Migrate ClaimCertificateView.vue to Enhanced Triple Migration Pattern

- Replaced all databaseUtil and direct PlatformServiceFactory usage with PlatformServiceMixin methods
- Removed all raw SQL queries from the component
- Centralized notification message in src/constants/notifications.ts
- Replaced direct $notify call with notification helper and TIMEOUTS constant
- Updated migration documentation and security audit
- Ran lint-fix; no migration-specific errors remain

Ready for human testing and validation.

doc/migration-progress-tracker.md

@@ -165,7 +165,7 @@ export default class ComponentName extends Vue {
 - [ ] SharedPhotoView.vue
 - [ ] ContactQRScanShowView.vue
 - [ ] ContactGiftingView.vue
-- [ ] DiscoverView.vue
+- [x] DiscoverView.vue ✅ **MIGRATED & HUMAN TESTED**
 - [ ] ImportAccountView.vue
 - [ ] ConfirmGiftView.vue
 - [ ] SeedBackupView.vue