feat: auto-close live charge screen when charging stops

[vide]

Summary

Automatically closes the live charge screen and navigates back to the previous screen when the car stops charging. Since the live screen is designed for real-time updates, once charging completes, the charge is immediately available in the charges list and the live view is no longer needed.

Implementation

• Added state tracking in CurrentChargeScreen to detect charging transitions
• Uses LaunchedEffect to monitor isNotCharging flag changes
• Triggers automatic navigation via onNavigateBack() when charging stops
• Preserves existing fallback behavior when opening screen with no active charge

Key Files Modified

• app/src/main/java/com/matedroid/ui/screens/charges/CurrentChargeScreen.kt
• CHANGELOG.md

Behavior

Automatic close triggers when:

• User is viewing the live charge screen
• Car stops charging (detected via API polling every 30s)
• Screen automatically navigates back

No automatic close when:

• Screen is opened when car is already not charging (shows fallback message)
• Charging resumes after stopping

Test Plan

• Lint passed: ./gradlew lintDebug
• Unit tests passed: ./gradlew testDebugUnitTest
• Manual testing with real charging session
  • Start charging and open live screen
  • Stop charging (unplug or reach limit)
  • Verify screen auto-closes within 30 seconds
• Edge case: Open screen when not charging (should show fallback, not auto-close)

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