fix: sanitize history errors and localize engine notifications

[emi-ran]

Summary

• sanitize execution-history messages, arguments, rule names, and trigger snapshots before persistence or legacy migration
• replace raw executor and dispatcher exception text with stable safe outcomes
• apply persisted app locale before background notifications and refresh engine/failure channels, notification text, and widget state after language changes

Verification

• python scripts/test_lint_resource_contracts.py
• python scripts/test_locale_contracts.py
• ./gradlew.bat testDebugUnitTest lintDebug assembleDebug assembleRelease -PreleaseSigningRequired=false

Manual validation

• Debug APK was built but no ADB device was connected for install/launch and Android 12/13+ locale restart smoke checks.

Closes #19
Closes #23