Added Line Of Sight Feature for repeater placement, Added app wide Units Setting

[just-stuff-tm]

Summary

This PR adds a full Line of Sight (LOS) workflow to the map, introduces an app-wide metric/imperial unit system, fixes BLE debug build-phase notifier issues, hardens notification initialization, and improves map labeling/overflow behavior across map experiences.

It also includes LOS service tests, localization improvements.

What Changed

1. New LOS feature

Added LOS screen:

• lib/screens/line_of_sight_map_screen.dart

Added LOS computation service:

• lib/services/line_of_sight_service.dart

Added tests:

• test/services/line_of_sight_service_test.dart

LOS capabilities:

• LOS button next to Path Trace in map header.
• Select A/B from dropdown and map-node taps.
• Long press on map to add custom points.
• Rename/delete custom points.
• Toggle to hide/show display nodes.
• Clear action in header uses trash icon and clears all points/selections.
• Collapsible LOS menu.
• Graph at top of HUD; compact status text under graph.
• Antenna height controls up to 400 ft (imperial), equivalent cap in metric.
• Bottom navigation matches regular map experience.
• LOS markers preserve node-type icon/color styling.

2. Global unit system (app-wide)

Added global setting unitSystem (metric/imperial) with backward compatibility for older stored key/value reads:

• lib/models/app_settings.dart
• lib/services/app_settings_service.dart
• lib/screens/app_settings_screen.dart

Unit setting now applied in:

• LOS distances/heights.
• Path trace distance formatting:
  • lib/screens/path_trace_map.dart
  • lib/screens/map_screen.dart
  • lib/screens/channel_message_path_screen.dart
• Telemetry temperature display:
  • lib/screens/telemetry_screen.dart

3. BLE debug log runtime fix

Prevented notifyListeners() during build by deferring notification safely post-frame:

• lib/services/ble_debug_log_service.dart

Fixes runtime error:

• setState() or markNeedsBuild() called during build

4. Notification stability hardening

Added Windows initialization settings and guarded notification show paths against uninitialized plugin usage:

• lib/services/notification_service.dart

Notes:

• Uses project-generic Windows app id (no personal identifier).

5. Map label UX improvements

Added node-name label pills on:

• Main map: lib/screens/map_screen.dart
• LOS map: lib/screens/line_of_sight_map_screen.dart
• Path Trace result map: lib/screens/path_trace_map.dart
• Channel Message Path result map: lib/screens/channel_message_path_screen.dart

Behavior:

• Labels auto-fit long names.
• Labels auto-hide/show by zoom level to reduce clutter.
• Visibility threshold adjusted to remain visible farther out.

Validation Performed

• flutter analyze passed.
• flutter test passed.
• Manual checks completed for:
  • LOS flow (selection, custom points, clear/reset, HUD behavior)
  • Unit switching across relevant screens
  • Contact list tile no-overflow behavior
  • Label visibility/auto-fit behavior across map screens

Notes

• No BLE protocol command/frame format changes.
• Path tracing remains separate from LOS flow.

Checklist

• Feature implemented
• Existing behavior checked for regressions
• Tests added for LOS service
• Analyzer/test suite passing

[just-stuff-tm]

Im gonna have to resolve some issues it looks like our prs conflicted @wel97459

[just-stuff-tm]

This PR has been rebased/cleaned to align with latest upstream merges and keep only the intended LOS + app-wide units work.

What’s included:

• Kept the Line of Sight workflow and map entry flow.
• Kept app-wide unit settings (metric/imperial) and wired them through LOS/path distance displays.
• Regenerated localization outputs to keep translation files in sync.
• Resolved conflicts against upstream updates (including prior merged overlapping work) without reintroducing the adaptive app bar title behavior.

Validation:

• flutter gen-l10n
• flutter analyze --fatal-infos --fatal-warnings
• flutter test test/services/line_of_sight_service_test.dart