feat(phone-app): migrate Settings screen to Jetpack Compose Material 3 (#42)

[hungify]

Summary

Migrates the phone app's Settings screen from legacy XML views and ViewBinding to a declarative Jetpack Compose Material 3 UI with reactive state handling.

Key Changes

• SettingsScreen.kt:
  • Implements modern Material 3 Scaffold, TopAppBar, and back navigation.
  • Adds SingleChoiceSegmentedButtonRow for selecting default travel mode (Motorbike / Driving vs Walking).
  • Implements OutlinedTextField inputs for driving and walking watch vibration threshold distances with real-time numeric validation and range hints (10–1000 m).
  • Connects reactive UI state to SettingsViewModel via collectAsStateWithLifecycle() and displays save/error feedback via SnackbarHost.
  • Includes @Preview composables for both Light and Dark theme modes.
• SettingsActivity.kt: Converted from AppCompatActivity with XML ViewBinding to ComponentActivity rendering SettingsScreen within WatchNavigatorTheme.
• SettingsViewModelTest.kt: Added boundary validation and ViewModel factory unit tests.

Verification

• ./gradlew testDebugUnitTest: All unit tests pass cleanly.
• ./gradlew spotlessCheck: Spotless ktlint formatting checks pass.
• make test: Cross-module unit tests (phone & watch) pass 100%.

Closes #42

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 179134a and 412c13a.

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• phone-app/app/src/test/java/com/watchnavigator/ui/SettingsViewModelTest.kt

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[hungify]

Changes and additional boundary tests have been integrated into main via PR #54 and commit 76471fb.