size = 24,
+    this.color,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final iconColor = color ?? IconTheme.of(context).color ?? Colors.black;
+    final canvasSize = size;
+
+    return SizedBox(
+      width: canvasSize,
+      height: canvasSize,
+      child: CustomPaint(
+        painter: _LosIconPainter(iconColor),
+      ),
+    );
+  }
+}
+
+class _LosIconPainter extends CustomPainter {
+  final Color color;
+
+  _LosIconPainter(this.color);
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    final paint = Paint()
+      ..color = color
+      ..style = PaintingStyle.fill;
+
+    final path = Path()
+      ..moveTo(82, -120)
+      ..relativeLineTo(258, -360)
+      ..relativeLineTo(202, 0)
+      ..relativeLineTo(298, -348)
+      ..relativeLineTo(0, 708)
+      ..lineTo(82, -120)
+      ..close()
+      ..moveTo(152, -353)
+      ..relativeLineTo(-64, -46)
+      ..relativeLineTo(172, -241)
+      ..relativeLineTo(202, 0)
+      ..relativeLineTo(188, -219)
+      ..relativeLineTo(60, 52)
+      ..relativeLineTo(-212, 247)
+      ..lineTo(300, -560)
+      ..lineTo(152, -353)
+      ..close()
+      ..moveTo(238, -200)
+      ..relativeLineTo(522, 0)
+      ..relativeLineTo(0, -412)
+      ..lineTo(578, -400)
+      ..lineTo(380, -400)
+      ..lineTo(238, -200)
+      ..close();
+
+    final scale = math.min(size.width, size.height) / 960;
+
+    canvas.save();
+    canvas.translate(0, 960);
+    canvas.scale(scale, scale);
+    canvas.drawPath(path, paint);
+    canvas.restore();
+  }
+
+  @override
+  bool shouldRepaint(covariant _LosIconPainter oldDelegate) {
+    return oldDelegate.color != color;
+  }
+}

lib/screens/line_of_sight_map_screen.dart

@@ -16,6 +16,7 @@ import '../services/map_tile_cache_service.dart';
 import '../utils/route_transitions.dart';
 import '../widgets/app_bar.dart';
 import '../widgets/quick_switch_bar.dart';
+import '../icons/los_icon.dart';
 
 class LineOfSightEndpoint {
   final String label;
@@ -642,7 +643,7 @@ class _LineOfSightMapScreenState extends State<LineOfSightMapScreen> {
                     alignment: Alignment.centerRight,
                     child: ElevatedButton.icon(
                       onPressed: _loading ? null : _runLos,
-                      icon: const Icon(Icons.visibility),
+                      icon: const LosIcon(),
                       label: Text(context.l10n.losRun),
                     ),
                   ),

lib/screens/map_screen.dart

@@ -20,6 +20,7 @@ import '../services/map_tile_cache_service.dart';
 import '../utils/contact_search.dart';
 import '../utils/route_transitions.dart';
 import '../widgets/quick_switch_bar.dart';
+import '../icons/los_icon.dart';
 import 'channels_screen.dart';
 import 'chat_screen.dart';
 import 'contacts_screen.dart';
@@ -280,7 +281,7 @@ class _MapScreenState extends State<MapScreen> {
                   ),
                 if (!_isBuildingPathTrace)
                   IconButton(
-                    icon: const Icon(Icons.visibility),
+                    icon: const LosIcon(),
                     onPressed: () {
                       final candidates = <LineOfSightEndpoint>[];
                       if (connector.selfLatitude != null &&