feat(notification): real-time charging live updates + zh-CN follow-up

[gehbfarr5]

Summary

• improve real-time charging notification UI/content (SOC progress, ETA, power/voltage/current, speed, added range)
• add a debug toggle to preview charging live notifications without an active charge
• include zh-CN checklist/doc update and new notification strings used by live charging updates
• align new string keys across it/es/ca locales for localization completeness
• fix SettingsViewModelTest constructor wiring after injecting ChargingNotificationManager

Files of interest

• app/src/main/java/com/matedroid/notification/ChargingNotificationManager.kt
• app/src/main/java/com/matedroid/service/ChargingMonitorService.kt
• app/src/main/java/com/matedroid/ui/screens/settings/SettingsScreen.kt
• app/src/main/java/com/matedroid/ui/screens/settings/SettingsViewModel.kt
• app/src/main/res/values*/strings.xml
• app/src/test/java/com/matedroid/ui/screens/settings/SettingsViewModelTest.kt
• docs/LOCALIZATION_ZH_CN_CHECKLIST.md

Validation

• ./gradlew --no-daemon :app:compileDebugUnitTestKotlin
• full lint/build/test will run in CI on this PR

[gehbfarr5]

Closing this combined PR in favor of split PRs:\n- Notification: #213\n- Chinese docs/checklist: #214