feat(ops-ui): enhance claim detail placeholder with summary stats and navigation

[AAdewunmi]

Summary

Enhances the Ops claim detail placeholder page with lightweight, practical UI improvements to make it more useful during Day 2 development.

What changed

• Updated policylens/apps/ops/templates/ops/claim_detail.html:
  • Added a back link to the queue (ops:queue).
  • Added header badges for claim priority and status.
  • Added summary stat cards for:
    • documents
    • notes
    • decisions
    • audit events
  • Expanded detail block with:
    • policy number
    • policy holder name
    • created timestamp
    • claim summary fallback

Why

• Makes the placeholder detail page more operationally informative without introducing heavy workflow logic.
• Improves navigation and readability while full claim-detail functionality is still in progress.

Validation

• Ran targeted smoke tests:
  • tests/test_ops_smoke.py
  • Result: passing (5 passed)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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