Scope checkpoint diff cache keys to avoid collisions

- Include `cacheScope` in checkpoint diff query keys
- Pass turn/conversation-specific scopes from `ChatView` and `DiffPanel`
- Add tests for key separation and API argument forwarding
6aea858ed8Julius Marminge committed on 2/19/2026, 5:59:17 AM· committed by Julius Marmingeparentf07b6ac
4 files changedLine totals unavailable