Add AI-powered anomaly explanation system with feedback and UI integr…

[sanctus-mvp]

closes #591

Feature Description

Implemented an AI-powered anomaly explanation system for the Stellar dashboard that generates human-readable, actionable explanations for detected anomalous activity.

What was added

• Interactive explanation panel in the transaction pattern analysis dashboard
• Template-based natural language summaries for anomaly patterns and overall anomaly scores
• Feature importance analysis with top contributing factors and visual bars
• Actionable remediation suggestions and technical context for deeper review
• User feedback capture with helpful/unhelpful ratings, comments, and action tracking
• Local feedback learning to improve future explanation confidence

Benefits

• Makes anomaly flags understandable to non-experts
• Provides context on why activity was flagged
• Encourages user action with clear next steps
• Supports continuous improvement through feedback

Validation

• Added unit tests for explanation generation, feature importance, confidence handling, and feedback integration
• Passed vitest coverage for anomalyExplanation.test.ts

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