feat: add custom los icon

lib/icons/los_icon.dart

@@ -0,0 +1,26 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_svg/flutter_svg.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;
+    return SvgPicture.string(
+      _losSvg,
+      width: size,
+      height: size,
+      colorFilter: ColorFilter.mode(iconColor, BlendMode.srcIn),
+    );
+  }
+}
+
+const String _losSvg = '''
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960" fill="currentColor">
+  <path d="m82-120 258-360h202l298-348v708H82Zm70-233-64-46 172-241h202l188-219 60 52-212 247H300L152-353Zm86 153h522v-412L578-400H380L238-200Zm522 0Z"/>
+</svg>
+''';

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 &&