feat: sentry event detection & notification

[vide]

Summary

• Detect sentry mode alert events (center_display_state == "7") via the existing ChargingNotificationWorker (30s polling) — no dedicated foreground service needed
• Fire heads-up notifications on a dedicated IMPORTANCE_HIGH "Sentry Alerts" channel with 65s debounce on alerting (matches the 1-minute screen-on duration per real event)
• Show a running event counter next to the sentry red dot on both the dashboard and the home screen widget
• Counter resets automatically when sentry mode turns off
• Notification channel created eagerly at app startup so users can configure it in Android settings before any event fires
• Debug builds include a "Simulate Sentry Event" button in Settings

New files

• SentryStateDataStore — Preferences DataStore for per-car event persistence
• SentryStateRepository — Business logic (65s notification debounce, session lifecycle, event counting)
• SentryNotificationManager — IMPORTANCE_HIGH channel, heads-up alerts with silent counter updates

Modified files

• CarModels.kt — Added centerDisplayState field + isSentryAlerted accessor
• ChargingNotificationWorker.kt — Sentry detection in per-car check loop, polling unified to 30s
• MateDroidApp.kt — Eager sentry channel creation at startup
• DashboardViewModel/Screen — Sentry event count in UI state + red count text next to dot
• CarWidget/DisplayData/UpdateWorker — Sentry count in widget preferences + drawn next to dot
• SettingsViewModel/Screen — Debug "Simulate Sentry Event" button
• AndroidManifest.xml — No new services (sentry runs in existing worker)
• String resources in all 4 locales (en, it, es, ca)
• Both ViewModel test files updated for new dependencies

Test plan

• ./gradlew testDebugUnitTest — passes
• ./gradlew lintDebug — no hardcoded strings
• ./gradlew assembleDebug — builds successfully
• Manual: debug simulate button fires notification and increments counter
• Manual: tested with real car — sentry events detected and notified
• Manual: verify counter resets when sentry mode turns off

🤖 Generated with Claude Code