- Add is_likely_wrong_person and wrong_person_reason fields to MatchCandidate
- Add confidence_original field for tracking pre-adjustment scores
- Add visual indicators: AlertTriangle for wrong person, Star for high confidence
- Add filter checkboxes: 'Show high confidence (>80%)' and 'Hide wrong person'
- Add wrong person alert banner with bilingual labels (NL/EN)
- Add danger stat card showing count of likely wrong person matches
- Style signal badges by type: danger (birth_year_mismatch), success (validated)
- Add extensive CSS for wrong-person/high-confidence alerts and candidate styling