feat(phone-app): migrate Main destination search and navigation UI to Jetpack Compose

[hungify]

What to build

Migrate the Main destination search, route overview, turn-by-turn guidance, watch status, and navigation controls to a declarative Jetpack Compose Material 3 screen.

Acceptance criteria

• Create MainScreen.kt featuring:
  • Search bar with live autocomplete dropdown/list for PlaceSuggestion items.
  • Travel mode selector (Motorbike/Driving vs Walking).
  • Route overview card showing estimated duration, distance, and destination address.
  • Turn-by-turn steps list rendered via LazyColumn with active step highlighting and auto-scrolling.
  • Watch connection status banner with interactive retry / permission request button.
  • Navigation action button (Start / Stop Navigation) with dynamic status indicator.
  • Settings launcher icon button in the TopAppBar.
• Connect reactive UI state with MainViewModel flows using collectAsStateWithLifecycle().
• Update MainActivity to extend ComponentActivity and render MainScreen via setContent { WatchNavigatorTheme { ... } }.
• Verify location permission request, Huawei Wear Engine auth prompt, and turn streaming workflows.
• Pass all unit tests in MainViewModelTest and full build verification.

Blocked by

• feat(phone-app): setup Jetpack Compose BOM, Kotlin Compose compiler, and Material 3 theme #41