feat: add Reachability Center and Why Drawer components with tests

- Implemented ReachabilityCenterComponent for displaying asset reachability status with summary and filtering options.
- Added ReachabilityWhyDrawerComponent to show detailed reachability evidence and call paths.
- Created unit tests for both components to ensure functionality and correctness.
- Updated accessibility test results for the new components.

docs/api/gateway/samples/orchestrator-packrun-cancel.json

@@ -0,0 +1,7 @@
+{
+  "packRunId": "99999999-9999-9999-9999-999999999999",
+  "status": "canceled",
+  "reason": "Operator requested cancellation.",
+  "canceledAt": "2025-12-12T00:00:00Z",
+  "traceId": "trace-sample"
+}