[Test] Add Response Ledger route with action history

[iamasx]

Summary

Add a response-ledger route that shows action history, short outcome summaries, and a compact ownership rail.

Scope

• Add a dedicated response-ledger route.
• Create mock action-history, outcome, and ownership data.
• Build ledger entries, outcome summaries, and an ownership rail.

Acceptance Criteria

• The route renders action history clearly.
• Outcome summaries and ownership details are visible.
• The route remains usable across common breakpoints.
• Tests cover the main route content.