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/services/ble_debug_log_service.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/foundation.dart';
+import 'package:flutter/scheduler.dart';
 import '../connector/meshcore_protocol.dart';
 
 class BleDebugLogEntry {
@@ -44,6 +45,7 @@ class BleDebugLogService extends ChangeNotifier {
   static const int maxEntries = 500;
   final List<BleDebugLogEntry> _entries = [];
   final List<BleRawLogRxEntry> _rawLogRxEntries = [];
+  bool _notifyScheduled = false;
 
   List<BleDebugLogEntry> get entries => List.unmodifiable(_entries);
   List<BleRawLogRxEntry> get rawLogRxEntries =>
@@ -78,13 +80,31 @@ class BleDebugLogService extends ChangeNotifier {
       }
     }
 
-    notifyListeners();
+    _notifyListenersSafely();
   }
 
   void clear() {
     _entries.clear();
     _rawLogRxEntries.clear();
-    notifyListeners();
+    _notifyListenersSafely();
+  }
+
+  void _notifyListenersSafely() {
+    final phase = SchedulerBinding.instance.schedulerPhase;
+    final canNotifyNow =
+        phase == SchedulerPhase.idle ||
+        phase == SchedulerPhase.postFrameCallbacks;
+    if (canNotifyNow) {
+      notifyListeners();
+      return;
+    }
+
+    if (_notifyScheduled) return;
+    _notifyScheduled = true;
+    SchedulerBinding.instance.addPostFrameCallback((_) {
+      _notifyScheduled = false;
+      notifyListeners();
+    });
   }
 
   String _describeFrame(