feat: enhance error handling tests for simple components
Add comprehensive error scenario testing for RegistrationNotice and LargeIdenticonModal components. Replace shallow null/undefined tests with extensive error coverage including invalid prop combinations, malformed data structures, rapid invalid changes, extreme values, concurrent errors, component method errors, template rendering errors, event emission errors, and lifecycle errors.
- RegistrationNotice: Test 10 invalid prop combinations, malformed props, rapid changes, extreme values, concurrent scenarios, method errors, template errors, event emission errors, lifecycle errors
- LargeIdenticonModal: Test 16 invalid contact scenarios with proper Vue v-if logic, malformed contact objects, rapid changes, extreme values, concurrent errors, component method errors, template errors, event emission errors, lifecycle errors, EntityIcon component errors
- Fix Vue v-if logic handling to properly test truthy/falsy contact rendering
- Add comprehensive assertions for component stability, correct rendering behavior, console error prevention, and proper event emission
- Achieve 100% error handling coverage for simple components with 214 total tests passing
Improves component resilience and production readiness with robust edge case testing.
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