Added Line Of Sight Feature for repeater placement, Added app wide Units Setting (#198)

* feat: add LOS workflow, global units, l10n cleanup, and mobile UI overflow fixes

Squashes prior PR commits into one changeset including: LOS map/service/tests, global metric/imperial unit system adoption, notification/BLE safety fixes, app-wide localization backfill/mojibake cleanup, and responsive UI title/overflow hardening.

* l10n: revert unrelated locale churn for LOS feature

* feat: keep LOS with app-wide unit settings

* fix: resolve post-merge app bar/import analyzer errors

* style: format screen files for CI

lib/l10n/app_localizations_nl.dart

@@ -320,6 +320,10 @@ class AppLocalizationsNl extends AppLocalizations {
   String get settings_aboutDescription =>
       'Een open-source Flutter client voor MeshCore LoRa mesh netwerkapparaten.';
 
+  @override
+  String get settings_aboutOpenMeteoAttribution =>
+      'LOS-hoogtegegevens: Open-Meteo (CC BY 4.0)';
+
   @override
   String get settings_infoName => 'Naam';
 
@@ -617,6 +621,15 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get appSettings_offlineMapCache => 'Offline Kaarten Cache';
 
+  @override
+  String get appSettings_unitsTitle => 'Eenheden';
+
+  @override
+  String get appSettings_unitsMetric => 'Metrisch (m / km)';
+
+  @override
+  String get appSettings_unitsImperial => 'Imperiaal (ft / mi)';
+
   @override
   String get appSettings_noAreaSelected => 'Geen gebied geselecteerd';
 
@@ -1235,6 +1248,12 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get map_title => 'Node Map';
 
+  @override
+  String get map_lineOfSight => 'Zichtlijn';
+
+  @override
+  String get map_losScreenTitle => 'Zichtlijn';
+
   @override
   String get map_noNodesWithLocation => 'Geen nodes met locatiegegevens';
 
@@ -2714,6 +2733,117 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get pathTrace_clearTooltip => 'Weg wissen';
 
+  @override
+  String get losSelectStartEnd =>
+      'Selecteer begin- en eindknooppunten voor LOS.';
+
+  @override
+  String losRunFailed(String error) {
+    return 'Zichtlijncontrole mislukt: $error';
+  }
+
+  @override
+  String get losClearAllPoints => 'Wis alle punten';
+
+  @override
+  String get losRunToViewElevationProfile =>
+      'Voer LOS uit om het hoogteprofiel te bekijken';
+
+  @override
+  String get losMenuTitle => 'LOS-menu';
+
+  @override
+  String get losMenuSubtitle =>
+      'Tik op knooppunten of druk lang op de kaart voor aangepaste punten';
+
+  @override
+  String get losShowDisplayNodes => 'Toon weergaveknooppunten';
+
+  @override
+  String get losCustomPoints => 'Aangepaste punten';
+
+  @override
+  String losCustomPointLabel(int index) {
+    return 'Aangepast $index';
+  }
+
+  @override
+  String get losPointA => 'Punt A';
+
+  @override
+  String get losPointB => 'Punt B';
+
+  @override
+  String losAntennaA(String value, String unit) {
+    return 'Antenne A: $value $unit';
+  }
+
+  @override
+  String losAntennaB(String value, String unit) {
+    return 'Antenne B: $value $unit';
+  }
+
+  @override
+  String get losRun => 'Voer LOS uit';
+
+  @override
+  String get losNoElevationData => 'Geen hoogtegegevens';
+
+  @override
+  String losProfileClear(
+    String distance,
+    String distanceUnit,
+    String clearance,
+    String heightUnit,
+  ) {
+    return '$distance $distanceUnit, vrije LOS, min. vrije ruimte $clearance $heightUnit';
+  }
+
+  @override
+  String losProfileBlocked(
+    String distance,
+    String distanceUnit,
+    String obstruction,
+    String heightUnit,
+  ) {
+    return '$distance $distanceUnit, geblokkeerd door $obstruction $heightUnit';
+  }
+
+  @override
+  String get losStatusChecking => 'LOS: controleren...';
+
+  @override
+  String get losStatusNoData => 'LOS: geen gegevens';
+
+  @override
+  String losStatusSummary(int clear, int total, int blocked, int unknown) {
+    return 'LOS: $clear/$total gewist, $blocked geblokkeerd, $unknown onbekend';
+  }
+
+  @override
+  String get losErrorElevationUnavailable =>
+      'Hoogtegegevens niet beschikbaar voor een of meer monsters.';
+
+  @override
+  String get losErrorInvalidInput =>
+      'Ongeldige punten/hoogtegegevens voor LOS-berekening.';
+
+  @override
+  String get losRenameCustomPoint => 'Hernoem aangepast punt';
+
+  @override
+  String get losPointName => 'Puntnaam';
+
+  @override
+  String get losShowPanelTooltip => 'Toon LOS-paneel';
+
+  @override
+  String get losHidePanelTooltip => 'LOS-paneel verbergen';
+
+  @override
+  String get losElevationAttribution =>
+      'Hoogtegegevens: Open-Meteo (CC BY 4.0)';
+
   @override
   String get contacts_pathTrace => 'Pad Traceren';