- Add UnsavedChangesGuard modal (Save/Discard/Cancel) when navigating between tabs
- Wire guard into ModulesPage and SettingsPage with floating action bar
- Implement crash parser and explanation engine in coa-core
- Expose list_crashes Tauri command and CrashItem API
- Add auto-restart on unexpected server crash with crash loop protection
- Add crash counter badge and CrashHistoryModal with human-readable explanations and full crashlogs
- Support all 6 locales (en, ru, de, fr, es, zh)
