feat(dashboard): verification queue page — list pending records with AI scores

[jonesrussell]

Context

Issue #298 landed the AI verification worker. Records are now scored and queued, but there's no UI to review them. The API exists (GET /api/v1/verification/pending).

Requirements

• New Verification Queue page in the dashboard
• Table showing pending records (people + band offices) with columns:
  • Entity type (person / band office)
  • Name or community name
  • AI confidence score (color-coded: green >0.9, yellow 0.5–0.9, red <0.5)
  • Issue count
  • Source URL (link)
  • Created date
• Filter by entity type (all / person / band_office)
• Sort by confidence (lowest first by default — most suspicious on top)
• Pagination (matches API limit/offset)
• Click row to expand detail view (see feat(crawler): add source-manager API client for scraper (#273) #302)

API

GET /api/v1/verification/pending?type=person&limit=50&offset=0

Acceptance Criteria

• Page accessible from dashboard sidebar navigation
• Table loads and displays pending records
• Filter and sort work correctly
• Empty state when no pending records