Add path tracing functionality (#165)

- Implemented path tracing feature in the map screen, allowing users to add nodes to a path and visualize it on the map.
- Added buttons for starting path tracing, removing the last node, and running the path trace.
- Introduced a new overlay to display current path information and distance.
- Updated localization files for multiple languages to include new strings related to path tracing.
- Refactored map rendering logic to accommodate path tracing visuals.

lib/l10n/app_localizations_de.dart

@@ -1362,6 +1362,19 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get map_manageRepeater => 'Repeater verwalten';
 
+  @override
+  String get map_tapToAdd =>
+      'Tippen Sie auf Knoten, um sie zum Pfad hinzuzufügen.';
+
+  @override
+  String get map_runTrace => 'Pfadverlauf ausführen';
+
+  @override
+  String get map_removeLast => 'Letztes Entfernen';
+
+  @override
+  String get map_pathTraceCancelled => 'Pfadverfolgung abgebrochen.';
+
   @override
   String get mapCache_title => 'Offline-Karten-Cache';
 
@@ -2704,6 +2717,9 @@ class AppLocalizationsDe extends AppLocalizations {
   String get pathTrace_someHopsNoLocation =>
       'Bei einer oder mehreren Knoten fehlt der Standort!';
 
+  @override
+  String get pathTrace_clearTooltip => 'Pfad löschen';
+
   @override
   String get contacts_pathTrace => 'Pfadverfolgung';